Data path protection

Details Data path protection Data path protection

H - Electricity

04

J

363/10, 340/95

H04J 3/02 (2006.01) H04B 1/74 (2006.01)

Patent

CA 1321430

ABSTRACT DATA PATH PROTECTION The invention concerns a transmission system in which a plurality of data streams are to be multiplexed and sent between receiving and transmitting equipment. At the transmit end the system comprises a plurality of worker tributary cards (51, 52) each having an input port (57) connected to an individual tributary to be sent to an associated multiplexer, and a stand-by tributary card (56) operative to replace a failed worker card. All the worker tributary cards (51 - 55) are interconnected by a common line (60) leading to the input port (57) of the stand-by tributary card (56) but in normal operation being isolated from said line by a controllable unity-gain buffer 58. Each tributary to be transmitted is connected to an input port (57) of a worker tributary card and has a branch line which is connected to said common line (60) via the buffer (58) carried on another tributary card, detection of failure of a worker tributary causing the buffer (58) of the associated worker tributary card to be enabled to connect the tributary to said stand-by tributary card.

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