Protection switching system for carrier transmission line

Details Protection switching system for carrier transmission line Protection switching system for carrier transmission line

1984-11-09

1987-07-14

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

370 16, 34082501, 371 8, H04L 702

Patent

active

046807764

ABSTRACT:
A line protection switching system of improved reliability decreases the time for protection line switching. In order to increase reliability, service signals are sent in parallel via a plurality of transmission lines, using a service bit area of PCM bit frames. The system switches a failed transmission line to a stand by line, at a local station where trouble is detected without waiting for the switching of an opposite station. At the same time, a switching command is sent to the opposite station. If the switching of the opposite station fails, the local station commands a retry of the switching operation. If it again fails, the local station returns the transmission line to the initial state. In addition, a low priority signal is transmitted through the stand by line, so that the total system operates more economically.

REFERENCES:
patent: 3111624 (1963-11-01), Farkas
patent: 3681694 (1972-08-01), Sarati
patent: 3963988 (1976-06-01), Niethammer
patent: 3983340 (1976-09-01), Lima
patent: 4071700 (1978-01-01), Huffman et al.
patent: 4365247 (1982-12-01), Bargeton et al.
patent: 4442518 (1984-04-01), Morimoto
T. Ogawa et al., "405 Mb/s Single-Mode Optical Fiber Transmission System," pp. 779-782, Links For The Future, Science, Systems & Services for Communications, IEEE International Conference on Communications, May 14-17, 1984, RAI Congress Centre, Amsterdam, Dewilde et al., Ed.
European Search Report, Vienna, 12-11-85.
"DC-400M Protection Switching Equipment Using Microprocessor", pp. 1-15, Fujitsu Scientific and Technical Journal, Dec. 1980.

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