APPLIED DIGITAL ACCESS INC
SC 13G/A, 1999-05-10
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934
                           (Amendment No. 1)*
                                         --      



                         APPLIED DIGITAL ACCESS, INC.
                         ----------------------------
                               (Name of Issuer)

                        Common Stock (Par Value $0.001)
                        -------------------------------
                        (Title of Class of Securities)

                                   038181103
                                   ---------
                                (CUSIP Number)

Check the following box if a fee is being paid with this statement [_].
(A fee is not required only if the filing person: (1) has a previous statement
on file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such
class.)(See Rule 13d-7.)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



                        (Continued on following pages)
                               Page 1 of 6 Pages
<PAGE>
 
CUSIP No. 038181103                                                 Page 2 of 6


1.  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Brown Investment Advisory & Trust Company ("BIATC"), its wholly owned
         subsidiary, Brown Advisory Incorporated ("BAI").  52-1811121

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
         (a) [_]
         (b) [x]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

    Brown Investment Advisory & Trust Company and Brown Advisory Incorporated
    are Maryland corporations.

NUMBER OF          5 SOLE VOTING POWER
SHARES             BIATC            0 shares
                   BAI         15,000 shares
                               ------
                               15,000 shares


BENEFICIALLY       6 SHARED VOTING POWER
OWNED BY           BIATC            0 shares
                   BAI              0 shares
                               ------
                                    0 shares


EACH REPORTING     7 SOLE DISPOSITIVE POWER
PERSON WITH        BIATC            0 shares
                   BAI         15,000 shares
                               ------
                               15,000 shares


                   8 SHARED DISPOSITIVE POWER
                   BIATC            0 shares
                   BAI              0 shares
                               ------
                                    0 shares
<PAGE>
 
CUSIP No. 038181103                                                  Page 3 of 6


9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   BIATC            0 shares
                   BAI         15,000 shares
                               ------
                               15,000 shares


10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [_]

11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
                   BIATC          0.0%
                   BAI            0.1%
                                  ---
                                  0.1%

12.  TYPE OF REPORTING PERSON*
                   BIATC - BK
                   BAI - IA

                     *SEE INSTRUCTIONS BEFORE FILLING OUT

Item 1.  (a) NAME OF ISSUER:   Applied Digital Access, Inc.

         (b) Address of Issuer's Principal Executive Offices:

               9855 Scranton Road, San Diego, CA 92121

Item 2.  (a) NAME OF PERSON FILING:

               Brown Investment Advisory & Trust Company ("BIATC"), its wholly
               owned subsidiary, Brown Advisory Incorporated ("BAI").

         (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE:

               19 South Street
               Baltimore, Maryland 21202

         (c) CITIZENSHIP:

               Brown Investment Advisory & Trust Company and Brown Advisory
               Incorporated are Maryland corporations.
<PAGE>
 
CUSIP No. 038181103                                                  Page 4 of 6


         (d) TITLE OF CLASS OF SECURITIES:

               Common Stock of ($0.001 par) of Applied Digital Access, Inc.

         (e) CUSIP Number:

               038181103

Item 3.  If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
         check whether the person filing is a:

         For BIATC

         (b) [x] Bank as defined in section 3(a)(6) of the Act

         For BAI

         (e) [x] Investment Adviser registered under section 203 of the
             Investment Advisers Act of 1940

Item 4.  OWNERSHIP:

         (a) AMOUNT BENEFICIALLY OWNED:    As of April, 30, 1999

                   BIATC            0 shares
                   BAI         15,000 shares
                               ------
                               15,000 shares

         (b) PERCENT OF CLASS:

                   BIATC       0.0%
                   BAI         0.1%
                               ---
                               0.1%

         (c) Number of shares as to which such person has:

              (i)   sole power to vote or to direct the vote:

                      BIATC            0 shares
                      BAI         15,000 shares
                                  ------
                                  15,000 shares
<PAGE>
 
CUSIP No. 038181103                                                  Page 5 of 6


              (ii)  shared power to vote or to direct the vote:

                      BIATC           0 shares
                      BAI             0 shares
                                 ------      
                                      0 shares

              (iii) sole power to dispose or to direct the disposition of:

                      BIATC           0 shares
                      BAI        15,000 shares
                                 ------
                                 15,000 shares

              (iv)  shared power to dispose or to direct the disposition of:

                      BIATC           0 shares
                      BAI             0 shares
                                 ------ 
                                      0 shares

Item 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

         Not applicable

Item 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

         Not applicable

Item 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

         Not applicable

Item 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

         Not applicable

Item 9.  NOTICE OF DISSOLUTION OF GROUP.

         Not applicable
<PAGE>
 
CUSIP No. 038181103                                                  Page 6 of 6


Item 10. CERTIFICATION.

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were acquired in the ordinary
         course of business and were not acquired for the purpose of and do not
         have the effect of changing or influencing the control of the issuer of
         such securities and were not acquired in connection with or as a
         participant in any transaction having such purpose or effect.


         SIGNATURE:

              After reasonable inquiry and to the best of my knowledge and
         belief, I certify that the information set forth in this statement is
         true, complete and correct.

         Date:       As of April 30, 1999

         Signature:  Brown Investment Advisory & Trust Company
 
                     By: /s/ GREGG W. HAWES
 
                     Title:  Principal

         Signature:  Brown Advisory Incorporated

                     By: /s/ GREGG W. HAWES
 
                     Title:  Principal


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