Sughrue, Mion, Zinn, Macpeak & Seas
Monitoring method for stand-by circuits suitable for a multiplexing/demultiplexing apparatus
 In a multiplexing/demultiplexing apparatus, readiness of stand-by circuits is monitored through a variety of switching arrangements, by routing a monitoring signal through the circuits. In one alternative embodiment, level correcting means are provided so that the monitoring signal is kept at the proper level, thus ensuring accurate monitoring of the stand-by circuits. 
NEC Corporation
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H04L H04M H04J
inventional inventional inventional
Masaaki Naohiro Yasushi
Saito Shimada Ohno