Network protection system for TAT-12/13 subsea cable network

Large capacity together with high reliability has been a major concern for international communication networks. In response to this requirement the transmission capacity of a 5 Gbit/s system corresponding to over 60,000 telephone circuits, has been adopted in the TAT-12/13 subsea cable network. As to the attainment of higher reliability of the communication network, a newly developed protection system has also been adopted. The TAT-12/13 cable network consists of four point to point links linked together by the network protection equipment (NPE) to form a ring. The network protection system (NPS) is composed of four NPE double rings and network management equipment (NME) which performs supervisory control of the entire network in four terminal stations. The NPE consists of two four fiber ring nodes. When a failure is detected in the network, a changeover of the communication signal from the failed route to a non-failed route is executed