ADTRAN
ADTN
#7215
Rank
โ‚ฌ0.54 B
Marketcap
6,68ย โ‚ฌ
Share price
-3.48%
Change (1 day)
-14.53%
Change (1 year)
Text size:
SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 10-K

FOR ANNUAL AND TRANSITION REPORTS
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 2001

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the Transition Period from ___ to ___

Commission file number 0-24612

ADTRAN, Inc.
(Exact name of registrant as specified in its charter)

Delaware 63-0918200
(State of Incorporation) (I.R.S.Employer
(Identification Number)

901 Explorer Boulevard, Huntsville, Alabama 35806-2807
(Address of principal executive offices, including zip code)

(256) 963-8000
(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act:
Common Stock, $.01 par value

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes [X] No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of the registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [X]

The aggregate market value of the registrant's outstanding common stock held by
non-affiliates of the registrant on March 1, 2002 was $537,763,390 based on a
closing market price of $25.40 as quoted on the Nasdaq National Market. There
were 39,197,322 shares of common stock outstanding as of March 1, 2002.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for the Annual Meeting of Stockholders to be
held on April 16, 2002 are incorporated herein by reference in Part III.
ADTRAN, Inc.
Annual Report on Form 10-K
For the Fiscal Year Ended December 31, 2001

Table of Contents
-----------------

<TABLE>
<CAPTION>
Item Page
Number Number
PART I

<S> <C> <C>
1. Business.......................................................................................1

2. Properties....................................................................................12

3. Legal Proceedings.............................................................................12

4. Submission of Matters to a Vote of Security Holders...........................................13

4A. Executive Officers of the Registrant..........................................................13

PART II

5. Market for the Registrant's Common Equity and Related Stockholder Matters.....................15

6. Selected Financial Data.......................................................................16

7. Management's Discussion and Analysis of Financial Condition and Results of Operations.........17

7A. Quantitative and Qualitative Disclosures About Market Risk....................................21

8. Financial Statements and Supplementary Data...................................................21

9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure..........37

PART III

10. Directors and Executive Officers of the Registrant............................................37

11. Executive Compensation........................................................................37

12. Security Ownership of Certain Beneficial Owners and Management................................37

13. Certain Relationships and Related Transactions................................................37

PART IV

14. Exhibits, Financial Statements, Financial Statement Schedules, and Reports on Form 8-K.......38

SIGNATURES...............................40

INDEX OF EXHIBITS...............................42
</TABLE>

-i-
PART I

ITEM 1. BUSINESS
- --------------------------------------------------------------------------------

OVERVIEW

ADTRAN, Inc. designs, develops, manufactures, markets and services a broad range
of high-speed network access products utilized by providers of
telecommunications services (serviced by ADTRAN's Carrier Networks division or
CN) and corporate end-users (serviced by ADTRAN's Enterprise Networks division
or EN) to implement advanced digital data services over public and private
networks. These customers use our products to implement high-speed voice and
data communications over copper and fiber network infrastructures. Our company
was incorporated under the laws of Delaware in November 1985 and commenced
operations in January 1986.

Customers. Our Carrier Networks customers include all of the major domestic
Incumbent Local Exchange Carriers (ILECs); large independent carriers; a growing
number of successful Competitive Service Providers (CSPs); as well as primary
telecom service providers and competitive carriers in other regions of the
world. Our global markets include China, Europe, Canada, Latin America and
Australia. Our Enterprise Networks customers include private and public
enterprises worldwide in numerous vertical industries. We market our products
and services using a direct sales force complemented by an extensive network of
technology distributors and resellers.

Products. We offer more than 500 products built around a set of core
technologies, and developed to address high-speed digital communications over
the last mile of the Local Loop. The Local Loop is the large existing
infrastructure of the telephone network that connects end users to a service
provider's Central Office, the facility that provides the local switching and
distribution functions. The Local Loop consists of both fiber and copper
wireline, although it is predominantly copper. Our technologies are deployed in
over three million Local Loops worldwide.

Our products address two market segments: (i) CN products for use in the service
provider's Local Loop, including Central Office, remote terminal and customer
premises, and (ii) EN products for use at enterprise headquarters, remote
offices and telecommuting locations. Our business is arranged with two
divisions, the Carrier Networks and Enterprise Networks divisions, to enable us
to quickly respond to the needs of these two important market segments. In 2001,
sales of CN products accounted for 62% of revenue, and EN products accounted for
38%.

The main product lines for the CN division include the Total Access(R) System
and HDSL/HDSL2/HDSL4 transport technologies. The Total Access System is a
distributed access solution that includes broadband and narrowband access
platforms, outside plant access terminals, voice concentrators, and system
management and professional services. Our HDSL/HDSL2/HDSL4 products offer
four-wire and two-wire transport of voice and data over T1 facilities at
extended distances with less engineering. These products are in addition to a
comprehensive line of plug-in transmission, repeater, extension and termination
devices for T1, Frame Relay, Integrated Services Digital Network (ISDN) and
Digital Data Service (DDS) services.

The EN division provides product line solutions for wide area connectivity
across today's diverse communications networks and technologies. We sell a broad
range of products for voice, data, video, and Internet applications across
fiber, T3, T1, E1, wireless T1/E1, ATM, Frame Relay, SHDSL, Virtual Private
Network (VPN), SDSL, HDSL, HDSL2, ISDN and DDS. Key product lines include the
ATLAS(TM) Series of Integrated Access Devices, the NetVanta(TM) Series of VPN
networking devices, the TSU series of T1 Services Units, the IQ(TM) Series of
Frame Relay Performance Monitoring devices, the ISU Series of ISDN Service
Units, the TRACER Series of wireless products and the DSU Series of DDS Service
Units.

Market Trends. Demand for both CN and EN products is being driven by Internet
access, Small Office/Home Office (SOHO) users, video delivery, on-line data
services, and other applications. All of these require the speed, reliability
and low cost of digital transmission. Some service providers have begun efforts
to replace the copper wireline network between Central Offices with a means for
high-speed digital transmission. However, due to the huge investment required to
replace copper in the Local Loop, it remains predominantly copper wireline. This
situation has created a great opportunity for our company because we develop
products that enable the Local Loop to provide digital transmission using
existing copper.

Additionally, demand for newer digital delivery technologies has resulted in
expansion of our product lines. These technologies are experiencing rapid
growth, including High-Bit-Rate Digital Subscriber Line (HDSL), Symmetrical
High-Bit-Rate Digital Subscriber Line, also known as SHDSL, Asymmetrical
High-Bit-Rate Digital Subscriber Line (ADSL) and ATM. Numerous higher-speed
digital technologies are under development, including additional versions of
DSL, and solutions for serving the last mile using fiber access products.

Product Development Strategy. Our core competency lies in our expertise in the
development of advanced digital transmission and network access technology.
Historically, we have designed products to increase transmission speeds, extend
distances, and optimize the capacity of the existing infrastructure. Continuing
this tradition, our current product development includes the creation of
products that are systems-based and support higher speed digital technologies in
comprehensive packaged solutions.

For example, we are now producing the Total Access System - a distributed access
solution that includes carrier-class broadband and narrowband multiservice
access platforms, TDM- and ATM-based Integrated Access Devices (IADs), and
GR-303 concentrators. Total Access promotes strategic network planning and
leverages customer investment with the latest copper-saving technologies. This
product line also includes system management and professional services.

In developing our product families, we have continuously improved our design,
purchasing and production processes to lower product costs. This results in our
ability to provide improved products at lower prices to our customers.
Therefore, we believe we are a leading provider of Local Loop and Central Office
digital transmission products to services providers.

The innovative signaling technique used in Total Reach(R) has enabled us to
sustain a strong price and performance advantage. We pioneered the use of
narrowband two-wire technologies in the mid-1990's with our Total Reach DDS and
ISDN range extension products. Still in high demand, Total Reach products
contributed approximately 11% to 2001 revenue. That signaling technique has been
modified and adopted for newer T1 transports, such as HDSL2, SHDSL, and HDSL4.
As a result, HDSL2 is the first two-wire standard for T1 facilities. We were the
first to market with a standards-compliant product in late 1999. That product
began shipping in volume in 2000.

We are leading the industry's newest DSL technology, SHDSL. We were one of the
first to develop a standards-compliant SHDSL chip, and the first to introduce a
SHDSL deployment solution using the Total Access System. SHDSL has strong
implications in international markets as well. Standardized by both U.S. and
international committees, SHDSL represents the first true global symmetric
DSL standard.

Continuing the tradition as the industry leader, we are significantly
diversifying our product lines. We are currently developing products to satisfy
emerging demand for Internet Protocol (IP) and softswitch network architectures.
New products under development include VPN tunneling devices and traffic shaping
devices.

BUSINESS STRATEGY

Our business objective is to enhance our position as a leading provider of
digital transmission products for the Local Loop with a strategic focus on
network access. To achieve this objective, we have adopted the following
strategies:

Expand Product Offerings. We are expanding our product line to offer our
customers more comprehensive systems solutions and a migration path from
circuit-switched technologies to next-generation packet-switched technologies.
We are also offering products focused on addressing the challenges brought about
by a competitive service environment.

. We are continuing to develop the Total Access System. A complete solution
ranging from planning to professional services, Total Access enables
carriers to work with a single vendor for integrated services. This systems
approach offers advantages such as flexible services, more network
interface options, increased bandwidth, centralized network management,
voice and data convergence, single-vendor support and training, and easier
technology migration.

. We have expanded into new product areas that allow carriers to handle both
analog and digital traffic. This enables them to migrate the Local Loop
from analog to digital without additional capital expenditure.

. We are also continuing to develop new products that address the needs of
the competitive service environment. As deregulation occurs, and new
players continually enter the arena, service providers must manage
ever-increasing network traffic, while keeping associated costs in check.
Our solutions in this area include products to converge voice and data onto
common circuits, such as Digital Subscriber Line Access Multiplexers
(DSLAMs) and IADs. Both of these devices play an important part in the
deployment of Voice over DSL and other next-generation voice and data
transports. Other products address the migration from four-wire to two-wire
networks-a technique many carriers are using to capitalize on existing
copper in both narrowband and broadband applications.

2
Capitalize on Existing Market Leadership Positions. We intend to maintain our
market leadership positions in both Carrier and Enterprise markets. Our
dedicated engineering organization focuses on applying successful technologies
to new applications, and on developing new technologies to meet emerging market
trends. Through in-house silicon development and engineering efficiency, we have
consistently improved product performance while reducing costs, leading to gains
in market share. We will continue to develop innovative new products, and
redesign existing products in order to reduce costs and cycle times. By focusing
on these efforts, we believe we will continue to be a leading low-cost provider
to the industry. We believe that maintaining our leadership in technology for
high-speed digital transmission over copper wire is critical to our ability to
build and maintain strong relationships with incumbent and competitive carriers,
as well as enterprise users, and to achieve leadership in new markets.

Expand Sales Channels to Drive Market Penetration. We are working to increase
customer adoption of our products by enhancing the capabilities of both our
direct and indirect sales force. By reinforcing the existing strong channels we
have today and with the introduction of new international channels, we expect to
develop new markets and increase market penetration in existing markets in the
coming year.

PRODUCTS

CN Products. Systems solutions and DSL technologies make up the core of our CN
product offering. We are the industry's leading HDSL/HDSL2 product supplier,
with equipment in use by a majority of ILECs and numerous other service
providers. We are also a leader in the development of the next generation of DSL
transport products, known as SHDSL and HDSL4. Having assumed a leadership role
with the governing standards bodies that defined these important advancements,
our in-depth understanding of these technologies enabled us to produce the
industry's first SHDSL chip set in a joint development effort with Infineon
Technologies AG and to achieve volume production with the world's first HDSL4
chip in the fourth quarter of 2001. These products are vital to carriers who
deploy them widely to service business users needing broadband connectivity.

We were the first equipment provider to develop our own low-cost chip sets
implementing HDSL2 and SHDSL. We believe we are still the sole equipment
provider to do so. We believe this is a sustainable competitive advantage moving
forward. Our engineers continue to provide timely technical advances through
their effective development process, and our in-house integrated circuit
expertise allows us to deliver highly competitive products with industry-leading
cost positions.

Our Total Access System provides a powerful broadband solution for carrier
networks. It includes critical equipment that connects expensive network
infrastructure to the revenue source. Our Total Access System product line was
strengthened in 2001 by the announcement of significant additions. Each addition
plays a strategic role in the deployment of today's efficient distributed access
business mode. They address strong demand for new capabilities in Local Loop
access platforms, serving Digital Loop Carrier (DLC) systems, DSLAM's voice
concentrators, fiber distribution platforms, Voice over DSL deployment systems,
and centralized network management systems. These and other high-growth
applications will continue to drive sales of the Total Access System. Installed
at the Central Office or in a remote terminal, Total Access connects to network
backbones ranging from T1 to fiber, and enables deployment of the widest range
of voice and data services.

In 2001, we released a complementary fiber-based product within the Total Access
System focused on the last mile of the Local Loop, the Total Access OPTI-3. The
latest addition to the Total Access System product line, OPTI-3 is a
cost-effective, fiber-based DS3 delivery solution. The OPTI-3 is approximately
one-half the price and one-fourth the size of the traditional SONET ADM
equipment currently used for these service offerings.

Our Total Reach family of products uses our technology to extend digital
services over one twisted pair of copper wires. Total Reach addresses some of
the major challenges associated with 64 kilobits per second Frame Relay service
deployment. These problems include copper pair availability, extensive
engineering for repeaters, and apparatus cases required for lengthy installs,
bridged tap determination and removal efforts, and power requirements.

EN Products. Many of our original EN products evolved from technologies
developed for our CN product lines. Today, some of the technologies being
developed by our EN division have application in CN markets as well. Frequently,
we are able to realize a competitive advantage in the marketplace by leveraging
product development efforts and expertise across our two divisions. Our goal is
to deliver customer premises-based Wide Area Network (WAN) Access solutions for
small and medium businesses around the world.

The products we produce provide connectivity over all popular topologies at a
variety of rates. Access speeds supported include 56/64K, T1, E1, T3, fiber and
wireless. Product solutions range from simple CSUs (Channel Service Units) and
CSU/DSUs (Data Service Units), to IADs, routers, multiplexers and other product
types, all designed to connect the user's equipment - telephones, PBX's,
routers, LAN-based equipment, video-conferencing gear, etc. - to the wide area
network. Functionality ranges from low-cost, unmanaged devices to modular,
remotely-manageable devices. A variety of dial backup options are offered on a
number of platforms.

3
The ATLAS Series, introduced in late 1997, has proven effective as a central
site solution for the enterprise dealing with remote connectivity issues
involving one or more different types of service technologies. A single ATLAS
device can handle voice, data and video signals, and is often used to
consolidate traffic and reduce monthly telecommunications costs. An ATLAS unit,
combined with one of our access devices at the remote end, provides a complete
connectivity solution for virtually any enterprise network.

The ATLAS Series now includes the 550, 800, 800 PLUS, 810 PLUS (multinational)
and 890. Members of the ATLAS Series are classified as IADs, and essentially
function as bandwidth managers, ISDN access switches, remote access
concentrators, digital cross-connect systems, wide area emulators, routers, dial
backup solutions and Frame Relay switches, all in one. The ATLAS 550, a
lower-cost, lower-capacity version of the ATLAS 800, is a mid-sized platform for
migrating TDM-based networks to packet technologies such as voice over IP and
ATM.

The IAD is an essential component in converged network architectures, especially
in Voice over DSL applications. To address this growing need, we have added the
Total Access Series of IADs to our EN product lineup. The typical Voice over DSL
model requires interoperability between an IAD, voice gateway, and DSLAM. We
have established interoperability with leading third-party voice gateways and
DSLAMs, making Total Access IADs suitable for many network opportunities,
including existing circuit-switched networks and newer packet-based networks.
Many carriers and enterprise customers are updating the last-mile segment of
their networks from narrowband technologies, such as DDS, ISDN, and T1, to
broadband technologies such as T3 and fiber. We have enjoyed consistent success
in the T3 enterprise market since the introduction of the T3SU 300(TM)
termination device in 1998. Its innovative design ended the limitations found in
many T3 termination devices; therefore, the T3SU 300 gained rapid market
acceptance.

In late 2000, we entered the enterprise fiber market with two new optical
transport products. The OCU 45(TM) (Optical Converter Unit) is used in
applications where the customer seeks to connect copper-based buildings to
fiber. The OSU 300(TM), also introduced late in 2000, is a competitively priced
Optical Service Unit for terminating point-to-point fiber circuits. Built on the
technologies of our highly successful T3SU 300, the OSU 300 handles both voice
and data using a single device, eliminating excess equipment.

As the acknowledged market leader in CSU/DSUs for four consecutive years, we
continue to provide a strong, broad offering of products in this important
marketplace. Our first entry into this market was in 1997 when we introduced our
IQ(TM) Series of DSUs and CSUs. The IQ Series allows network operators and
service providers to monitor and ensure the quality of service delivered on
Frame Relay circuits. In 2001, we enhanced the IQ Series with the introduction
of the IQ 710. The IQ 710 monitors performance on Frame Relay circuits up
through the application layer, classifying bandwidth consumption by specific
users and applications.

Anticipating acceptance of IP based VPNs for corporate connectivity, we
introduced the NetVanta 2000 Series of VPN/Firewall solutions in 2001. With
individual products optimized for the mobile worker, remote office, and regional
office/corporate headquarters, the NetVanta Series allows for secure
communications over the Internet.

INTERNATIONAL MARKETS

We serve our international markets through a combination of direct sales and
distribution arrangements. We have formed, and will continue to pursue,
international distribution arrangements built upon core products and
technologies developed in an effort to further our penetration into global
markets.

While our complete line of international E1 and four-wire HDSL deployment
products continue to constitute a large portion of our international sales, many
of the domestic product advances made in 2001 have important implications for
global markets. Two-wire transport that stretches infrastructure, fiber optics
that increase bandwidth, and end-to-end system applications are in high demand
in other countries, just as they are in the United States. The new two-wire
SHDSL international transport standard is being rapidly accepted abroad.

The international version of the Total Access System offers global service
providers many of the same powerful deployment options that United States
carriers enjoy. The Total Access System provides full end-to-end solutions
including management and control of many network elements from the Central
Office to the terminating device at the customer premises. With a single
platform to support both international and domestic customers, we should see
greater economy of scale in the future, resulting in improved price and
performance. Our international market potential is in the beginning stages of
development and related sales are modest. See Note 9 to Notes to Financial
Statements for sales information by geographic region.

4
RESEARCH AND PRODUCT DEVELOPMENT

Rapidly changing technology, evolving industry standards, and continuing
improvement in telecommunications service offerings by common carriers
characterize the markets for our products. Our continued ability to adapt to
these changes and develop new and enhanced products is a significant factor in
maintaining or improving our competitive position and our prospects for growth.
Therefore, we continue to make significant investments in product development.

As of December 31, 2001, 376 engineers and engineering support personnel,
comprising approximately 23% of our employees, carried out our product
development programs. To date, all product development expenses have been
charged to operations as incurred. From time to time, other firms under contract
conduct development programs with us, and related costs are also charged to
operations as incurred. During 2001, 2000 and 1999, product development
expenditures totaled $58,935,000, $50,628,000, and $42,018,000, respectively.
Because our product development activities are an important part of our strategy
and because of rapidly changing technology and evolving industry standards, we
expect to spend more in product development activities in 2002 than we did in
2001.

Our product development group is organized into teams, each of which is
effectively dedicated to a specific product line or lines. However, because we
service each of the CN and EN markets, and because all of the products in each
of the markets share certain similarities, the benefits of our product
development efforts generally are not confined to a particular market, but can
be leveraged to our advantage in all of our markets.

As of December 31, 2001, product development teams were assigned to the
following product lines: CN Loop Technologies (DDS, ISDN, Total Reach DDS and
ISDN, FT1, T1, E1, SHDSL, HDSL, HDSL2, HDSL4, ADSL, DS3 including M13
multiplexers and DS3 NIU, and PC board layout); CN Access Platforms (includes
teams for Total Access DSLAM, Total Access EMS, Total Access Digital Loop
Carrier and TDM Applications, Total Access Circuit to Packet Products, Total
Access Optical Products, Mechanical Systems and Power Supplies) and EN
Connectivity (includes teams for IADs, Packet Access Products, TDM Access
Products, Fixed Broadband Wireless Products, Fiber Optic Products and
International Products).

Engineering services and advanced technology groups provide support for all of
the product development teams. Each team is generally responsible for sustaining
technical support of existing products, improving the cost of manufacturing of
products, conceiving new products in cooperation with other groups within our
organization, and adapting standard products or technology under supply
contracts to other firms.

In particular, each product development team is charged with implementing our
engineering strategy of reducing product costs for each succeeding generation of
our products in an effort to be a low-cost, high-quality provider in the
industry, without compromising functionality or serviceability. This strategy
has involved setting a price point for the next generation of any given product
with the aim of meeting that price point through innovative engineering.

The key to this strategy is choosing an initial architecture for each product
that enables engineering innovations to result in future cost reductions.
Successful execution of this strategy also requires that we continue to attract
and recruit outstanding engineers. The continued success of our employee
recruiting program at universities throughout the Southeastern United States is
critical to this effort.

The product development teams are supported by a research group that provides
guidance in applicable digital signal processing technologies, computer
simulation and modeling, CAD/CAM tool sets, custom semiconductor design and
technological forecasting. As product and market opportunities arise, our
organizational structure may be adjusted accordingly. Our development process is
conducted in accordance with ISO 9001 and TL 9000, which are the international
standards for quality management systems for design, manufacturing and service.

We believe that our success in the past has been dependent upon the ability of
our engineering team to establish and maintain a position of product and
technological leadership. Our success in the future will be equally dependent
upon the evolution of new forms of existing products and the development of new
products fulfilling the needs of current and future customers. Therefore, we
will continue to make significant investments in product development.

CUSTOMERS

Our carrier customer base includes all of the major domestic ILECs, large
independent carriers, a growing number of successful CSPs, as well as primary
telecom service providers and competitive carriers in other regions of the
world. These regions include: China, Europe, Canada, Latin America and
Australia. Our enterprise customer base includes private and public enterprises
worldwide in numerous vertical industries.

5
The major customers of ADTRAN include the following:

Alltel Corporation Ingram Micro, Inc. SBC Communications, Inc.
AT&T Corp. WorldCom, Inc. Sprint Corporation
BellSouth Corporation Qwest Communications Tech Data Corporation
Cisco Systems, Inc. International, Inc. Verizon Communications, Inc.

Historically, a large percentage of our sales (typically more than 50%) have
been made to the Regional Bell Operating Companies (RBOCs) and major independent
carriers. While these customers still comprise a large percent of our revenue
source (59% in 2001), recent mergers and acquisitions have affected the mix.
Verizon Communications, Inc. constituted approximately 19% of our revenue base
in 2001. SBC Communications, Inc. accounted for 20% and Sprint Corporation
accounted for 10% of our total sales in 2001. No other customer accounted for
10% or more of our sales in 2001.

Product approval must be obtained prior to selling products to RBOCs and other
carriers. Therefore, we are involved in a constant process of submitting
succeeding generations of products for approval. We must also submit products
that deploy new technology or respond to a new technology demand from an RBOC or
other carrier. We have been successful in the past in obtaining such approvals.
However, we can not be certain that we will obtain such approvals in the future
or that sales of such products will continue to occur. Further, any attempt by
an RBOC or other carrier to seek out additional or alternative suppliers or to
undertake, as permitted under applicable regulations, the production of such
products internally could have a material adverse effect on our operating
results.

MARKETING, SALES AND DISTRIBUTION

As of December 31, 2001, our marketing and sales programs were conducted by 275
employees. We sell CN products in the United States both indirectly and directly
to the carriers through a field sales organization based in 39 locations in the
United States. CN products are also sold in Canada through a subsidiary based in
Montreal. The CN products are sold internationally through field sales offices
and various distribution arrangements with a geographically dispersed set of
distributors. The EN products, both domestically and internationally, are sold
through a two-tiered network of distributors and resellers.

We have formed, and will continue to pursue, international distribution
arrangements built upon core products and technologies we developed in an effort
to further our penetration into international markets. Although the
international market channel has not yet been fully developed and related
revenue has been modest, we believe international markets present a significant
opportunity for growth, and we continue to focus effort on positioning our
company to take advantage of such opportunities.

Sales to carriers involve protracted lengthy product qualification and
standardization processes that can extend for several months or years.
Subsequent orders, if any, are typically placed under single or multi-year
supply agreements that are generally not subject to minimum volume commitments.
Carriers generally prefer having two or more suppliers of most products, so
individual orders are generally subject to competition based on some combination
of total value, service, price, delivery and other terms. EN products are sold
under non-exclusive distribution arrangements.

Our field sales organizations and distributors receive support from
headquarters-based marketing, sales, and customer support groups. Under certain
circumstances, other headquarters personnel may become involved in sales and
other activities. We believe that our success in the past has been dependent to
a significant degree upon the ability of our sales and distribution teams to
compete effectively in a highly competitive environment that includes firms with
greater financial resources and more experience than us. Our success in the
future will depend in part upon our ability to attract and retain qualified
sales and marketing personnel who can compete and succeed in this environment.

CUSTOMER SERVICE AND SUPPORT

We provide free telephone support during business hours, with emergency support
available 24 hours-a-day, 7 days-a-week. Customers often demand an immediate
response to problems with installed products or with plans for new
installations. We provide on-site support in those circumstances where problems
cannot otherwise be resolved. Our policy has generally been to follow through
with problem resolutions even after it is established that our products are not
the source of the difficulty. We provide direct installation and service of our
products in North America utilizing our own resources or resources available
under nationwide services contracts with VITAL Network Services for installation
and service.

All of our products carry either a five or ten-year return-to-factory warranty.
To date, warranty returns have been relatively insignificant (less than 1%). We
believe that our low return rate is a direct result of our commitment to a
rigorous product quality program. This program has garnered us special
recognition by several key customers.

6
MANUFACTURING

The principal steps in the manufacturing process are the purchase and management
of materials, assembly, testing, final inspection, packing and shipping. In
2001, we continued to purchase parts and components for the assembly of some
products from a large number of suppliers through a worldwide sourcing program.
In addition, we have begun to shift to a process of allowing contract
manufacturers to purchase the materials that they use in the assembly of our
products. Certain key components used in our products are currently available
from only one source, and other key components are available from only a limited
number of sources. In the past, we have experienced delays in the receipt of
certain of our key components, which have resulted in delays in related product
deliveries. We attempt to manage such risks through developing alternative
sources, through engineering efforts designed to obviate the necessity of
certain components, and by maintaining quality relationships and close personal
contact with each of our suppliers.

We rely on subcontractors in the United States, Mexico, and China for assembly
of printed circuit board assemblies, sub-assemblies, chassis, enclosures and
equipment shelves, and, more recently, also to purchase the raw materials used
in and for such assembly. During 2001, we transitioned our manufacturing of low
volume, high mix, or complex printed circuit board assemblies to our
manufacturing site in Huntsville, Alabama. We continue to build and test all new
product prototypes and initial production units for all products in Huntsville,
transferring the high volume, low mix printed circuit assemblies to our
subcontractors. We plan to continue to transition the purchasing of materials
for assembly and final testing of a significant portion of our lower priced
products to companies in Mexico or China with which we subcontract. Such
assembly typically can be done by subcontractors at an equal or lower cost than
if we assembled such items internally, which furthers our goal of being a low
cost, high quality provider in the industry. Subcontract assembly operations do,
however, contribute significantly to production cycle times, but we believe we
can respond more rapidly to uncertainties in incoming order rates by selecting
assembly subcontractors having significant reserve capacity. We have
consolidated our subcontractors to a few whose proven flexibility and quality
meet our requirements. This reliance on third-party subcontractors for the
assembly of our products involves several risks, including the unavailability of
or interruptions in access to certain process technologies and reduced control
over product quality, delivery schedules, manufacturing yields and costs. These
risks may be exacerbated by economic or political uncertainties or by natural
disasters in foreign countries in which our subcontractors may be located. We
currently have limited foreign exchange risks as we conduct the majority of all
transactions with foreign vendors or customers in United States dollars.

Shipment of products to customers occurs in our facilities in Huntsville,
Alabama. Our facilities are certified pursuant to ISO 9001, TL 9000 and certain
other telephone company standards, including those relating to emission of
electromagnetic energy and safety specifications.

BACKLOG AND INVENTORY

A substantial portion of our shipments in any fiscal period relate to orders
received in that fiscal period and firm purchase orders released in that fiscal
period by customers under agreements containing non-binding purchase
commitments. Further, a significant percentage of orders require delivery within
48 hours. These factors result in very little order backlog. We believe that
because a substantial portion of customer orders are filled within the fiscal
quarter of receipt, our backlog is not a meaningful indicator of actual sales
for any succeeding period. To meet this demand, we maintain a substantial
finished goods inventory.

Our practice of maintaining sufficient inventory levels to assure prompt
delivery of our products increases the amount of inventory that may become
obsolete. The obsolescence of such inventory may cause us to have to write down
the value of the obsolete inventory, which would have an adverse effect on our
operating results.

COMPETITION

The markets for ADTRAN's products are intensely competitive. With the
development of the worldwide communications market and the growing demand for
related equipment, additional manufacturers have entered the markets in recent
years to offer products in competition with us. Additionally, certain companies
have, in recent years, developed the ability to deliver fiber-optic cable,
coaxial cable and wireless transmission to certain office centers and other
end-users. Competition would further increase if new companies enter the market
or existing competitors expand their product lines. For instance, legislation
has been enacted that lifts the restrictions that previously prevented the RBOCs
from manufacturing telecommunications equipment. The RBOCs, which in the
aggregate are our largest customers, may increasingly become our competitors in
the markets that we share.

With respect to CN sales, product quality and availability and an established
reputation for customer service are important competitive factors that can
affect our ability to have our products accepted and approved by the individual
carriers. Our CN market competitors include large established firms such as ADC
Telecommunications, Inc., Lucent Technologies, Inc., Nortel Networks
Corporation, Tellabs, Inc., Westell Technologies, Inc., as well as smaller,
specialized firms.

7
In the EN market, among the significant competitors for 56/64K network access
products, otherwise known as subrate CSU/DSU products, are General DataComm
Industries, Inc. and Motorola, Inc. Competitors for T1 service unit market share
include ADC KENTROX, a subsidiary of ADC Telecommunications, Inc., Paradyne
Corp., Quick Eagle Corporation, and Visual Networks, Inc. ADTRAN now holds a
leading market share position in IADs, where we compete with ACT Networks and
Zhone Technologies, Inc. (formerly Premisys). In broadband T3 and fiber markets,
competition varies greatly by product, but includes Carrier Access Corporation,
Quick Eagle Corporation, and Canoga Perkins Corporation. An increase in
competition could reduce our gross profit margins and may require increased
spending by us on product development and sales and marketing.

PROPRIETARY RIGHTS

The name "ADTRAN" and our corporate logo are registered trademarks of ADTRAN. A
number of our product identifiers and names are also registered. We also claim
rights to a number of unregistered trademarks. We have ownership of at least 68
patents related to our products and have additional patents pending. We will
continue to seek additional patents from time to time related to our research
and development activities. We do not derive any material amount of revenue from
the licensing of our patents. We protect our intellectual property and
proprietary rights in accordance with good legal and business practice. We
believe, however, that our competitive success will not depend on the ownership
of intellectual property, but primarily on the innovative skills, technical
competence and marketing abilities of our personnel. The telecommunications
industry, nevertheless, is characterized by the existence of an ever-increasing
number of patent litigation and licensing activities. While there are currently
no intellectual property lawsuits existing or pending by or against ADTRAN, it
is possible that third parties may initiate litigation against us in the future,
resulting in costly litigation and/or judgments. Any intellectual property
infringement claims or related litigation against or by us could have a material
adverse effect on our business and operating results.

EMPLOYEES

As of December 31, 2001, we had 1,625 full-time employees in the United States,
four in Canada, five in Asia, five in Europe, and seven in Australia. Of our
total employees, 275 were in sales, marketing and service; 376 were in research
and development; 843 were in manufacturing and quality; and 152 were in
administration. None of our employees are represented by a collective bargaining
agreement nor have we ever experienced any work stoppage. We believe that our
relationship with our employees is good.

RISK FACTORS

The Private Securities Litigation Reform Act of 1995 (the "Reform Act") provides
a safe harbor for forward-looking statements made by or on behalf of ADTRAN.
ADTRAN and its representatives may from time to time make written or verbal
forward-looking statements, including statements contained in this report and
our other filings with the Securities and Exchange Commission and in our reports
to our stockholders. Generally, the words, "believe," "expect," "intend,"
"estimate," "anticipate," "will," "may," "could" and similar expressions
identify forward-looking statements. We caution you that any forward-looking
statements made by or on our behalf are subject to uncertainties and other
factors that could cause such statements to be wrong. Some of these
uncertainties and other factors are listed below (many of which we have
discussed in prior SEC filings). Though we have attempted to list
comprehensively these important factors, we caution investors that other factors
may prove to be important in the future in affecting our operating results. New
factors emerge from time to time, and it is not possible for us to predict all
of these factors, nor can we assess the impact each factor or combination of
factors may have on our business.

You are further cautioned not to place undue reliance on those forward-looking
statements because they speak only of our views as of the date the statements
were made. We undertake no obligation to publicly update or revise any
forward-looking statements, whether as a result of new information, future
events or otherwise.

The following are some of the risks that could affect our financial performance
or could cause actual results to differ materially from those expressed or
implied in our forward-looking statements:

We must continue to update and improve our products and develop new
products in order to compete and to keep pace with improvements in
telecommunications technology.

The markets for our products are characterized by rapidly changing technology,
evolving industry standards and continuing improvements in the
telecommunications service offerings of common carriers. If technologies or
standards applicable to our products, or common carrier service offerings based
on our products, become obsolete or fail to gain widespread commercial
acceptance, our existing products or products under development may become
obsolete or unmarketable.

Moreover, the introduction of products embodying new technologies, the emergence
of new industry standards or changes in common carrier service offerings could
adversely affect our ability to sell our products. For instance, we designed a
large number of our

8
products, to date, to apply primarily to the delivery of high-speed digital
communications over the last mile of the Local Loop over copper wire and we
compete favorably with our competitors by developing a high performance line of
products. We expect, however, that the increasing deployment of fiber-optic
cable, coaxial cable and wireless transmission in the Local Loop (each of which
uses a significantly different process of delivery) and the offering of Local
Loop services by non-traditional providers such as cable television companies,
may require that we develop new products or modify existing products to meet the
requirements of these delivery systems as they become more prevalent in order to
maintain our position in our markets.

Our sales and profitability in the past have resulted to a significant extent
from our ability to anticipate changes in technology, industry standards and
common carrier service offerings and to develop and introduce new and enhanced
products. Our continued ability to adapt will be a significant factor in
maintaining or improving our competitive position and our prospects for growth.
We cannot assure you that we will be able to respond effectively to changes in
technology, industry standards, common carrier service offerings or new product
announcements by our competitors. We also cannot assure you that we will be able
to successfully develop and market new products or product enhancements or that
such products or enhancements will achieve market acceptance. Any failure by us
to continue to anticipate or respond on a cost effective and timely basis to
changes in technology, industry standards, common carrier service offerings or
new product announcements by our competitors, or any significant delays in
product development or introduction, could have a material adverse effect on our
future profitability and our ability to market our products on a timely and
competitive basis.

Our dependence on a limited number of suppliers may prevent us from
delivering our products on a timely basis, which could have a material
adverse effect on customer relations and operating results.

Certain raw materials and key components used in our products are currently
available from only one source, and others are available from only a limited
number of sources. The availability of these raw materials and supplies is
subject to market forces beyond our control. From time to time, there may not be
sufficient quantities of raw materials and supplies in the marketplace to meet
the customer demand. Many companies utilize the same raw materials and supplies
in the production of their products as we use in our products. Companies with
more resources than our own may have a competitive advantage in obtaining raw
materials and supplies due to greater buying power. These factors can result in
reduced supply, higher prices of raw materials and delays in the receipt of
certain of our key components, which in turn may generate increased costs, lower
margins and delays in product delivery, with a corresponding adverse effect on
sales, customer relationships and revenue. Furthermore, due to general economic
conditions in the U.S. and globally, our suppliers may experience financial
difficulties, which could result in increased delays, additional costs or loss
of a supplier. We attempt to manage these risks through developing alternative
sources, through engineering efforts designed to obviate the necessity of
certain components, and by maintaining quality relationships and close personal
contact with each of our suppliers. However, we cannot assure you that delays in
or failures of deliveries of key components, either to us or to our contract
manufacturers, and consequent delays in product deliveries, will not occur in
the future.

Our dependence on subcontractors may result in reduced control over product
quality, delayed delivery of products and/or increased manufacturing costs,
each of which could negatively effect customer relations and operating
results.

We rely on subcontractors in the United States, Mexico and China for the
assembly of printed circuit board assemblies, sub-assemblies, chassis,
enclosures and equipment shelves, and, more recently, also to purchase the raw
materials used in and for such assembly. We are heavily dependent on four of
these subcontractors. This reliance on third-party subcontractors for the
assembly of our products involves several risks, including the unavailability of
or interruptions in access to certain process technologies and reduced control
over product quality, delivery schedules, manufacturing yields and costs. These
risks may be exacerbated by economic or political uncertainties or by natural
disasters in foreign countries in which our subcontractors may be located. To
date, we believe that we have successfully managed the risks of our dependence
on these subcontractors through a variety of efforts, which include seeking and
developing alternative subcontractors while maintaining existing relationships.
However, we cannot assure you that delays in product deliveries will not occur
in the future because of shortages resulting from this limited number of
subcontractors or from the financial or other difficulties of such parties. The
inability to develop alternative subcontractors if and as required in the
future, or the need to undertake required retraining and other activities
related to establishing and developing a new subcontractor relationship could
result in delays or reductions in product shipments which, in turn, could have a
negative effect on our customer relationships and operating results.

We compete in markets that have become increasingly competitive, which may
result in reduced gross profit margins and market share.

The markets for ADTRAN's products are intensely competitive. With the
development of the worldwide communications market and the growing demand for
related equipment, additional manufacturers have entered the markets in recent
years to offer products in competition with us. Additionally, certain companies
have, in recent years, developed the ability to deliver fiber-optic cable,
coaxial cable and wireless transmission to certain office centers and other
end-users. Competition would further increase if new companies

9
enter the market or existing competitors expand their product lines. For
example, federal legislation has been enacted that lifts the restrictions that
previously prevented the RBOCs from manufacturing telecommunications equipment.
The RBOCs, which in the aggregate are our largest customers, may increasingly
become our competitors in the markets that we share. Some of these potential
competitors may have greater financial, technological, manufacturing, sales and
marketing and personnel resources than we have. As a result, these competitors
may be able to respond more rapidly or effectively to new or emerging
technologies and changes in customer requirements, withstand significant price
decreases or devote greater resources to the development, promotion and sale of
their products than we can. In addition, our present and future competitors may
be able to enter our existing or future markets with products or technologies
comparable or superior to those that we offer. An increase in competition could
cause us to reduce prices, decrease our market share, require increased spending
by us on product development and sales and marketing, or cause delays or
cancellations in customer orders, any one of which could reduce our gross profit
margins and adversely affect our business and results of operations.

We depend heavily on sales to certain customers; the loss of any of these
customers would significantly reduce our revenues and net income.

Historically, a large percentage of our sales (typically more than 50%) have
been made to the RBOCs and major independent telecommunications companies. In
2001, these customers continued to comprise a large percentage (approximately
49%) of our revenue. As long as the RBOCs and other carriers represent such a
substantial percentage of our total sales, our future success will significantly
depend upon certain factors which are not within our control, including:

. the timing and size of future purchase orders, if any, from these
customers;
. the product requirements of these customers;
. the financial and operational success of these customers; and
. the success of these customers' services deployed using our
products.

Our sales to our large customers have in the past fluctuated and may fluctuate
significantly from quarter to quarter and year to year. The loss of or a
significant reduction or delay in sales to any such customer or the occurrence
of any such sales fluctuations could have a material adverse effect on our
business and results of operations. Further, any attempt by an RBOC or other
carrier to seek out additional or alternative suppliers or to undertake, as
permitted under applicable regulations, the production of such products
internally could have a material adverse effect on our operating results.

The lengthy approval process required by the RBOCs and other carriers could
result in fluctuations in our revenues.

In the industry in which we compete, a supplier must first obtain product
approvals from an RBOC or other carrier to sell its products to them. This
process can last from six to eighteen months depending on the technology, the
customer and the need for the product in the market. Consequently, we are
involved in a constant process of submitting for approval succeeding generations
of products as well as products that deploy new technology or respond to new
technology demand from an RBOC or other carrier. We have been successful in the
past in obtaining such approvals. However, we can not be certain that we will
obtain such approvals in the future or that sales of such products will continue
to occur. Furthermore, the delay in sales until the completion of the approval
process, the length of which is difficult to predict, could result in
fluctuations of revenue and uneven operating results from quarter to quarter or
year to year.

Consolidation in the Competitive Service Provider market could result in a
significant decrease in our revenue.

We sell a significant volume of our products to Competitive Service Providers,
relative newcomers to the telecom industry who compete with the established
networks of the Incumbent Local Exchange Carriers. This CSP market has been
overbuilt in recent years and months and is now in a process of consolidation.
Many of these CSP customers do not have a strong financial position and have
limited ability to access the public financial markets for additional funding
for growth and operations. If one or more of these CSPs fails, we could face
financial loss and increased bad debt expense, due to their inability to pay
outstanding invoices, as well as the corresponding decrease in customer base and
future revenue. Furthermore, a significant portion of our sales to CSPs are made
through independent distributors. The failure of one or more CSPs could also
damage a distributor to the point that the distributor could also experience
business failure and/or default on payments to ADTRAN.

10
Increased sales volume in international markets could result in increased
costs or loss of revenue due to factors inherent in these markets.

We are in the process of expanding into international markets, which currently
represent 4.5% of our net sales, and anticipate increased sales growth to be
generated from these markets. We currently have international sales offices in
Switzerland, Hong Kong, Montreal, Toronto, Melbourne and Beijing, and anticipate
opening an office in Mexico in 2002. Our international markets include Hong
Kong, China, Europe, Canada, Central America and Australia. A number of factors
inherent in doing business in these markets expose us to significantly more risk
than domestic business, including:

. local economic and market conditions;
. exposure to unknown customs and practices;
. potential political unrest;
. foreign exchange exposure;
. unexpected changes in or impositions of legislative or regulatory
requirements;
. less regulation of patents or other safeguards of intellectual
property; and
. difficulties in collecting receivables and inability to rely on
local government aid to enforce standard business practices.

Any of these factors, or others of which we are not currently aware, could
result in increased costs of operation or loss of revenue to ADTRAN.

Our success depends on our ability to reduce the selling prices of
succeeding generations of our products.

Our strategy is to attempt to increase unit sales volumes and our market share
each year by introducing succeeding generations of products having lower selling
prices and increased functionality as compared to prior generations of these
products. To maintain or increase our revenues and margins while continuing this
strategy, we must continue, in some combination, to increase sales volumes of
existing products, introduce and sell new products or reduce our per unit costs
at rates sufficient to compensate for the reduced revenue effect of continuing
reductions in the average sales prices of our products. We cannot assure you
that we will be able to maintain or increase revenues or margins by increasing
unit sales volumes of our products, introducing and selling new products or
reducing our per unit costs.

Our failure to adequately protect our intellectual property rights could
adversely effect the development and commercialization of our products.

Our future success depends in part upon our proprietary technology. Although we
attempt to protect our proprietary technology by contract, trademark, copyright
and patent registration and internal security, these protections may not be
adequate. Furthermore, our competitors can develop similar technology
independently without violating our proprietary rights. From time to time we
receive and may continue to receive notices from third parties, including some
of our competitors, claiming that we are infringing third-party patents or other
proprietary rights. We cannot predict whether we will prevail in any litigation
over third-party claims, or whether we will be able to license any valid and
infringed patents on commercially reasonable terms. Any of these claims, whether
with or without merit, could result in costly litigation, divert our
management's time, attention and resources, delay our product shipments or
require us to enter into royalty or licensing agreements. A third party may not
be willing to enter into a royalty or licensing agreement on acceptable terms,
if at all. If a claim of product infringement against us is successful and we
fail to obtain a license or develop or license non-infringing technology, our
business, financial condition and operating results could be affected adversely.

Our success depends on attracting and retaining key personnel.

Our business has grown significantly since its inception. Our success is
dependent in large part on the continued employment of our executive officers,
including Mark C. Smith (Chairman of the Board and Chief Executive Officer),
Howard A. Thrailkill (President, Chief Operating Officer and a director), and
other key management personnel, the unplanned departure of one or more of whom
could adversely affect our business. In addition, for ADTRAN to continue as a
successful entity, we must also be able to attract and retain key engineers and
technicians whose expertise helps us to maintain competitive advantages. We do
not have employment contracts or non-compete agreements with any of our
employees. We believe that our future success will depend in large part upon our
ability to continue to attract, retain, train and motivate highly skilled
employees who are in great demand. Properly managing our continued growth,
avoiding the problems often resulting from such growth and expansion, and
continuing to operate in the manner which has proven successful to us to date
will be critical to the future success of our business.

11
Two stockholders own or may influence a significant amount of our common
stock and may continue to have significant influence on our affairs.

Mark C. Smith, our Chief Executive Officer and Chairman of the Board of
Directors, and Lonnie S. McMillian, our Secretary and a director, and who along
with Mr. Smith is a co-founder of ADTRAN, together with certain of their family
members and family trusts, currently beneficially own approximately 45.4% of our
common stock. As a result, these individuals and the family trusts may be able
to control the election of our Board of Directors and in all likelihood will
continue to have significant influence over all matters requiring approval by
our stockholders.

The price of our common stock has been volatile and may continue to
fluctuate substantially.

Our common stock is traded on the Nasdaq National Market. Since our initial
public offering in August 1994, there has been and may continue to be
significant volatility in the market for our common stock, based on a variety of
factors, some of which are beyond our control, including the following:

. actual or anticipated fluctuations in our quarterly or annual
operating results;
. the gain or loss of significant contracts by us or our competitors;
. the entry of new competitors (potentially including the RBOCs) into
our markets;
. changes in management or additions or departures of key personnel;
. announcements of technological innovations, new products, changes
in product pricing, acquisitions, strategic partnerships, joint
ventures or capital commitments by us or our competitors;
. changes in financial estimates or investment recommendations by
securities analysts or our failure to perform in line with
analysts' expectations;
. legislative or regulatory changes; and
. other events and circumstances beyond our control.

In addition, the stock market recently has experienced significant price and
volume fluctuations which have particularly affected the share price of many
high technology companies like us; these fluctuations may be unrelated to the
operating performance of these companies.

ITEM 2. PROPERTIES
- --------------------------------------------------------------------------------

Our headquarters and principal administrative, engineering and manufacturing
facilities are located on a 80-acre campus in Cummings Research Park in
Huntsville, Alabama. Two office buildings contain 440,000 and 600,000 square
feet, respectively. These facilities are projected to accommodate a total of
3,000 employees, serving both our CN and EN divisions. We also have a 13,000 sq.
ft. engineering facility in Phoenix, Arizona which is used by our CN division.

In addition to our facilities listed above, we lease additional office space in
the United States and abroad, providing sales and service support for both our
CN and EN divisions. The United States offices are located in Akron, OH;
Chesterfield, MO; Clearwater, FL; Englewood, CO; Heardon, VA; Houston, TX;
Huntsville, AL; Irvine, CA; Irving, TX; Leawood, KS; Milford, CT; Naperville,
IL; Norcross, GA; Overland Park, KS; and San Antonio, TX; We also lease one
office in each of Montreal and Toronto, Canada, one in Hong Kong, one in
Beijing, China, one in Melbourne, Australia and one in Zurich, Switzerland.
These cancelable and noncancelable leases expire at various times between 2002
and 2004. See Note 10 of Notes to Financial Statements.

We also have 42 home-based offices serving both our CN and EN divisions, of
which 39 are located within the United States, one in Shenzhen, China, one in
Frankfurt, Germany and one in London, United Kingdom. In the United States, our
home-based offices are located in and around the following locations: Albany,
NY; Akron, OH; Atlanta, GA; Austin, TX; Babylon, NY; Baltimore, MD; Charleston,
WV; Chicago, IL; Cincinnati, OH; Columbus, OH; Concord, NH; Dallas, TX; Denver,
CO; Fort Lauderdale, FL; Hartford, CT; Harrisburg, PA; Houston, TX; Huntsville,
AL; Indianapolis, IN; Irvine, CA; Lincoln, NE; Los Angeles, CA; Minneapolis, MN;
Nashville, TN; Phoenix, AZ; Pittsburgh, PA; Providence, RI; Raleigh, NC;
Richmond, VA; Roanoke, VA; San Antonio, TX; San Diego, CA; San Francisco, CA;
San Jose, CA; Seattle, WA; St. Petersburg, FL; Towaco, NJ; Wilkes-Barre, PA; and
Windsor, MI.

ITEM 3. LEGAL PROCEEDINGS
- --------------------------------------------------------------------------------

We have been involved from time to time in litigation in the normal course of
our business. We are not aware of any pending or threatened litigation matters
that could have a material adverse effect on us.

12
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
- --------------------------------------------------------------------------------

No matter was submitted by ADTRAN to vote of security holders during the fiscal
quarter ended December 31, 2001.

ITEM 4(A). EXECUTIVE OFFICERS OF THE REGISTRANT
- --------------------------------------------------------------------------------

Set forth below, in accordance with General Instruction G(3) of Form 10-K and
Instruction 3 of Item 401(b) of Regulation S-K, is certain information regarding
the executive officers of ADTRAN. Unless otherwise indicated, the information
set forth is as of December 31, 2001.

Mark C. Smith Age 61
Mr. Smith is one of the co-founders of ADTRAN
1995 to present Chairman of the Board and Chief Executive Officer
1986 - 1995 Chairman of the Board, Chief Executive Officer and
President

Howard A. Thrailkill Age 63
1995 to present President, Chief Operating Officer and Director
1992 - 1995 Executive Vice President and Chief Operating Officer

James E. Matthews Age 45
2001 to present Senior Vice President - Finance, Chief Financial
Officer and Treasurer
1999 - 2001 Chief Financial Officer, Home Wireless Networks, Inc.
1998 - 1999 Chief Executive Officer, Miltope Group, Inc.
1995 - 1998 Vice President Finance and Chief Financial Officer,
Miltope Group, Inc.
1992 - 1995 Controller, Hughes Training, Inc.

Thomas R. Stanton Age 37
2001 to present Senior Vice President and General Manger - CN
1999 - 2001 Vice President and General Manager - CN
1995 - 1999 Vice President - CN Marketing
1995 VP - Marketing & Engineering, Transcrypt International,
Inc.
1994 - 1995 Sr. Director, Marketing, E.F. Johnson Company
1993 - 1994 Director, Marketing, E.F. Johnson Company

Peter C. Voetsch Age 49
2001 to present Senior Vice President - Operations
1996 - 2001 Plant Manager, DaimlerChrysler Corporation
1987 - 1996 Business Manager, Electronics Division, DaimlerChrysler
Corporation

Danny J. Windham Age 42
2001 to present Senior Vice President and General Manager - EN
1999 - 2001 Vice President and General Manager - EN
1995 - 1999 Vice President - EN Marketing
1994 - 1995 Director of Marketing
1989 - 1994 Manager of Product Management

Robert A. Fredrickson Age 51
1996 to present Vice President - CN Sales
1996 Vice President, Broadband Business Development, DSC
Communications Corp.
1991 - 1996 Senior Director, Access Products, DSC Communications
Corp.

Steven L. Harvey Age 41
2002 Vice President - EN and Competitive Service Provider
Sales
1999 - 2001 Vice President - Competitive Service Provider Sales
1996 - 1999 Vice President - EN Sales
1995 - 1996 Executive Vice President, Data Processing Sciences
Corporation
1991 - 1995 Vice President, Data Processing Sciences Corporation

13
P. Steven Locke          Age 53
2000 to present Vice President - CN Marketing
1999 - 2000 Vice President, Sprint Local Division Sales for Lucent
Technologies
1997 - 1999 Senior Director of Sales, ADTRAN, Inc.
1993 - 1997 Vice President and General Manager, Business Network
Group, Sprint North Supply

Everette R. Ramage Age 54
1999 to present Vice President - EN Engineering
1993 - 1999 Engineering Manager, EN DDS Group

Kevin W. Schneider Age 38
1999 to present Vice President - Technology
1996 - 1999 Chief Scientist
1992 - 1996 Staff Scientist

There are no family relationships among the directors or executive officers.

All officers are elected annually by and serve at the pleasure of the Board of
Directors of ADTRAN.

14
PART II

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON STOCK AND
RELATED STOCKHOLDER MATTERS
- --------------------------------------------------------------------------------

ADTRAN's common stock has been traded on the Nasdaq National Market under the
symbol ADTN since our initial public offering of common stock in August 1994.
Prior to the initial public offering, there was no established trading market
for our common stock. As of January 31, 2002, ADTRAN had 430 shareholders of
record and approximately 10,500 beneficial owners of shares held in street name.
The following table shows the high and low sale prices per share for the common
stock as reported by Nasdaq for the periods indicated:

2001 Quarters High Low

First $29.50 $19.88
Second $30.65 $18.00
Third $25.90 $17.85
Fourth $29.05 $18.00

2000 Quarters High Low

First $80.50 $49.06
Second $73.00 $44.00
Third $73.25 $41.13
Fourth $48.19 $16.56

ADTRAN has operated with a policy of retaining earnings, and presently intends
to retain all future earnings for use in the development of its business and
does not anticipate paying any cash dividends in the foreseeable future.

15
ITEM 6. SELECTED FINANCIAL DATA
- --------------------------------------------------------------------------------

The following selected financial data concerning ADTRAN for and as of the end of
each of the years in the five-year period ended December 31, 2001, are derived
from the financial statements of ADTRAN, which have been audited by
PricewaterhouseCoopers LLP, independent accountants. The selected financial data
are qualified in their entirety by the more detailed information and financial
statements, including the notes thereto. The financial statements of ADTRAN as
of December 31, 2001 and 2000 and for each of the years in the three-year period
ended December 31, 2001, and the report of PricewaterhouseCoopers LLP thereon,
are included elsewhere in this report.

INCOME STATEMENT DATA
(IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
Year Ended December 31, 2001 2000 1999 1998 1997
- -----------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C>
Sales
CN (Carrier Networks Division) $238,367 $315,228 $230,967 $167,500 $171,838
EN (Enterprise Networks Division) 148,714 147,721 136,240 119,059 93,497
- -----------------------------------------------------------------------------------------------------------------------------
Total Sales 387,081 462,949 367,207 286,559 265,335
- -----------------------------------------------------------------------------------------------------------------------------
Cost of Sales 213,760 233,430 178,629 130,010 130,254
- -----------------------------------------------------------------------------------------------------------------------------
Gross profit 173,321 229,519 188,578 156,549 135,081
- -----------------------------------------------------------------------------------------------------------------------------
Selling, general and administrative expenses 95,954 87,116 71,735 62,061 44,973
Research and development expenses 58,935 50,628 42,018 37,222 30,055
- -----------------------------------------------------------------------------------------------------------------------------
Operating income 18,432 91,775 74,825 57,266 60,053
- -----------------------------------------------------------------------------------------------------------------------------
Interest income 8,077 9,025 5,350 5,824 4,175
Interest expense (2,069) (1,802) (2,312) (2,287) (1,839)
Other income (expense) (28) (4) (673) (188) 438
Net realized investment gains (losses) (674) 84,040 0 0 0
- -----------------------------------------------------------------------------------------------------------------------------
Income before provision for income taxes 23,738 183,034 77,190 60,615 62,827
- -----------------------------------------------------------------------------------------------------------------------------
Provision for income taxes 6,409 62,232 26,244 20,306 22,618
- -----------------------------------------------------------------------------------------------------------------------------
Net income $17,329 $120,802 $50,946 $40,309 $40,209
- -----------------------------------------------------------------------------------------------------------------------------
Earnings per common share-basic $.45 $3.13 $1.33 $1.03 $1.03
Earnings per common share assuming dilution /(1)/ $.45 $3.04 $1.31 $1.03 $1.02
Weighted average shares outstanding-basic 38,567 38,647 38,335 38,982 39,202
Weighted average shares outstanding assuming
dilution /(1)/ 38,676 39,704 38,831 39,164 39,565
</TABLE>

BALANCE SHEET DATA
(IN THOUSANDS)

<TABLE>
<CAPTION>
Year Ended December 31, 2001 2000 1999 1998 1997
- -----------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C>
Working capital $217,387 $262,778 $181,147 $150,535 $149,184
- -----------------------------------------------------------------------------------------------------------------------------
Total assets $522,537 $546,336 $556,296 $301,711 $282,401
- -----------------------------------------------------------------------------------------------------------------------------
Deferred income taxes $8,284 $15,342 $80,265 $3,295 $2,148
- -----------------------------------------------------------------------------------------------------------------------------
Total debt $50,000 $50,000 $50,000 $50,000 $50,000
- -----------------------------------------------------------------------------------------------------------------------------
Stockholders' equity $437,628 $434,425 $400,052 $231,389 $212,037
</TABLE>

/(1)/ Assumes exercise of dilutive stock options calculated under the treasury
stock method. See Notes 1 and 11 of Notes to Financial Statements.

16
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS
- --------------------------------------------------------------------------------

OVERVIEW

ADTRAN designs, develops, manufactures, markets and services a broad range of
high-speed network access products utilized by providers of telecommunications
services (serviced by ADTRAN's Carrier Networks Division or CN) and corporate
end-users (serviced by ADTRAN's Enterprise Networks Division or EN). We
currently sell our products to a large number of carriers, including all
Regional Bell Operating Companies ("RBOCs"), and to private and public
enterprises worldwide.

Although total sales did not increase this year compared to last year due to an
overall downturn in the telecommunications market, we have protected revenue by
maintaining our strategy of increasing unit volume and market share through the
introduction of succeeding generations of products having lower selling prices
and increased functionality as compared both to the prior generation of a
product and to the products of competitors. An important part of ADTRAN's
strategy is to engineer the reduction of the product cost of each succeeding
product generation and then to lower the product's price based on the cost
savings achieved. As a part of this strategy, we seek in most instances to be a
low-cost, high-quality provider of products in our markets. ADTRAN's success
to-date is attributable in large measure to our ability to design our products
initially with a view to their subsequent re-design, allowing both increased
functionality and reduced manufacturing costs in each succeeding product
generation. This strategy enables ADTRAN to sell succeeding generations of
products to existing customers, while increasing our market share by selling
these enhanced products to new customers.

Our operating results have fluctuated on a quarterly basis in the past, and
operating results may vary significantly in future periods due to a number of
factors. We operate with very little order backlog. A substantial majority of
our sales in each quarter results from orders booked in that quarter and firm
purchase orders released in that quarter by customers under agreements
containing non-binding purchase commitments. Furthermore, a majority of
customers typically require prompt delivery of products. This results in a
limited backlog of orders for these products and requires us to maintain
sufficient inventory levels to satisfy anticipated customer demand. If near-term
demand for ADTRAN's products declines, or if potential sales in any quarter do
not occur as anticipated, our financial results could be adversely affected.
Operating expenses are relatively fixed in the short term; therefore, a
shortfall in quarterly revenues could impact ADTRAN's financial results
significantly in a given quarter. Further, maintaining sufficient inventory
levels to assure prompt delivery of our products increases the amount of
inventory which may become obsolete and increases the risk that the obsolescence
of such inventory may have an adverse effect on our business and operating
results.

ADTRAN's operating results may also fluctuate as a result of a number of other
factors, including increased competition, customer order patterns, changes in
product mix, product warranty returns and announcements of new products by
ADTRAN or our competitors. Accordingly, ADTRAN's historical financial
performance is not necessarily a meaningful indicator of future results, and, in
general, management expects that ADTRAN's financial results may vary from period
to period. See Note 12 of Notes to Financial Statements.

CRITICAL ACCOUNTING POLICIES

Our management believes the following critical accounting policies, among
others, affect its more significant judgments and estimates used in the
preparation of our consolidated financial statements. We maintain allowances for
doubtful accounts for estimated losses resulting from the inability of our
customers to make required payments. If the financial condition of our customers
were to deteriorate, resulting in an impairment of their ability to make
payments, additional allowances may be required. We write down our inventory for
estimated obsolescence or unmarketable inventory equal to the cost of inventory
and the estimated market value based upon assumptions about future demand and
market conditions. If actual future demand or market conditions are less
favorable than those projected by management, additional inventory write-downs
may be required. We hold minority interests in publicly traded companies whose
share prices may be volatile and minority interests and debt securities of
non-publicly traded companies whose value may be difficult to determine. Future
adverse changes in market conditions or poor operating results of underlying
investments could result in losses or an inability to recover the carrying value
of the investments that may not be reflected in an investment's current carrying
value, thereby possibly requiring an impairment charge in the future.

17
RESULTS OF OPERATIONS

The following table presents selected financial information derived from
ADTRAN's statements of income expressed as a percentage of sales for the years
indicated.

(Stated as % of sales)

<TABLE>
<CAPTION>
Years Ended December 31, 2001 2000 1999
- ------------------------------------------------------------------------------------------
<S> <C> <C> <C>
Sales
CN (Carrier Networks Division) 61.6% 68.1% 62.9%
EN (Enterprise Networks Division) 38.4 31.9 37.1
- ------------------------------------------------------------------------------------------
Total Sales 100.0 100.0 100.0
- ------------------------------------------------------------------------------------------
Cost of Sales 55.2 50.4 48.7
- ------------------------------------------------------------------------------------------
Gross profit 44.8 49.6 51.3
- ------------------------------------------------------------------------------------------
Selling, general and administrative expenses 24.8 18.8 19.5
Research and development expenses 15.2 10.9 11.4
- ------------------------------------------------------------------------------------------
Operating income 4.8 19.9 20.4
- ------------------------------------------------------------------------------------------
Interest income 2.2 1.9 1.5
Interest expenses (0.5) (0.4) (0.6)
Other expenses (0.1) 0.0 (0.2)
Net realized investment gains (losses) (0.2) 18.1 0.0
- ------------------------------------------------------------------------------------------
Income before provisions for income taxes 6.2 39.5 21.0
- ------------------------------------------------------------------------------------------
Provision for income taxes 1.7 13.4 7.1
- ------------------------------------------------------------------------------------------
Net income 4.5% 26.1% 13.9%
- ------------------------------------------------------------------------------------------
</TABLE>

2001 COMPARED TO 2000

Sales

ADTRAN's sales decreased 16.4% from $462,949,000 in 2000 to $387,080,000 in
2001. Sales for the CN division decreased 24.4% from $314,228,000 in 2000 to
$238,367,000 in 2001. The decrease in CN sales resulted from a downturn in the
Carrier Access market. CN sales as a percentage of total sales, decreased from
68.1% in 2000 to 61.6% in 2001. Sales of EN products increased 0.7% from
$147,721,000 in 2000 to $148,713,000 in 2001. Sales volume for EN remained
stable due to market acceptance of ADTRAN's Integrated Access products. As a
percentage of total sales, EN sales increased from 31.9% in 2000 to 38.4% in
2001.

Cost of Sales

Cost of sales decreased from $233,429,000 in 2000 to $213,760,000 in 2001. As a
percentage of sales, cost of sales increased from 50.4% in 2000 to 55.2% in
2001. This increase was due primarily to a rise in material cost as a percentage
of sales. CN cost of sales decreased from $168,342,000 in 2000 to $144,724,000
in 2001. CN cost of sales as a percentage of CN sales increased from 53.4% in
2000 to 60.7% in 2001. EN cost of sales increased from $65,058,000 in 2000 to
$69,037,000 in 2001. EN cost of sales as a percentage of EN sales increased from
44.0% in 2000 to 46.4% in 2001. An important part of ADTRAN's strategy is to
reduce the product cost of each succeeding product generation and then to lower
the product's price based on the cost savings achieved. This strategy sometimes
results in variations in ADTRAN's gross profit margin due to timing differences
between the lowering of product selling prices and the full realization of cost
reductions. In view of the rapid pace of new product introductions by ADTRAN,
this strategy may result in variations in gross profit margins that, for any
particular financial period, can be difficult to predict.

Selling, General and Administrative Expenses

Selling, general and administrative expenses increased 10.1% from $87,116,000 in
2000 to $95,954,000 in 2001. Beginning in mid year 2000, we increased
expenditures for the expansion of our infrastructure in both sales and support
personnel in an effort to expand our customer base and for increased initiatives
in the EN and International markets. As a result, selling, general and
administrative expenses as a percentage of sales increased from 18.8% in 2000 to
24.8% in 2001. However, during the second half of 2001, selling, general and
administrative expenses decreased 4.2% from the second half of 2000 due to a
reduction in force and salary reductions. During 2001, a telecom distributor
experienced financial difficulties, causing us to increase our allowance for bad
debt by $3,148,000. Selling, general and administrative expenses as a percentage
of sales will fluctuate whenever there is a significant fluctuation in revenues
during the periods being compared.

18
Research and Development Expenses

Research and development expenses increased 16.4% from $50,628,000 in 2000 to
$58,935,000 in 2001. This increase was due to increased engineering costs
associated with new product introductions and feature enhancement activities. As
a percentage of sales, research and development expenses increased from 10.9% in
2000 to 15.2% in 2001. ADTRAN continually evaluates new product opportunities
and engages in intensive research and product development efforts. To date,
ADTRAN has expensed all product research and development costs as incurred.
Additionally, ADTRAN frequently invests heavily in up-front market development
efforts prior to the actual commencement of sales of a major new product. As a
result, ADTRAN may incur significant research and development expenses prior to
the receipt of revenues from a major new product group. ADTRAN is presently
incurring research and development expenses in connection with its new products
and its expansion into international markets. Research and development expenses
as a percentage of sales will fluctuate whenever there is a significant
fluctuation in revenues during the periods being compared.

Interest Expense

Interest expense increased 14.8% from $1,802,000 in 2000 to $2,069,000 in 2001.
ADTRAN currently pays interest on a $50,000,000 revenue bond, the proceeds of
which were used to expand our facilities in Huntsville, Alabama.

Interest Income

Interest income decreased 10.5% from $9,025,000 in 2000 to $8,077,000 in 2001.
The decrease is largely due to lower interest rates compared to the prior year.

Net Realized Investment Gains and Losses

Net realized investment gains and losses decreased 100.8% from a net gain of
$84,040,000 in 2000 to a net loss of ($674,000) in 2001. The decrease is
primarily a result of a substantial net realized investment gain in 2000 from
the sale of certain marketable securities of a single issuer.

Income Taxes

Our effective tax rate declined from 34% in 2000 to 27% in 2001 due to a higher
mix of non-taxable income in 2001, as well as higher tax credits as a percent of
taxable income. Income taxes (without regard to taxes on realized investment
gains in the year 2000 of $28,574,000) decreased 81.0% from $33,657,000 in 2000
to $6,409,000 in 2001.

Net Income

As a result of the above factors, net income decreased 85.7% from $120,802,000
in 2000 to $17,329,000 in 2001. As a percentage of sales, net income decreased
from 26.1% in 2000 to 4.5% in 2001.

2000 COMPARED TO 1999

Sales

ADTRAN's sales increased 26.1% from $367,207,000 in 1999 to $462,949,000 in
2000. Sales for the CN division increased 36.4% from $230,967,000 in 1999 to
$315,228,000 in 2000. CN sales, as a percentage of total sales, increased from
62.9% in 1999 to 68.1% in 2000. Sales of EN products increased 8.4% from
$136,240,000 in 1999 to $147,721,000 in 2000. As a percentage of total sales, EN
sales decreased from 37.1% in 1999 to 31.9% in 2000. In general, the increased
sales resulted from increased sales volume to existing customers and from
increased market penetration. The primary factors contributing to the increase
in sales in 2000 were (i) additional market penetration for our HDSL products,
(ii) continuing growth in demand for T1 products, (iii) continuing growth in
sales of the ATLAS(TM) integrated access device, and (iv) continuing growth in
sales of the Total Access(R) product line.

Cost of Sales

Cost of sales increased from $178,629,000 in 1999 to $233,429,000 in 2000. As a
percentage of sales, cost of sales increased from 48.7% in 1999 to 50.4% in
2000. This increase was due primarily to a rise in material cost as a percentage
of sales. CN cost of sales increased from $122,158,000 in 1999 to $168,342,000
in 2000. CN cost of sales as a percentage of CN sales increased from 52.9% in
1999 to 53.4% in 2000. EN cost of sales increased from $56,472,000 in 1999 to
$65,058,000 in 2000. As a percentage of EN sales, EN cost of sales increased
from 41.5% in 1999 to 44.0% in 2000. An important part of ADTRAN's strategy is
to reduce the product

19
cost of each succeeding product generation and then to lower the product's price
based on the cost savings achieved. This strategy sometimes results in
variations in ADTRAN's gross profit margin due to timing differences between the
lowering of product selling prices and the realization of cost reductions. In
view of the rapid pace of new product introductions by ADTRAN, this strategy may
result in variations in gross profit margins that, for any particular financial
period, can be difficult to predict.

Selling, General and Administrative Expenses

Selling, general and administrative expenses increased 21.4% from $71,735,000 in
1999 to $87,116,000 in 2000. The net increase was due to expanding
infrastructure on both sales and support personnel. However, as a percentage of
sales, selling, general and administrative expenses decreased from 19.5% in 1999
to 18.8% in 2000. The decrease is due primarily to operating efficiencies,
realized as a result of a larger sales base. Selling, general and administrative
expenses as a percentage of sales will fluctuate whenever there is a significant
fluctuation in revenues in the periods being compared.

Research and Development Expenses

Research and development expenses increased 20.5% from $42,018,000 in 1999 to
$50,628,000 in 2000. This increase was due to increased engineering costs
associated with new product introductions and feature enhancement activities. As
a percentage of sales, research and development expenses decreased from 11.4% in
1999 to 10.9% in 2000. ADTRAN continually evaluates new product opportunities
and engages in intensive research and product development efforts. To date,
ADTRAN has expensed all product research and development costs as incurred.
Additionally, ADTRAN frequently invests heavily in up-front market development
efforts prior to the actual commencement of sales of a major new product. As a
result, ADTRAN may incur significant research and development expenses prior to
the receipt of revenues from a major new product group. ADTRAN is presently
incurring research and development expenses in connection with its new products
and its expansion into international markets. Research and development expenses
as a percentage of sales will fluctuate whenever there is a significant
fluctuation in revenues in the periods being compared.

Interest Expense

Interest expense decreased 22.0% from $2,312,000 in 1999 to $1,802,000 in 2000.
ADTRAN currently pays interest on a $50,000,000 revenue bond, the proceeds of
which were used to expand our facilities in Huntsville, Alabama.

Net Realized Investment Gains

Net realized investment gains increased from $0 in 1999 to $84,040,000 in 2000.
The increase was largely due to the sale of certain marketable equity securities
in 2000 (included in long-term investments in the accompanying condensed balance
sheet).

Income Taxes

Our effective annual tax rate from 1999 to 2000 remained consistent at
approximately 34%.

Net Income

As a result of the above factors, net income increased 137.1% from $50,946,000
in 1999 to $120,802,000 in 2000. As a percentage of sales, net income increased
from 13.9% in 1999 to 26.1% in 2000. A substantial contribution to the increase
in net income was the realized gain on the sale of certain marketable
securities.

LIQUIDITY AND CAPITAL RESOURCES

ADTRAN completed the construction of Phase IV of our corporate headquarters in
Huntsville, Alabama, in October 2000. Over the next several years, we expect to
spend approximately an additional $25,000,000 to equip Phase IV. Fifty million
dollars of ADTRAN's Phase III expansion was approved for participation in an
incentive program offered by the Alabama State Industrial Development Authority
(the "Authority"). That incentive program enables participating companies to
generate Alabama corporate income tax credits that can be used to reduce the
amount of Alabama corporate income taxes that would otherwise be payable. There
can be no assurance that the State of Alabama will continue to make these
corporate income tax credits available in the future, therefore ADTRAN may not
realize the full benefit of these incentives. Through December 31, 2001, the
Authority had issued $50,000,000 of its taxable revenue bonds pursuant to the
incentive program and loaned the proceeds from the sale of the bond to ADTRAN.
We are required to make payments to the Authority in amounts necessary to pay
the principal of and interest on the Authority's Taxable Revenue Bond, Series
1995, as amended, currently outstanding in the aggregate principal amount of
$50,000,000. The bond matures on January 1, 2020, and bears interest at the rate
of 45 basis points over the money market rate of First Union National Bank of
Tennessee.

20
ADTRAN's working capital position decreased 16.5% from $262,778,000 as of
December 31, 2000 to $217,876,000 as of December 31, 2001. Accounts payable,
accounts receivable and other receivables decreased 54.4%, 26.2% and 73.2%
respectively, from December 31, 2000 to December 31, 2001. These decreases are
directly related to the overall industry slow down and the consolidation of our
subcontractors. ADTRAN has used, and expects to continue to use, the cash
generated from operations for working capital and other general corporate
purposes, including (i) product development activities to enhance our existing
products and develop new products and (ii) the expansion of sales and marketing
activities. Inventory decreased 36.3% from $89,253,000 in 2000 to $56,849,000 in
2001. The decrease in inventory is attributable to management's continued
efforts to streamline our production process and focus on manufacturing
velocity.

In October 1998, the Board of Directors authorized ADTRAN to re-purchase
2,000,000 shares of our outstanding common stock. In July 2001, the Board
approved the re-purchase of an additional 2,000,000 shares. As of December 31,
2001, we had repurchased 336,417 shares of our common stock at a total cost of
$6,540,000 under these programs.

Capital expenditures totaling $13,216,000, $32,540,000 and $36,237,000 in 2001,
2000 and 1999, respectively, were used to expand our headquarters and to
purchase equipment.

At December 31, 2001, ADTRAN's cash on hand of $81,280,000 and short-term
investments of $26,283,000 placed our short-term cash availability at
$107,563,000. During 2001, ADTRAN's balance sheet has been substantially
strengthened. As reflected in our statement of cash flows, we generated $93.2
million in cash from operating activities. This was largely due to our
substantial decreases in inventory, stable collection cycle and our collection
of other receivables.

Investment Policy

ADTRAN's short-term investments represent the liquid and working funds for the
present and future operations of the company. These assets are invested with
appropriate diversification to preserve capital, provide liquidity, and generate
returns appropriate to current instruments in prevailing market conditions.

Long-term investments are likewise invested to preserve principal and liquidity,
while maximizing overall returns on our monetary assets. This is achieved
through conservative investments and appropriate diversification in fixed
income, public equity, and private equity portfolios.

We intend to finance our operations in the future with cash flow from operations
and remaining borrowed taxable revenue bond proceeds. We believe these available
sources of funds to be adequate to meet our operating and capital needs for the
foreseeable future.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
- --------------------------------------------------------------------------------

ADTRAN has not conducted transactions, established commitments or entered into
relationships requiring disclosures beyond those provided elsewhere in this Form
10-K.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
- --------------------------------------------------------------------------------

The following financial statements are contained in this report.

Page
----
Report of Independent Accountants.........................................22

Financial Statements for Years Ended December 31, 2001, 2000 and 1999
Balance Sheets.......................................................23
Statements of Income.................................................24
Statements of Changes in Stockholders' Equity........................25
Statements of Cash Flows.............................................26

Schedule II - Valuation and Qualifying Accounts...........................41

21
REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholders of ADTRAN, Inc.

In our opinion, the financial statements listed in the accompanying index
present fairly, in all material respects, the financial position of ADTRAN, Inc.
at December 31, 2001 and 2000, and the results of its operations and its cash
flows for each of the three years in the period ended December 31, 2001 in
conformity with accounting principles generally accepted in the United States of
America. In addition, in our opinion, the financial statement schedule listed in
the accompanying index presents fairly, in all material respects, the
information set forth therein when read in conjunction with the related
financial statements. These financial statements and financial statement
schedule are the responsibility of the Company's management; our responsibility
is to express an opinion on these financial statements and financial statement
schedule based on our audits. We conducted our audits of these statements in
accordance with auditing standards generally accepted in the United States of
America, which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

/s/PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Birmingham, Alabama
January 28, 2002

22
FINANCIAL STATEMENTS

Balance Sheets
December 31, 2001 and 2000

ASSETS

<TABLE>
<CAPTION>
2001 2000
----------------------------------
<S> <C> <C>
Current Assets
- --------------------------------------------------------------------------------------------------------
Cash and cash equivalents $ 81,280,409 $ 60,748,728
Short-term investments 26,282,961 32,650,183
Accounts receivable, less allowance for doubtful accounts of
$3,882,099 and $813,003 in 2001 and 2000, respectively 60,598,867 82,133,831
Other receivables 9,609,478 35,862,774
Inventory, net 56,849,470 89,252,729
Prepaid expenses 3,486,470 4,032,438
Deferred income taxes 5,904,755 4,505,008
- --------------------------------------------------------------------------------------------------------
Total current assets 244,012,410 309,185,691
- --------------------------------------------------------------------------------------------------------
Property, plant and equipment, net 120,133,445 123,713,176
Other assets 489,000 469,000
Long-term investments 157,901,718 112,968,138
- --------------------------------------------------------------------------------------------------------
Total assets $522,536,573 $546,336,005
- --------------------------------------------------------------------------------------------------------

LIABILITIES AND STOCKHOLDERS' EQUITY

Current Liabilities
Accounts payable $15,551,685 $ 34,113,832
Accrued expenses 7,721,682 8,560,073
Income taxes payable 3,352,049 3,734,234
- --------------------------------------------------------------------------------------------------------
Total current liabilities 26,625,416 46,408,139
- --------------------------------------------------------------------------------------------------------
Bonds payable 50,000,000 50,000,000
Deferred income taxes 8,283,601 15,342,435
- --------------------------------------------------------------------------------------------------------
Total liabilities 84,909,017 111,750,574
- --------------------------------------------------------------------------------------------------------

Minority interest in subsidiary 160,000

Commitments and Contingencies (see Note 10)

Stockholders' equity
- --------------------------------------------------------------------------------------------------------
Common stock, par value $.01 per share; 200,000,000 shares
authorized; 39,445,198 shares issued in 2001 and in 2000 394,452 394,452
Additional paid-in capital 96,384,091 96,707,263
Accumulated other comprehensive income 9,374,389 19,870,288
Retained earnings 350,233,932 332,905,403
Less treasury stock at cost: 910,236 and 733,192 shares
in 2001 and 2000, respectively (18,759,308) (15,451,975)
- --------------------------------------------------------------------------------------------------------
Total stockholders' equity 437,627,556 434,425,431
- --------------------------------------------------------------------------------------------------------
Total liabilities and stockholders' liability $522,536,573 $546,336,005
- --------------------------------------------------------------------------------------------------------
</TABLE>

The accompanying notes are an integral part of these financial statements.

23
Statements of Income
Years ended December 31, 2001, 2000 and 1999

<TABLE>
<CAPTION>
2001 2000 1999
- ----------------------------------------------------------------------------------------------------------
<S> <C> <C> <C>
Sales $387,080,690 $462,948,721 $367,207,437
Cost of sales 213,759,507 233,429,280 178,629,643
- ----------------------------------------------------------------------------------------------------------
Gross profit 173,321,183 229,519,441 188,577,794
- ----------------------------------------------------------------------------------------------------------

Selling, general and administrative expenses 95,954,228 87,115,889 71,734,959
Research and development expenses 58,934,952 50,628,190 42,017,779
- ----------------------------------------------------------------------------------------------------------
Operating income 18,432,003 91,775,362 74,825,056
- ----------------------------------------------------------------------------------------------------------

Interest income 8,076,522 9,024,543 5,349,762
Interest expense (2,068,653) (1,802,158) (2,311,667)
Other expenses (28,527) (4,125) (672,920)
Net realized investment gains (losses) (673,851) 84,040,126

Income before provision for income taxes 23,737,494 183,033,748 77,190,231
- ----------------------------------------------------------------------------------------------------------
Provision for income taxes 6,408,965 62,231,487 26,244,677
- ----------------------------------------------------------------------------------------------------------
Net income $17,328,529 $120,802,261 $50,945,554
- ----------------------------------------------------------------------------------------------------------

Weighted average shares outstanding 38,567,324 38,647,288 38,334,507
Weighted average shares outstanding assuming dilution /(1)/ 38,676,187 39,704,286 38,831,091

Earnings per common share - basic $.45 $3.13 $1.33
Earnings per common share - assuming dilution /(1)/ $.45 $3.04 $1.31
- ----------------------------------------------------------------------------------------------------------
</TABLE>

/(1)/ Assumes exercise of dilutive stock options calculated under the treasury
stock method.

The accompanying notes are an integral part of these financial statements.

24
Statements of Changes in Stockholders' Equity
Years ended December 31, 2001, 2000 and 1999

<TABLE>
<CAPTION>
Common Stock
Par Value Additional
Number ($.01 Per Paid-In Retained
of shares Share) Capital Earnings Treasury Stock
- ---------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C>
Balance, December 31, 1998 39,422,033 $394,221 $93,053,174 $161,157,588 ($23,216,047)
- ---------------------------------------------------------------------------------------------------------
Net income 50,945,554
Unrealized gain on
marketable equity
securities (net of
deferred tax of
$76,000,000)
Stock options exercised:
various prices per share 23,165 231 192,462 1,532,589
Purchase of treasury stock:
20,160 shares (325,991)
Income tax benefit from
exercise of non-qualified
stock options 318,690

Balance, December 31, 1999 39,445,198 $394,452 $93,564,326 $212,103,142 ($22,009,449)
- ---------------------------------------------------------------------------------------------------------
Net Income 120,802,261
Change in unrealized gain
on marketable
equity securities
(net of deferred tax of
$22,994,436)
Reclassification adjustment
for amounts included
in net income (net of
income tax of
$29,954,217)
Stock options exercised:
various prices per share 140,217 6,627,900
Purchase of treasury stock:
1,176 shares (70,426)
Income tax benefit from
exercise of
non-qualified stock
options 3,002,720

Balance, December 31, 2000 39,445,198 $394,452 $96,707,263 $332,905,403 ($15,451,975)
- ---------------------------------------------------------------------------------------------------------
Net Income 17,328,529
Change in unrealized gain
on marketable securities
(net of deferred tax of
$4,077,218)
Reclassification adjustment
for amounts included in
net income, (net of
income tax of $1,849,820)
Stock options exercised:
various prices per share (339,623) 793,017
Purchase of treasury stock:
215,000 shares (4,100,350)
Income tax benefit from
exercise of non-qualified
stock options 16,451


Balance, December 31, 2001 39,445,198 $394,452 $96,384,091 $350,233,932 ($18,759,308)
- ---------------------------------------------------------------------------------------------------------

<CAPTION>
Unrealized
Gain on
Marketable Total
Equity Stockholders'
Securities Equity
- ---------------------------------------------------------------
<S> <C> <C>
Balance, December 31, 1998 $0 $231,388,936
- ---------------------------------------------------------------
Net income 50,945,554
Unrealized gain on
marketable equity
securities (net of
deferred tax of
$76,000,000) 116,000,000 116,000,000
Stock options exercised:
various prices per share 1,725,282
Purchase of treasury stock:
20,160 shares (325,991)
Income tax benefit from
exercise of non-qualified
stock options 318,690

Balance, December 31, 1999 $116,000,000 $400,052,471
- ---------------------------------------------------------------
Net Income 120,802,261
Change in unrealized gain
on marketable
equity securities
(net of deferred tax of
$22,994,436) (40,719,712) (40,719,712)
Reclassification adjustment
for amounts included
in net income (net of
income tax of
$29,954,217) (55,410,000) (55,410,000)
Stock options exercised:
various prices per share 6,768,117
Purchase of treasury stock:
1,176 shares (70,426)
Income tax benefit from
exercise of
non-qualified stock
options 3,002,720

Balance, December 31, 2000 $19,870,288 $434,425,431
- ---------------------------------------------------------------
Net Income 17,328,529
Change in unrealized gain
on marketable securities
(net of deferred tax of
$4,077,218) (7,220,144) (7,220,144)
Reclassification adjustment
for amounts included in
net income, (net of
income tax of $1,849,820) (3,275,755) (3,275,755)
Stock options exercised:
various prices per share 453,394
Purchase of treasury stock:
215,000 shares (4,100,350)
Income tax benefit from
exercise of non-qualified
stock options 16,451

Balance, December 31, 2001 $9,374,389 $437,627,556
- ---------------------------------------------------------------
</TABLE>

ADTRAN issued 37,956, 315,314 and 72,911 shares of Treasury Stock to accommodate
employee stock option exercises during 2001, 2000 and 1999, respectively.
Comprehensive income in 2001 of $6,832,630 consists of net income of $17,328,529
and unrealized losses on marketable securities of $10,495,899 (net of deferred
tax).
Comprehensive income in 2000 of $24,672,549 consists of net income of
$120,802,261 and unrealized losses on marketable securities of $96,129,712 (net
of deferred tax).
Comprehensive income in 1999 of $166,945,554 consists of net income of
$50,945,554 and unrealized gains on marketable securities of $116,000,000 (net
of deferred tax).
The accompanying notes are an integral part of these financial statements.

25
Statements of Cash Flows
Years ended December 31, 2001, 2000 and 1999

<TABLE>
<CAPTION>
2001 2000 1999
------------------------------------------------------
<S> <C> <C> <C>
Cash flows from operating activities
- ----------------------------------------------------------------------------------------------------------------------------
Net income $17,328,529 $120,802,261 $50,945,554
Adjustments to reconcile net income to net cash
provided by (used in) operating activities:
Depreciation 16,798,846 13,418,843 10,546,594
Gain on sale of property, plant and equipment (5,050)
Loss on sale of short-term investments 179,729 141,233 417,749
Gain on sale of long-term investments (5,159,414) (85,040,126)
Write-down of other equity and debt securities 5,653,536 1,000,000
Deferred income taxes (2,527,095) 16,411 (683,237)
Income tax benefit from exercise of non-qualified
stock options 16,451 3,002,720 318,690
Change in operating assets:
Accounts receivable 21,534,964 (22,096,955) (13,448,557)
Inventory, net 32,403,259 (30,683,956) 7,131,803
Other receivables 26,250,108 (31,430,079) (3,743,198)
Prepaid expenses and other assets 525,968 (2,871,152) (55,920)
Accounts payable (18,562,147) 21,339,984 1,793,751
Accrued expenses (838,391) 1,451,825 2,122,491
Income taxes payable (382,185) (2,362,225) 5,035,664
- ----------------------------------------------------------------------------------------------------------------------------
Net cash provided by (used in) operating activities 93,222,158 (13,311,216) 60,376,334
- ----------------------------------------------------------------------------------------------------------------------------
Cash flows from investing activities
- ----------------------------------------------------------------------------------------------------------------------------
Expenditures for property, plant and equipment (13,215,927) (32,540,097) (36,236,622)
Proceeds from the disposition of property, plant
and equipment 5,050
Proceeds from sale of long-term investments 36,281,649 91,118,394 3,893,832
Purchases of long-term investments (97,793,588) (37,027,741) (1,221,411)
Proceeds from sale of short-term investments 59,228,684 177,081,903 38,581,797
Purchases of short-term investments (53,544,339) (168,792,543) (39,285,254)
- ----------------------------------------------------------------------------------------------------------------------------
Net cash provided by (used in) investing activities (69,043,521) 29,839,916 (34,262,608)
- ----------------------------------------------------------------------------------------------------------------------------
Cash flows from financing activities
- ----------------------------------------------------------------------------------------------------------------------------
Proceeds from issuance of common stock 453,394 6,768,117 1,725,282
Purchase of treasury stock (4,100,350) (70,426) (325,991)
- ----------------------------------------------------------------------------------------------------------------------------
Net cash provided by (used in) financing activities (3,646,956) 6,697,691 1,399,291
- ----------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in cash and cash equivalents 20,531,681 23,226,391 27,513,017
Cash and cash equivalents, beginning of year 60,748,728 37,522,337 10,009,320
- ----------------------------------------------------------------------------------------------------------------------------
Cash and cash equivalents, end of year $81,280,409 $60,748,728 $37,522,337
- ----------------------------------------------------------------------------------------------------------------------------
Supplemental disclosure of cash flow information:
Cash paid during the year for interest $1,867,264 $1,802,158 $2,311,667
Cash paid during the year for income taxes $11,760,534 $61,760,406 $22,094,478
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

The accompanying notes are an integral part of these financial statements

26
NOTES TO FINANCIAL STATEMENTS

NOTE 1 - NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

ADTRAN, Inc. designs, develops, manufactures, markets, and services a broad
range of high-speed network access products utilized by providers of
telecommunications services (serviced by ADTRAN's Carrier Networks Division or
CN) and corporate end-users (serviced by ADTRAN's Enterprise Networks Division
or EN) to implement advanced digital data services over public and private
networks. ADTRAN also customize many of its products for private label
distribution and for original equipment manufacturers to incorporate into their
own products. Most of ADTRAN's CN and EN products are connected to the local
loop, which is the large existing infrastructure of the telephone network,
predominantly consisting of copper wireline, which connects end users to a
Central Office, the facility that provides local switching and distribution
functions. The balance of ADTRAN's products are used in the Central Office.

CASH AND CASH EQUIVALENTS

Cash and cash equivalents represent demand deposits, money market accounts and
short-term investments classified as held-to-maturity (see Note 2) with original
maturities of three months or less.

FINANCIAL INSTRUMENTS

The carrying amount reported in the balance sheets for cash and cash
equivalents, accounts receivable, and accounts payable approximate fair value
due to the immediate or short-term maturity of these financial instruments. The
carrying amount reported for the bonds payable approximates fair value because
the underlying instruments are at variable rates that re-price frequently.

Investments represent re-marketed preferred stocks, municipal bonds and
marketable equity securities. Re-marketed preferred stocks are designed to be
marketed as money market instruments. These instruments' dividend rates reset on
a short-term basis to maintain the price of the instruments at par. These
instruments may be redeemed on the date the interest rate resets. The fair value
of short-term investments is estimated based on quoted market prices (see Note
2). Realized gains or losses are computed under the specific identification
method.

Long-term investments represent restricted money market funds (see Note 2),
municipal bonds, marketable equity securities and other equity and debt
investments. The fair value of the restricted money market funds approximate
fair value due to a variable interest rate. Marketable equity securities are
reported at market value as determined by the most recently traded price of the
securities at the balance sheet date, although the securities may not be readily
marketable due to the size of the available market. Unrealized gains and losses,
net of tax, are reported as a separate component of stockholders' equity.
Realized gains and losses are computed under the specific identification method
and are included in current income.

OTHER RECEIVABLES

Other receivables are comprised primarily of accrued interest and amounts due
from subcontractors for raw material sales.

INVENTORY

Inventory is carried at the lower of cost or market, with cost being determined
using the first-in, first-out method.

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment, which is stated at cost, is depreciated using
methods which approximate straight-line depreciation over the estimated useful
lives of the assets. ADTRAN depreciates its building and land improvements from
five to thirty-nine years, office machinery and equipment from three to seven
years and its engineering machinery and equipment from three to seven years.
Expenditures for repairs and maintenance are charged to expense as incurred;
betterments which materially prolong the lives of the assets are capitalized.
The cost of assets retired or otherwise disposed of and the related accumulated
depreciation are removed from the accounts and the gain or loss on such
disposition is included in income.

LONG-LIVED ASSETS

ADTRAN evaluates long-lived assets used in operations for impairment whenever
events or changes in circumstances indicate that the carrying amount of an asset
may not be recoverable and the undiscounted cash flows estimated to be generated
by those assets are less than the assets' carrying values. An impairment loss
would be recognized in the amount by which the recorded value of the asset

27
exceeds the fair value of the asset, measured by the quoted market price of an
asset or an estimate based on the best information available in the
circumstances. There were no such losses recognized during 2001, 2000, and 1999.
ADTRAN does not expect the adoption of SFAS No.'s 141, 142, 143 and 144 to
impact this policy.

RESEARCH AND DEVELOPMENT COSTS

Research and development costs are expensed as incurred.

COMPREHENSIVE INCOME

Comprehensive Income consists of net income and unrealized gains and losses on
marketable securities, net of deferred taxes, and is presented in the Statements
of Changes in Stockholder's Equity.

INCOME TAXES

ADTRAN utilizes the asset and liability method of accounting for income taxes
which requires the establishment of deferred tax liabilities and assets, as
measured by enacted tax rates, for all temporary differences caused when the tax
bases of assets and liabilities differ from those reported in the financial
statements.

INTEREST IN SUBSIDIARY

ADTRAN consolidates ADTRAN AG, a Switzerland-based subsidiary, and reflected the
25% minority interest as minority interest in the accompanying balance sheet at
December 31, 2000. During 2001, ADTRAN purchased the 25% minority interest in
ADTRAN AG for am amount approximating its book value.

REVENUE RECOGNITION

Revenue is generally recognized upon shipment of the product to the customer or,
in the case of remote customer located warehouses, upon delivery to the
customer. Shipping fees are recorded as revenue and the related cost is included
in cost of sales. Revenue is recorded net of discounts. Also, revenue is
recorded when the product price is fixed and determinable, collection of the
resulting receivable is probable, and product returns are reasonably estimable.

EARNINGS PER SHARE

Earnings per common share, and earnings per common share assuming dilution, are
based on the weighted average number of common and, when dilutive, common
equivalent shares outstanding during the year (see Note 11).

USE OF ESTIMATES

The preparation of financial statements in conformity with accounting principles
generally accepted in the United States of America requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities, the disclosure of contingent assets and liabilities at the date of
the financial statements, and the reported amounts of revenue and expenses
during the reporting period. Actual results could differ from those estimates.

RECLASSIFICATIONS

Certain 2000 amounts have been reclassified to conform to the 2001 financial
statement presentation. These reclassifications had no effect on previously
reported net income, operating cash flows or total stockholders' equity.

RECENTLY ISSUED ACCOUNTING STANDARDS

In June 2001, the Financial Accounting Standards Board issued SFAS No. 141,
Business Combinations, which has an effective date of June 30, 2001 for all
business combinations initiated after this date. This statement requires all
business combinations within the scope of the Statement to be accounted for
using the purchase method of accounting. SFAS No. 141 does not currently impact
ADTRAN.

In June 2001, the Financial Accounting Standards Board issued SFAS No. 142,
Goodwill and Other Intangible Assets, which has an effective date starting with
fiscal years beginning after December 15, 2001. This statement addresses the
accounting for goodwill and other intangible assets. SFAS No. 142 does not
currently impact ADTRAN.

28
In August 2001, the Financial Accounting Standards Board issued SFAS No. 143,
Accounting for Asset Retirement Obligations ("ARO"), which has an effective date
for financial statements for fiscal years beginning after June 15, 2002. This
statement addresses the diversity in practice for recognizing asset retirement
obligations and requires that obligations associated with the retirement of
tangible long-lived asset be recorded as a liability when those obligations are
incurred, with the amount of the liability initially measured at fair value.
Upon initially recognizing a liability for an ARO, an entity must capitalize the
cost by recognizing an increase in the carrying amount of the related long-lived
asset. Over time, the liability is accreted to its present value each period,
and the capitalized cost is depreciated over the useful life of the related
asset. Upon settlement of the liability, an entity either settles the
obligations for its recorded amount or incurs a gain or loss upon settlement.
The impact of SFAS No. 143 is not expected to be material to the Company's
financial statements.

In October 2001, the Financial Accounting Standards Board issued SFAS No. 144,
Accounting for the Impairment or Disposal of Long-Lived Assets, which has an
effective date for financial statements for fiscal years beginning after
December 15, 2001. This statement, which supersedes SFAS No. 121, Accounting for
the Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed of,
requires that long-lived assets that are to be disposed of by sale be measured
at the lower of book value or fair value less cost to sell. Additionally, this
statement expands the scope of discounted operations to include all components
of an entity with operations that (i) can be distinguished from the rest of the
entity and (ii) will be eliminated from the ongoing operations of the entity in
a disposal transaction. The impact of SFAS No. 144 is not expected to be
material to the Company's financial statements.

NOTE 2 - INVESTMENTS

ADTRAN classifies its securities as either available-for-sale or
held-to-maturity. At December 31, 2001 and 2000, ADTRAN held the following
securities, recorded at either fair value or amortized cost, which approximates
fair value.

<TABLE>
<CAPTION>
December 31, 2001
- -----------------------------------------------------------------------------------------------------------------------------------
Cost or Gross Gross Fair
Amortized Cost Unrealized Gains Unrealized Losses Values
- -----------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C>
Available-for-sale securities:
- -----------------------------------------------------------------------------------------------------------------------------------
Restricted money market funds $50,000,000 $50,000,000
Municipal bonds 71,396,688 $242,072 ($684,961) 70,953,799
Marketable equity securities 19,004,225 16,872,101 (1,743,808) 34,132,518
Other equity securities 811,705 811,705
Total available-for-sale securities $141,212,618 $17,114,173 ($2,428,769) $155,898,022
- -----------------------------------------------------------------------------------------------------------------------------------
Held-to-maturity investments:
- -----------------------------------------------------------------------------------------------------------------------------------
Municipal bonds and other government
fixed income securities $25,972,779 $25,972,779
Other debt securities 2,313,877 2,313,877
Total held-to-maturity securities $28,286,656 $28,286,656
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
December 31, 2000
- -----------------------------------------------------------------------------------------------------------------------------------
Cost or Gross Gross Fair
Amortized Cost Unrealized Gains Unrealized Losses Values
- -----------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C>
Available-for-sale securities:
- -----------------------------------------------------------------------------------------------------------------------------------
Restricted money market funds $50,000,000 $50,000,000
Municipal bonds 15,055,318 $6,449 ($16,630) 15,045,137
Marketable equity securities 10,602,403 32,201,010 (690,220) 42,113,193
Other equity securities 5,809,808 5,809,808
Total available-for-sale securities $81,467,529 $32,207,459 ($706,850) $112,968,138
- -----------------------------------------------------------------------------------------------------------------------------------
Held-to-maturity investments:
- -----------------------------------------------------------------------------------------------------------------------------------
Municipal bonds and other government
fixed income securities $32,650,183 $32,650,183
Total held-to-maturity securities $32,650,183 $32,650,183
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

Gross realized gains on the sale of available-for-sale securities were
approximately $6,046,000 and gross realized losses were approximately $1,066,000
for the year ended December 31, 2001.

29
NOTE 3 - INVENTORY

At December 31, 2001 and 2000 inventory was comprised of the following:

<TABLE>
<CAPTION>
2001 2000
-----------------------------------------
<S> <C> <C>
Raw materials $32,838,488 $50,011,508
Work in process 5,154,555 12,606,275
Finished goods 18,856,427 26,634,946
- -----------------------------------------------------------------------------------------------------------------
$56,849,470 $89,252,729
</TABLE>

NOTE 4 - PROPERTY, PLANT AND EQUIPMENT

At December 31, 2001 and 2000, property, plant and equipment was comprised of
the following:

<TABLE>
<CAPTION>
2001 2000
-----------------------------------------
<S> <C> <C>
Land $ 4,263,104 $ 4,263,104
Building 70,151,495 67,810,999
Land improvements 14,430,404 14,452,983
Office machinery and equipment 49,890,659 43,496,263
Engineering machinery and equipment 51,490,165 47,112,131
- -----------------------------------------------------------------------------------------------------------------
190,225,827 177,135,480
Less accumulated depreciation (70,092,383) (53,422,304)
- -----------------------------------------------------------------------------------------------------------------
$120,133,444 $123,713,176
- -----------------------------------------------------------------------------------------------------------------
</TABLE>

NOTE 5 - ALABAMA STATE INDUSTRIAL DEVELOPMENT AUTHORITY FINANCING

In conjunction with an expansion of its Huntsville, Alabama facility, ADTRAN was
approved for participation in an incentive program offered by the State of
Alabama Industrial Development Authority (the "Authority"). Pursuant to the
program, on January 13, 1995, the Authority issued $20,000,000 of its taxable
revenue bonds and loaned the proceeds from the sale of the bonds to ADTRAN. The
bonds were originally purchased by AmSouth Bank of Alabama, Birmingham, Alabama
(the "Bank"). First Union National Bank of Tennessee, Nashville, Tennessee, (the
"Bondholder") purchased the original bonds from the Bank and made further
advances to the Authority bringing the total amount outstanding to $50,000,000.
An Amended and Restated Taxable Revenue Bond ("Amended and Restated Bond"), was
issued and the original financing agreement was amended. The Amended and
Restated Bond bears interest, payable monthly. In 2001, the interest rate was 45
basis points above the money market rate of the Bondholder through September 30.
During the fourth quarter the interest rate was 45 basis points above the
certificate of deposit rate of the Bondholder. The Amended and Restated Bond
matures on January 1, 2020. ADTRAN is required to make payments to the Authority
in amounts necessary to pay the principal of and interest on the Amended and
Restated Bond. Included in long-term investments is $50,000,000, which is
restricted money market funds, which is a collateral deposit against the
principal of this bond.

NOTE 6 - INCOME TAXES

A summary of the components of the provision for income taxes as of December 31,
2001, 2000 and 1999 are as follows:

<TABLE>
<CAPTION>
2001 2000 1999
----------------------------------------------------
<S> <C> <C> <C>
Current
Federal $6,919,148 $58,300,783 $24,764,291
State 2,016,912 3,914,293 2,163,623
- -----------------------------------------------------------------------------------------------------------------
Total Current 8,936,059 62,215,076 26,927,914
Deferred tax provision (benefit) (2,527,095) 16,411 (683,237)
- -----------------------------------------------------------------------------------------------------------------
Total provision for income taxes $6,408,965 $62,231,487 $26,244,677
</TABLE>

30
The provision for income taxes differs from the amounts computed by applying the
Federal statutory rate due to the following:

<TABLE>
<CAPTION>
2001 2000 1999
---------------------------------------------------
<S> <C> <C> <C>
Tax provision computed at the Federal statutory rate
(35% in 2001, 2000 and 1999) $8,307,916 $64,061,831 $27,016,582
State income tax provision, net of Federal benefit 988,075 2,544,290 1,406,353
Federal research credits (2,386,068) (2,970,013) (1,880,205)
Tax exempt income (897,771) (1,060,586)
Other 396,813 (344,035) (298,053)
- -----------------------------------------------------------------------------------------------------------------
$6,408,965 $62,231,487 $26,244,677
</TABLE>

Temporary differences which create deferred tax assets and liabilities at
December 31, 2001 and 2000 are as follows:

<TABLE>
<CAPTION>
2001 2000
---------------------------------------------------------------
Current Non-current Current Non-current
<S> <C> <C> <C> <C>
Accumulated depreciation ($5,310,950) ($4,611,379)
Investments (2,972,651) (10,731,056)
Accounts receivable $1,644,845 $303,413
Inventory 2,735,264 2,230,423
Accruals 1,524,646 1,371,763
Suspended research and development credit 599,409
- ----------------------------------------------------------------------------------------------------------------
Deferred tax asset (liability) $5,904,755 ($8,283,601) $4,505,008 ($15,342,435)
</TABLE>

No valuation allowance is deemed necessary by management, as the realization of
recorded deferred tax assets is considered more likely than not.

NOTE 7 - STOCK OPTION PLANS

The Board of Directors of ADTRAN adopted the 1996 Employees Incentive Stock
Option Plan (the "1996 Plan") effective February 14, 1996, as amended, under
which 8,488,100 shares of common stock were reserved for issuance to certain
employees and officers through incentive stock options and non-qualified stock
options. ADTRAN currently has options outstanding under its 1986 Employee
Incentive Stock Option Plan (the "1986 Plan"), which expired on February 14,
1996. Options granted under the 1996 Plan or the 1986 Plan become exercisable
after one year of continued employment, normally pursuant to a five-year vesting
schedule beginning on the first anniversary of the grant date. In 2000, the
Board of Directors voted to reduce the vesting schedule to four years beginning
on the first anniversary of the grant date for new grants effective January
2000. Expiration dates of options outstanding under the 1996 Plan and the 1986
Plan at December 31, 2001 range from 2002 to 2011.

The Board of Directors of ADTRAN adopted the Directors Stock Option Plan
("Directors Plan") effective October 31, 1995, as amended, under which 200,000
shares of common stock have been reserved. The Directors Plan is a formula plan
to provide options to directors of ADTRAN. At December 31, 2001, 92,000 options
had been granted under the Directors Plan. Expiration dates of options
outstanding under the Directors Plan at December 31, 2001 range from 2005 to
2011.

31
Pertinent information regarding the Company's stock option plans is as follows:

<TABLE>
<CAPTION>
Number of Range of Exercise Weighted Average Vesting
Options Prices Exercise Price Provisions
- ------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C>
Options outstanding, December 31, 1998 2,179,786 $.50 - $65.75 $27.78 Various
- ------------------------------------------------------------------------------------------------------------------------
Options granted 520,000 $18.13 - $39.69 $35.75 Various
Options granted 642,000 $18.88 - $65.75 $36.05 Various
Options cancelled (153,225) $21.28 - $65.75 $32.52 Various
Options exercised (96,076) $.50 - $31.75 $17.96 Various
- ------------------------------------------------------------------------------------------------------------------------
Options outstanding, December 31, 1999 3,092,485 $1.50 - $65.75 $30.88 Various
- ------------------------------------------------------------------------------------------------------------------------
Options granted 779,415 $39.00 - $69.81 $67.82 Various
Options granted 616,185 $21.25 - $69.81 $67.12 Various
Options cancelled (155,710) $18.13 - $69.81 $37.36 Various
Options exercised (315,314) $1.50 - $65.75 $21.47 Various
- ------------------------------------------------------------------------------------------------------------------------
Options outstanding, December 31, 2000 4,017,061 $1.67 - $69.81 $44.02 Various
- ------------------------------------------------------------------------------------------------------------------------
Options granted 1,442,890 $19.23 - $28.08 $25.54 Various
Options cancelled (266,746) $21.31 - $69.81 $44.04 Various
Options exercised (36,670) $1.67 - $25.38 $12.36 Various
- ------------------------------------------------------------------------------------------------------------------------
Options outstanding, December 31, 2001 5,156,535 $1.67 - $69.81 $27.31 Various
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

The following table summarizes information about stock options outstanding at
December 31, 2001:

OPTIONS OUTSTANDING

<TABLE>
<CAPTION>
Weighted
Average Weighted Weighted
Range of Number Remaining Average Number Average
Exercise Prices Outstanding Contractual Life Exercise Price Exercisable Exercise Price
<S> <C> <C> <C> <C> <C>
$2.50 - $3.33 14,570 1.72 $3.15 14,570 $3.15
$18.13 - $21.31 739,715 6.77 $21.19 419,030 $21.16
$21.81 - $27.50 1,859,706 8.46 $25.40 373,936 $25.27
$28.06 - $46.25 1,106,990 7.28 $35.90 438,334 $36.42
$49.56 - $69.81 1,435,554 7.83 $68.36 541,358 $67.07
- --------------------------------------------------------------------------------------------------------------------------
5,156,535 1,787,228
</TABLE>

The options above were issued at exercise prices which approximate fair market
value at the date of grant. At December 31, 2001, 3,268,996 options were
available for grant under the plans. ADTRAN applies APB Opinion No. 25 and
related interpretations in accounting for our stock option plans. Accordingly,
no compensation cost has been recognized related to stock options. Had
compensation cost for ADTRAN's stock-based compensation plans been determined
based on the fair value at the grant dates for awards under those plans
consistent with the method prescribed in SFAS No. 123, net income and earnings
per share would have been reduced to the pro forma amounts indicated below:

PRO FORMA NET INCOME & EARNINGS PER SHARE

<TABLE>
<CAPTION>
2001 2000 1999
------------------------------------------------------------------
<S> <C> <C> <C>
Net income - as reported $17,328,529 $120,802,261 $50,945,554
Net income - pro forma (540,238) 108,525,119 44,903,017
Earnings per share - as reported
assuming dilution $.45 $3.04 $1.31
Earnings per share - pro forma assuming
dilution ($.01) $2.73 $1.16
</TABLE>

32
The pro forma amounts reflected above are not representative of the effects on
reported net income in future years because, in general, the options granted
typically do not vest for several years and additional awards are made each
year. The fair value of each option grant is estimated on the grant date using
the Black-Scholes option-pricing model with the following weighted-average
assumptions:

WEIGHTED AVERAGE ASSUMPTIONS

2001 2000 1999
--------------------------
Dividend yield 0% 0% 0%
Expected life (years) 5 5 6
Expected volatility 53.1% 55.4% 59.4%
Risk-free interest rate 4.72% 6.18% 5.69%

NOTE 8 - EMPLOYEE BENEFIT PLAN

Effective January 1, 1990, ADTRAN adopted a savings plan (the "Savings Plan")
for the benefit of eligible employees. The Savings Plan allows employees to
contribute part of their compensation to the plan on a tax-deferred basis, and
requires ADTRAN to contribute an amount equal to 3% of compensation each year
for eligible employees who have completed a year of service. The Savings Plan is
intended to qualify under Sections 401(a) and 401(k) of the Internal Revenue
Code of 1986, as amended (the "Code"), and is intended to be a "safe harbor"
401(k) plan under code Section 401(k)(12). Prior to January 1, 2001, ADTRAN
contributed matching contributions in an amount equal to 50% of each eligible
employees elective deferrals under the Savings Plan, up to 5% of the employee's
compensation for the plan year. All contributions under the Savings Plan are
100% vested. Charges to operations for the Savings Plan amounted to
approximately $2,456,000, $1,368,000, $1,288,000, in 2001, 2000 and 1999,
respectively.

NOTE 9 - SEGMENT INFORMATION AND MAJOR CUSTOMERS

ADTRAN, Inc. operates two reportable segments - (1) Carrier Networks (CN) and
(2) Enterprise Networks (EN). The accounting policies of the segments are the
same as those described in the "Summary of Significant Accounting Policies" (see
Note 1) to the extent that such policies affect the reported segment
information. ADTRAN evaluates the performance of its segments based on gross
profit; therefore, selling, general and administrative costs, as well as
research and development, interest income/expense, and provision for taxes, is
reported on an entity-wide basis only. There are no inter-segment revenues.

The following table presents information about the reported sales and gross
profit of ADTRAN for each of the years ended December 31, 2001, 2000 and 1999.
Asset information by reportable segment is not reported, since ADTRAN does not
produce such information internally.

SALES BY MARKET SEGMENT
(In Thousands)

<TABLE>
<CAPTION>
2001 2000 1999
---------------------------------------------------------------------------------------------------
Sales Gross Profit Sales Gross Profit Sales Gross Profit
---------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C>
CN $238,367 $ 93,643 $315,228 $ 146,886 $230,967 $ 108,809
EN 148,714 79,677 147,721 82,633 136,240 79,769
- ----------------------------------------------------------------------------------------------------------------------
Total $387,081 $173,320 $462,949 $229,519 $367,207 $188,578
</TABLE>

33
The following is sales information by product and geographic area for the years
ended December 31, 2001, 2000 and 1999:

SALES BY PRODUCT
(In Thousands)

<TABLE>
<CAPTION>
2001 2000 1999
----------------------------------------------------------------
<S> <C> <C> <C>
Digital Business Transport (DBT) / Total Reach(R) $86,794 $141,996 $133,064
High-bit-rate Digital Subscriber Line (HDSL) / T1 192,850 233,073 203,894
Systems 107,437 87,880 30,249
- ---------------------------------------------------------------------------------------------------------------------------------
Total $387,081 $462,949 $367,207
</TABLE>

<TABLE>
<CAPTION>
SALES BY GEOGRAPHIC REGION
(In Thousands)
2001 2000 1999
----------------------------------------------------------------
<S> <C> <C> <C>
United States $369,422 $448,810 $357,699
Foreign 17,659 14,139 9,508
- ---------------------------------------------------------------------------------------------------------------------------------
Total $387,081 $462,949 $367,207
</TABLE>

Sales of ADTRAN's network access equipment to the Regional Bell Operating
Companies (RBOCs) and GTE, also known as Incumbent Local Exchange Carriers
(ILECs), amounted to approximately 59%, 56% and 55% of total sales during the
years ended December 31, 2001, 2000 and 1999, respectively. ADTRAN's EN Division
sells a significant portion of our products to value-added resellers through a
multi-tier distribution system. Sales of this type amounting to 26%, 26%, and
27% of ADTRAN's revenue for each of the years ended December 31, 2001, 2000 and
1999, respectively, were routed through four primary fulfillment distributors.

NOTE 10 - COMMITMENTS AND CONTINGENCIES

ADTRAN has certain contingent liabilities resulting from litigation arising in
the normal course of business. Although the outcome of any litigation can never
be certain, it is ADTRAN's opinion that the outcome of such contingencies will
not materially affect its business, operations, financial condition or cash
flows.

ADTRAN leases office space and equipment under operating leases which expire at
various dates through 2003. As of December 31, 2001, future minimum rental
payments under non-cancellable operating leases are approximately as follows:

2002 $438,000
2003 110,000
- ------------------------------------------------------------------------------
Total $548,000
- ------------------------------------------------------------------------------

Rental expense was approximately $754,000, $846,000 and $988,000 in 2001, 2000
and 1999, respectively.

34
NOTE 11 - EARNINGS PER SHARE

A summary of the calculation of basic and diluted earnings per share (EPS) for
the years ended December 31, 2001, 2000 and 1999 is as follows:

<TABLE>
<CAPTION>
For the Year Ended December 31, 2001
---------------------------------------------------------------
Income Shares Per-Share
(Numerator) (Denominator) Amount
<S> <C> <C> <C>
Basic EPS
- ----------------------------------------------------------------------------------------------------------------------
Income available to common stockholders $17,328,529 38,567,324 $.45

Effect of Dilutive Securities
- ----------------------------------------------------------------------------------------------------------------------
Stock Options 108,863

Diluted EPS
- ----------------------------------------------------------------------------------------------------------------------
Income available to common stockholders
(with dilution) for assumed options exercised $17,328,529 38,676,187 $.45
</TABLE>

<TABLE>
<CAPTION>
For the Year Ended December 31, 2000
---------------------------------------------------------------
Income Shares Per-Share
(Numerator) (Denominator) Amount
<S> <C> <C> <C>
Basic EPS
- ----------------------------------------------------------------------------------------------------------------------
Income available to common stockholders $120,802,261 38,647,288 $3.13

Effect of Dilutive Securities
- ----------------------------------------------------------------------------------------------------------------------
Stock Options 1,056,998

Diluted EPS
- ----------------------------------------------------------------------------------------------------------------------
Income available to common stockholders
(with dilution) for assumed options exercised $120,802,261 39,704,286 $3.04*
</TABLE>

<TABLE>
<CAPTION>
For the Year Ended December 31, 1999
---------------------------------------------------------------
Income Shares Per-Share
(Numerator) (Denominator) Amount
<S> <C> <C> <C>
Basic EPS
- ----------------------------------------------------------------------------------------------------------------------
Income available to common stockholders $50,945,554 38,334,507 $1.33

Effect of Dilutive Securities
- ----------------------------------------------------------------------------------------------------------------------
Stock Options 496,584

Diluted EPS
- ----------------------------------------------------------------------------------------------------------------------
Income available to common stockholders
(with dilution) for assumed options exercised $50,945,554 38,831,091 $1.31
</TABLE>

*ADTRAN reported a realized investment gain from the sale of certain marketable
equity securities, resulting in an after-tax gain of $55,410,000 ($1.39 per
share assuming dilution). Earnings on a per share basis before the realized
investment gain, assuming dilution, for the twelve months ended December 31,
2000 was $1.65.

35
The following options were outstanding during the respective years shown below,
but were not included in the computation of that year's diluted EPS because the
options' exercise price was greater than the average market price of the common
shares shown below.

OUTSTANDING OPTIONS

<TABLE>
<CAPTION>
2001 2000 1999
- ----------------------------------------- ------------------------------------------- ------------------------------------------
Options Exercise Options Exercise Options Exercise
Granted Price Expiration Granted Price Expiration Granted Price Expiration
<S> <C> <C> <C> <C> <C> <C> <C> <C>
34,450 $30.50-$46.25 2005 226,400 $56.25-$65.75 2006 46,000 $31.75-$46.25 2005
220,800 $39.75-$65.75 2006 4,000 $65.75 2009 276,000 $39.75-$65.75 2006
472,566 $25.38-$42.38 2007 1,316,150 $40.00-$69.81 2010 23,100 $37.88-$42.72 2007
11,675 $26.25-$31.00 2008 1,083,710 $36.06-$51.44 2009
967,140 $25.38-$51.44 2009
1,274,364 $39.00-$69.81 2010
1,396,090 $25.34-$28.08 2011
</TABLE>

NOTE 12 - SUMMARIZED QUARTERLY FINANCIAL DATA (UNAUDITED)

The following table presents unaudited quarterly operating results for each of
ADTRAN's last eight fiscal quarters. This information has been prepared by
ADTRAN on a basis consistent with our audited financial statements and includes
all adjustments, consisting only of normal recurring adjustments, considered
necessary for a fair presentation of the data.

UNAUDITED QUARTERLY OPERATING RESULTS
(In thousands, except for per share amounts)

<TABLE>
<CAPTION>
Three Months Ended March 31, 2001 June 30, 2001 September 30, 2001 December 31, 2001
- ---------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C>
Net sales $105,276 $97,198 $95,513 $89,094
Gross profit 45,434 45,559 42,399 39,929
Operating income 4,521 5,796 5,098 3,017
Net income 3,959 4,637 4,950 3,783
/(1)/ Earnings per common share assuming $.10 $.12 $.13 $.10
dilution
Earnings per common share $.10 $.12 $.13 $.10
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
Three Months Ended March 31, 2000 June 30, 2000 September 30, 2000 December 31, 2000
- ---------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C>
Net sales $99,470 $114,447 $127,277 $121,755
Gross profit 54,404 61,670 65,953 47,492
Operating income 24,470 27,249 30,219 9,837
/(2)/ Net income 16,794 18,648 76,868 8,493
/(1)/ Earnings per common share assuming $.42 $.47 $1.93 $.22
dilution
Earnings per common share $.44 $.48 $1.99 $.22
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

/(1)/ Assumes exercise of dilutive stock options calculated under the treasury
stock method.
/(2)/ Net Income for Q3 2000 includes the realized gain from the sale of certain
marketable equity securities, resulting in an after-tax gain of $55,410,000.

NOTE 13 - SUBSEQUENT EVENT

On January 28, 2002, the Company's Board of Directors approved a voluntary stock
option exchange program for its employees, executive officers and directors. In
conjunction with the exchange offer, the Company filed a Tender Offer Statement
on Schedule TO with the Securities and Exchange Commission. Under the option
exchange program, holders of options to purchase the Company's common stock who
have not received options after July 23, 2001 will be given the opportunity to
exchange unexercised stock options granted prior to September 30, 2000 with
exercises prices of at least $40 per share. For every four shares of an eligible
option, three

36
shares will be made available under the new option grant. The new grant will be
no earlier than six months and two days after the expiration of the offer to
exchange, and the exercise price of the new options will equal the last
reported trading price of the Company's common stock on the new grant date.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE
- --------------------------------------------------------------------------------

No independent certified public accountant of ADTRAN has resigned, indicated any
intent to resign or been dismissed as the independent certified public
accountant of ADTRAN during the three fiscal years ended December 31, 2001 or
subsequent thereto.

PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
- --------------------------------------------------------------------------------

Information relating to nominees for director of ADTRAN and compliance with
Section 16(a) of the Securities Exchange Act of 1934 is set forth under the
captions "Proposal 1-Election of Directors-Information Regarding Nominees for
Director" and "Section 16(a) Beneficial Ownership Reporting Compliance,"
respectively, in the Proxy Statement for the Annual Meeting of Stockholders to
be held on April 16, 2002. Such information is incorporated herein by reference.
The definitive Proxy Statement was filed with the Securities and Exchange
Commission on March 11, 2002. Information relating to the executive officers of
ADTRAN, pursuant to Instruction 3 of Item 401(b) of Regulation S-K and General
Instruction G(3) of Form 10-K, is set forth at Part I, Item 4(A) of this report
under the caption "Executive Officers of the Registrant." Such information is
incorporated herein by reference.

ITEM 11. EXECUTIVE COMPENSATION
- --------------------------------------------------------------------------------

Information relating to executive compensation is set forth under the caption
"Executive Compensation" in the Proxy Statement referred to in Item 10 above.
Such information is incorporated herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
- --------------------------------------------------------------------------------

Information relating to ownership of common stock of ADTRAN by certain persons
is set forth under the caption "Share Ownership of Principal Stockholders and
Management" in the Proxy Statement referred to in Item 10 above. Such
information is incorporated herein by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
- --------------------------------------------------------------------------------

Information relating to existing or proposed relationships or transactions
between ADTRAN and any affiliate of ADTRAN is set forth under the captions
"Compensation Committee Interlocks and Insider Participation" and "Certain
Relationships and Related Transactions" in the Proxy Statement referred to in
Item 10 above. Such information is incorporated herein by reference.

37
PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K
- --------------------------------------------------------------------------------

(a) Documents Filed as Part of This Report.

1. Financial Statements

The financial statements of ADTRAN and the related report of
independent auditors thereon are set forth under Part II, Item
8 of this report.

Balance Sheets as of December 31, 2001 and 2000

Statements of Income for the years ended December 31, 2001,
2000 and 1999

Statements of Changes in Stockholders' Equity for the years
ended December 31, 2001, 2000 and 1999

Statements of Cash Flows for the years ended December 31,
2001, 2000 and 1999

Notes to Financial Statements

2. Financial Statement Schedules

Schedule II - Valuation and Qualifying Accounts

3. Exhibits

The following exhibits are filed with or incorporated by reference in this
report. Where such filing is made by incorporation by reference to a previously
filed registration statement or report, such registration statement or report
is identified in parentheses. We will furnish any exhibit upon request to:
ADTRAN, Inc., Attn: Investor Relations, P.O. Box 140000, 901 Explorer
Boulevard, Huntsville, Alabama 35814. There is a charge of $.50 per page to
cover expenses for copying and mailing.

Exhibit
Number Description
------- -----------

3.1 Certificate of Incorporation, as amended (Exhibit 3.1 to ADTRAN's
Registration Statement on Form S-1, No. 33-81062 (the "Form S-1
Registration Statement")).

3.2 Bylaws, as amended (Exhibit 3.2 to ADTRAN's Annual Report on Form
10-K for the year ended December 31, 2000).

10.1 Documents relative to the $50,000,000 Taxable Revenue Bond,
Series 1995 (ADTRAN, Inc. Project) issued by the Alabama State
Industrial Development Authority, consisting of the following
(Exhibit 10.1 to ADTRAN's Quarterly Report on Form 10-Q for the
quarter ended March 31, 1997 (the "1997 Form 10-Q")):

(a) First Amended and Restated Financing Agreement dated
April 25, 1997, among the State Industrial Development
Authority, a public corporation organized under the laws
of the State of Alabama (the "Authority"), ADTRAN and
First Union National Bank of Tennessee, a national
banking corporation (the "Bondholder");

(b) First Amended and Restated Loan Agreement dated April 25,
1997, between the Authority and ADTRAN;

(c) First Amended and Restated Specimen Taxable Revenue Bond,
Series 1995 (ADTRAN, Inc. Project);

(d) First Amended and Restated Specimen Note from ADTRAN to the
Bondholder, dated April 25, 1997;

(e) Investment Agreement dated April 25, 1997 among ADTRAN, the
Bondholder and AmSouth Bank of Alabama, an Alabama banking
corporation;

38
Exhibit
Number Description
------- -----------

(f) Resolution of the Authority authorizing the amendment of
certain documents, dated April 25, 1997, relating to the
$50,000,000 Taxable Revenue Bond, Series 1995 (ADTRAN, Inc.
Project);

(g) Resolution of ADTRAN authorizing the First Amended and
Restated Financing Agreement, the First Amended and
Restated Loan Agreement, the First Amended and Restated
Note, and the Investment Agreement.

10.2 Tax Indemnification Agreement dated July 1, 1994 by and among
ADTRAN and the stockholders of ADTRAN prior to ADTRAN's initial
public offering of Common Stock (Exhibit 10.5 to the 1994 Form
10-K).

10.3 Management Contracts and Compensation Plans:

(a) 1996 Employees Stock Incentive Plan (Exhibit 10.4 to
ADTRAN's Annual Report on Form 10-K for the year ended
December 31, 1995 (the "1995 Form 10-K")).

(b) 1995 Directors Stock Incentive Plan (Exhibit 10.4 to 1995
Form 10-K).

(c) Offer to Exchange dated January 28, 2002 (Exhibit
(a)(1)(A) to ADTRAN's Tender Offer Statement on Schedule
TO (the "Schedule TO") filed on January 28, 2002, as
amended by Amendment No. 1 to Schedule TO filed on
February 13, 2002).

(d) Form of Election Form Concerning Exchange of Stock
Options (Exhibit (a)(1)(B) to the Schedule TO filed on
January 28, 2002, as amended by Amendment No. 1 to
Schedule TO filed on February 13, 2002).

*23 Consent of PricewaterhouseCoopers LLP

*24 Powers of Attorney

*Filed herewith
- ---------------

(b) Reports on Form 8-K. None

39
SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the Registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized on March 28, 2002.

ADTRAN, Inc.
(Registrant)

By:/s/ James E. Matthews
----------------------
James E. Matthews

Senior Vice President - Finance,
Chief Financial Officer and Treasurer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the Registrant and
in the capacities indicated on March 28, 2002.

Signature Title
- --------- -----

/s/ Mark C. Smith Chairman of the Board, Chief
- --------------------------- Executive Officer and Director
Mark C. Smith

/s/ Howard A. Thrailkill President, Chief Operating Officer
- --------------------------- and Director
Howard A. Thrailkill

/s/ Lonnie S. McMillian* Secretary and Director
- ---------------------------
Lonnie S. McMillian

/s/ Richard A. Anderson* Director
- ---------------------------
Richard A. Anderson

/s/ W. Frank Blount* Director
- ---------------------------
W. Frank Blount

/s/ William L. Marks* Director
- ---------------------------
William L. Marks

/s/Roy J. Nichols* Director
- ---------------------------
Roy J. Nichols

/s/ James L. North* Director
- ---------------------------
James L. North

/s/ James E. Matthews Senior Vice President-Finance,
- --------------------------- Chief Financial Officer and Treasurer
James E. Matthews

*By:/s/Howard A. Thrailkill
------------------------
Howard A. Thrailkill
as Attorney in Fact

40
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS

<TABLE>
<CAPTION>
Balance at Balance
Beginning of at end of
Period Additions Deductions Period
<S> <C> <C> <C> <C>
Year ended December 31, 2001
- -------------------------------------------------------------------------------------------------------------
Allowance for Doubtful Accounts $813,003 $3,253,914 $184,818 $3,882,099
Inventory Reserve $4,637,682 $5,388,061 $4,422,823 $5,602,920
Warranty Liability $1,519,945 $3,718,882 $3,962,074 $1,276,753

Year ended December 31, 2000
- -------------------------------------------------------------------------------------------------------------
Allowance for Doubtful Accounts $1,018,400 $20,578 $225,975 $813,003
Inventory Reserve $5,306,503 $6,347,345 $7,016,167 $4,637,682
Warranty Liability $1,519,945 $3,326,866 $3,326,866 $1,519,945

Year ended December 31, 1999
- -------------------------------------------------------------------------------------------------------------
Allowance for Doubtful Accounts $958,805 $400,215 $340,620 $1,018,400
Inventory Reserve $1,148,731 $6,006,173 $1,848,401 $5,306,503
Warranty Liability $1,519,945 $2,501,073 $2,501,073 $1,519,945
</TABLE>

41
ADTRAN, INC.
INDEX OF EXHIBITS

Exhibit
Number Description
------- -----------

3.1 Certificate of Incorporation, as amended (Exhibit 3.1 to ADTRAN's
Registration Statement on Form S-1, No. 33-81062 (the "Form S-1
Registration Statement")).

3.2 Bylaws, as amended (Exhibit 3.2 to ADTRAN's Annual Report on Form
10-K for the year ended December 31, 2000).

10.1 Documents relative to the $50,000,000 Taxable Revenue Bond,
Series 1995 (ADTRAN, Inc. Project) issued by the Alabama State
Industrial Development Authority, consisting of the following
(Exhibit 10.1 to ADTRAN's Quarterly Report on Form 10-Q for the
quarter ended March 31, 1997 (the "1997 Form 10-Q")):

(a) First Amended and Restated Financing Agreement dated April
25, 1997, among the State Industrial Development
Authority, a public corporation organized under the laws
of the State of Alabama (the "Authority"), ADTRAN and
First Union National Bank of Tennessee, a national banking
corporation (the "Bondholder");

(b) First Amended and Restated Loan Agreement dated April 25,
1997, between the Authority and ADTRAN;

(c) First Amended and Restated Specimen Taxable Revenue Bond,
Series 1995 (ADTRAN, Inc. Project);

(d) First Amended and Restated Specimen Note from ADTRAN to the
Bondholder, dated April 25, 1997;

(e) Investment Agreement dated April 25, 1997 among ADTRAN, the
Bondholder and AmSouth Bank of Alabama, an Alabama banking
corporation;

(f) Resolution of the Authority authorizing the amendment of
certain documents, dated April 25, 1997, relating to the
$50,000,000 Taxable Revenue Bond, Series 1995 (ADTRAN, Inc.
Project);

(g) Resolution of ADTRAN authorizing the First Amended and
Restated Financing Agreement, the First Amended and
Restated Loan Agreement, the First Amended and Restated
Note, and the Investment Agreement.

10.2 Tax Indemnification Agreement dated July 1, 1994 by and among
ADTRAN and the stockholders of ADTRAN prior to ADTRAN's initial
public offering of Common Stock (Exhibit 10.5 to the 1994 Form
10-K).

10.3 Management Contracts and Compensation Plans:

(a) 1996 Employees Stock Incentive Plan (Exhibit 10.4 to
ADTRAN's Annual Report on Form 10-K for the year ended
December 31, 1995 (the "1995 Form 10-K")).

(b) 1995 Directors Stock Incentive Plan (Exhibit 10.4 to 1995
Form 10-K).

(c) Offer to Exchange dated January 28, 2002 (Exhibit
(a)(1)(A) to ADTRAN's Tender Offer Statement on Schedule
TO (the "Schedule TO") filed on January 28, 2002, as
amended by Amendment No. 1 to Schedule TO filed on
February 13, 2002).

(d) Form of Election Form Concerning Exchange of Stock Options
(Exhibit (a)(1)(B) to the Schedule TO filed on January 28,
2002, as amended by Amendment No. 1 to Schedule TO filed
on February 13, 2002).

42
Exhibit
Number Description
------- -----------

*23 Consent of PricewaterhouseCoopers LLP
*24 Powers of Attorney

*Filed herewith
--------------

43