Washington, D. C. 20549

                                   FORM 8-K/A

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

       Date of Report (Date of earliest event reported): January 22, 2007

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

          Delaware                      0-24612                63-0918200
  (State of Incorporation)      (Commission file number)    (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)

Check the appropriate box below if the Form 8-K/A filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

|_| Written communications pursuant to Rule 425 under the Securities Act
    (17 CFR 230.425)

|_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act
    (17 CFR 240.14a-12)

|_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))

|_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))

Explanatory Note:
This 8-K is being amended to correct the subcategory revenue amounts for the
first quarter of 2005 as presented in the table Product Revenues Based on New
Categories furnished as Exhibit 99.2

Item 2.02.  Results of Operations and Financial Condition.

On January 22, 2007, ADTRAN, Inc. announced its financial results for the fourth
quarter ended December 31, 2006 and certain other information. ADTRAN also
announced that its Board of Directors declared a quarterly cash dividend. The
quarterly cash dividend is $0.09 per common share to be paid to holders of
record at the close of business on February 8, 2007. The ex-dividend date is
February 6, 2007 and the payment date is February 22, 2007. A copy of ADTRAN's
press release announcing such financial results and other information is
attached as Exhibit 99.1 hereto and incorporated by reference herein.

On January 23, 2007, ADTRAN, Inc. announced it would begin reporting new product
categories in order to increase transparency in major product areas. The new
product categories to be reported will be Loop Access, Carrier Systems and
Business Networking.

Loop Access products are used by carrier and enterprise customers for access to
today's copper-based telecommunications network. Loop Access will be comprised
of DDS and ISDN Total reach products, HDSL products including TA 3000 based HSDL
and TDM-SHDSL products, T1and T3-TSUs, CSUs/DSUs, and Tracer fixed wireless

Carrier Systems products are used by carrier customers for increasing bandwidth
and for delivery of carrier services to consumers and enterprises. Carrier
Systems will be comprised of all Broadband Access products, including DSLAM
products and Total Access 5000 products. This category will also include the
OPTI family and other Optical Access products, Total Access 1500 systems, 303
concentrator products, M13 multiplexer products, and wireless backhaul grooming

Business Networking products provide enterprises access to today's
telecommunication networks and facilitate networking capabilities for voice and
data. Business Networking will be comprised of Atlas integrated access devices,
Total Access Integrated Access devices, and Internetworking products.
Internetworking products will be comprised of our NetVanta product line and IP
Business Gateways.

Additionally, we will provide sub-categories of product revenues for Broadband
Access and Optical Access (included in Carrier Systems) and Internetworking
products (included in Business Networking) to provide greater transparency of
our primary growth areas. Also, we will provide HDSL revenue (included in Loop
Access) as a sub-category.

To assist in future analysis of each of these categories, results by new product
category for the most recent ten quarters are attached as Exhibit 99.2 hereto
and incorporated by reference herein.

Item 9.01.  Financial Statements and Exhibits.

              (c)  Exhibits.

              The following exhibit is furnished as part of this Current Report
              on Form 8-K.

Exhibit Number            Description
--------------            -----------
          99.1            Press Release dated January 22, 2007.
          99.2            Revenue results for most recent ten quarters by new
                          product classification methods.


              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 January
22, 2007.

                                   ADTRAN, Inc.

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

                                  EXHIBIT INDEX

Exhibit Number            Description
--------------            -----------
          99.1            Press Release dated January 22, 2007.
          99.2            Revenue results for most recent ten quarters by new
                          product classification methods.