Protection switching system for carrier transmission line

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

H - Electricity

04

L

340/73

H04L 1/00 (2006.01) H04B 1/74 (2006.01)

Patent

CA 1247206

25307-126 ABSTRACT This invention provides a line protection switching system of improved reliability and decreased switching time. In order to increase the reliability, the service signals are sent in parallel via several transmission lines, using a service bit area of PCM bit frames. Unlike prior art systems the present system switches a failed transmission line to a stand by lines at a station where a fault is detected before waiting for the switching of the opposite station to be completed. At the same time, the switching command is sent to the opposite station. If the switching of the opposite station fails, the station commands retry of the switching but if it fails again, the station switches the transmission line to the initial state. Since a low priority signal is transmitted through the stand by line, the total system can be economized.

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