EXHIBIT 4.8
                                    AMENDMENT
                                     TO THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                               NETRIX CORPORATION
                                   ----------
                                   PURSUANT TO
                 SECTION 242 OF THE DELAWARE GENERAL CORPORATION LAW
                                   ----------


      The undersigned,  Steven T. Francesco,  being Chairman and Chief Executive
Officer of Netrix Corporation (the "Corporation"), hereby certifies that:

      1. The name of the Corporation is Netrix Corporation.

      2. The Certificate of  Incorporation of the Corporation was filed with the
Secretary of State of the State of Delaware on March 9, 1987.

      3. The text of the first sentence of Article  Fourth of the  Corporation's
Certificate  of  Incorporation  shall be and  hereby is  amended  to read in its
entirety as follows:

          "FOURTH:  I. The total  number of shares of all  classes of stock that
     the  Corporation  shall  have  authority  to  issue is  44,249,599  shares,
     consisting of: (i) 29,000,000  shares of common stock,  $0.05 par value per
     share (the "Common Stock") and (ii) 15,249,599  shares of preferred  stock,
     $0.05 par  value  per  share  (the  "Preferred  Stock")  consisting  of (A)
     2,499,946 shares that are designated as Class A Convertible Preferred Stock
     ("Class A Preferred  Stock");  (B) 3,639,333  shares that are designated as
     Class B  Convertible  Preferred  Stock  ("Class B  Preferred  Stock");  (C)
     4,686,026 shares that are designated as Class C Convertible Preferred Stock
     ("Class C Preferred  Stock");  (D) 3,424,294  shares that are designated as
     Class D Convertible  Preferred Stock ("Class D Preferred  Stock");  and (E)
     1,000,000 shares that initially are undesignated."

      4. This Amendment to the Certificate of  Incorporation  of the Corporation
was duly  authorized by the unanimous  written consent of the Board of Directors
of the Corporation  and the consent of a majority of the  outstanding  shares of
the  Corporation  entitled to vote on the proposal to adopt this  Amendment at a



duly  noticed and  conducted  regular  meeting of  stockholders  in a reconvened
session on August 26, 1999 following the meeting's July 27, 1999 adjournment.

      IN WITNESS  WHEREOF,  the  undersigned has subscribed this document on the
26th day of August,  1999, and does hereby affirm, under the penalty of perjury,
that the statements contained herein are true and correct.


                                                 /S/ STEVEN T. FRANCESCO
                                            ------------------------------------
                                                  Steven T. Francesco
                                            Chairman and Chief Executive Officer