SG undersea cable system: Requirements and performance

This paper reviews the major parameters of the SG Undersea Cable System. SG transmission goals and signal statistics were established, which led to a specific system and equalization design. As the SG design evolved, information on cable aging led to the introduction of four shore-controlled equalizers in the SG transatlantic link (TAT-6). Performance delivered by the TAT-6 link has been generally satisfactory, though some excess noise was encountered in the top third of the high band. Equalization results permit the link to handle 4200 two-way voice channels, 200 more than the objective.