Communications system with protection switching using...

Details Communications system with protection switching using... Communications system with protection switching using...

H - Electricity

04

B

325/1, 340/73, 3

H04B 9/00 (1985.01)

Patent

CA 1255770

COMMUNICATIONS SYSTEM WITH PROTECTION SWITCHING USING INDIVIDUAL SELECTORS Abstract of the Disclosure An optical fiber communications system with a plurality of bidirectional channels and a protection channel is disclosed. Each channel has a respective identity which is transmitted in the traffic of that channel and in the event of a protection switch is identified in the protection channel traffic. A protection switch is effected by detecting a channel failure at the receive end of a span, transmitting a protection request on the return channel back to the transmit end of the span, and using this request in a controller for the channel to effect a protection switch, using an individual selector for the channel, if a priority scheme allows. The controllers are enabled or disabled under software control following a protection switch in accordance with the prevailing priority scheme. The arrangement provides for rapid protection switching. - i -

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