AGREEMENT REQUIRED BY RULE 13d-1(f) Each of the undersigned agrees that this Schedule 13D is being filed on behalf of each of them.

                                               Exhibit I   


                         AGREEMENT REQUIRED BY
                             RULE 13d-1(f)


     Each of the undersigned agrees that this Schedule 13D is being
filed on behalf of each of them.


                          SCANA CORPORATION


                          By: s/Xxxxxxx X. Xxxxxxxxx            
                              Its: President                    
                          Date: March 26, 1996



                          MPX SYSTEMS, INC.



                          By: s/Xxxxxxx X. Xxxxxxxxx              
                              Its: President                    
                          Date: March 26, 1996