Path switching device for transmission apparatus

Abstract

Two alarm detecting units required as alarm detecting units for controlling a PSW in order to implement a PSR function, are deleted, and instead the result of an alarm detection output by a conventional alarm detecting unit (E-THRU) for a BLSR function is cross-connected in units of STS-1 frames by an alarm TSA apparatus (E-DROP). In the same way, the result of an alarm detection output by an alarm detecting unit (W-THRU) is cross-connected in units of STS-1 frames by an alarm TSA apparatus(W-DROP). These two cross-connected alarms are compared by a comparing unit (DROP). Based on the result of the comparison the PSW is controlled.

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