EXHIBIT L JOINT FILING AGREEMENT

                                                              EXHIBIT L
                             JOINT FILING AGREEMENT

                  In accordance with Rule 13d-1(f) promulgated under the
Securities and Exchange Act of 1934, the undersigned agree to the joint filing
of a Statement on Schedule 13D with respect to the shares of the Common Stock,
par value $.20 per share, of Amati Communications Corporation, and further agree
that this Joint Filing Agreement be included as an Exhibit thereto.


October 25, 1996                      QUANTUM INDUSTRIAL PARTNERS LDC

                                      By: /s/ Xxxx X. Xxxxxx
                                      Name:   Xxxx X. Xxxxxx
                                      Title:  Attorney-in-Fact



October 25, 1996                      S-C PHOENIX HOLDINGS, L.L.C.

                                      By: /s/ Xxxx X. Xxxxxx
                                      Name:   Xxxx X. Xxxxxx
                                      Title:  Manager



October 25, 1996                      QIH MANAGEMENT INVESTOR, L.P.


                                      By:  QIH Management, Inc.


                                      By: /s/ Xxxx X. Xxxxxx
                                      Name:   Xxxx X. Xxxxxx
                                      Title:  Vice President



October 25, 1996                      QIH MANAGEMENT, INC.

                                      By: /s/ Xxxx X. Xxxxxx
                                      Name:   Xxxx X. Xxxxxx
                                      Title:  Vice President









October 25, 1996                      WINSTON PARTNERS, L.P.

                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Attorney-in-Fact


October 25, 1996                      WINSTON PARTNERS II LDC


                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Attorney in Fact



October 25, 1996                      WINSTON PARTNERS II L.L.C.


                                      By:  Chatterjee Advisors L.L.C.,
                                           its manager


                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Manager



October 25, 1996                      CHATTERJEE MANAGEMENT COMPANY

                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Vice President



October 25, 1996                      CHATTERJEE ADVISORS L.L.C.

                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Manager







October 25, 1996                      CHATTERJEE FUND MANAGEMENT, L.P.

                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Attorney-in-Fact



October 25, 1996                      XX. XXXXXXXX XXXXXXXXXX


                                      By: /s/ Xxxxx X. Xxxxxxx
                                      Name:   Xxxxx X. Xxxxxxx
                                      Title:  Attorney-in-Fact



October 25, 1996                      MR. XXXXXX XXXXX


                                      By: /s/ Xxxx X. Xxxxxx
                                      Name:   Xxxx X. Xxxxxx
                                      Title:  Attorney-in-Fact