H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/26, 344/1.4
H04Q 3/58 (2006.01) H04B 1/74 (2006.01)
Patent
CA 1067986
LINE PROTECTION SWITCHING SYSTEM Abstract of the Disclosure Protection for service lines linking offices in a communications sytem is realized by linking the offices in a sequence with a serial connection of pro- tection lines. Protection for service lines which by- pass one or more of the offices in the serial sequence is achieved by automatically controllably cascading appropriate ones of the protection lines. The cascading of protection lines is realized on a nonhierarchical basis by assigning each service line in the system a unique address and by supplying a protection switch request message including the address of the requesting service line sequentially to each office in the serial sequence until the transmit-end of the requesting line is located. A switch-is automatically effected by equipment located at the offices only if all the pro- tection lines to be cascaded are available. The availability of the protection lines is indicated at each office and an indication thereof is included in the protection switch request message being propagated sequentially to the offices in the system.
253364
Fang Geng-Seng
Mitchell William J. (jr.)
LandOfFree
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