Path protection switching device

Details Path protection switching device Path protection switching device

1994-11-22

1996-11-05

Hsu, Alpus H.

Multiplex communications

Wide area network

Packet switching

370 55, 370112, H04J 308, H04J 314

Patent

active

055725139

ABSTRACT:
A path protection switching device is provided for a SONET type transmitter-receiver for transmitting and receiving synchronous byte multiplex signals, wherein the scale of circuitry such as a path switch, alarm detecting sections and the like can be reduced. A path switch selects one of channel signals input thereto at identical timing, from time-division multiplex signals output from first and second TSAs while the multiplex signals remain multiplexed. In order for one of the channel signals to be selected while the signals remain multiplexed, the channel signals must be in phase; therefore, phase adjusting sections are provided to cope with the situation where the channel signals are out of phase. Further, to enable the path protection switching device to operate on time- division multiplex signals in which channel signals of difference sizes are multiplexed, VT size detecting sections each detect the size of individual channel signals forming the multiplex signal, and supply the detected signal size to the path switch.

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