Carrier-Current Communication on Submarine Cables

Seven telephone channels and one telegraph channel on one single-conductor deep-sea cable have been made possible by t h e employment of carrier current on one of the two submarine cables across Catalina channel. This is the only application of carrier telephony to deep-sea cables and the system is one of the shortest carrier systems (26 mi.) in commercial operation; it provides more separate carrier channels (six) t h a n has been previously a t t e m p t e d ; and it differs in other important respects from other systems. This paper describes this carrier-current system.