EXHIBIT 99.6 AGREEMENT AS TO JOINT FILING OF SCHEDULE 13D Each of the undersigned hereby affirms that it is individually eligible to use Schedule 13D and agrees that this Schedule 13D is filed on its behalf. Dated: November 2, 1998

                                                                    EXHIBIT 99.6

                     AGREEMENT AS TO JOINT FILING OF SCHEDULE 13D

Each of the undersigned hereby affirms that it is individually eligible to use
Schedule 13D and agrees that this Schedule 13D is filed on its behalf.

Dated:    November 2, 1998

                                   SUT ACQUISITION CORP.


                                   By: /s/Xxxxxx X. Xxxxxx
                                       ------------------------------
                                       Name:  Xxxxxx X. Xxxxxx
                                       Title: Chairman of the Board, President
                                              and Chief Executive Officer

                                   SUPERIOR TELECOM INC.


                                   By: /s/Xxxxxx X. Xxxxxx
                                       ------------------------------
                                       Name:  Xxxxxx X. Xxxxxx
                                       Title: Chairman of the Board, President
                                              and Chief Executive Officer

                                   THE ALPINE GROUP, INC.


                                   By: /s/Xxxxxx X. Xxxxxx
                                       ------------------------------
                                       Name:  Xxxxxx X. Xxxxxx
                                       Title: Chairman of the Board
                                              and Chief Executive Officer