Protection channel monitoring system using a check signal...

Details Protection channel monitoring system using a check signal... Protection channel monitoring system using a check signal...

H - Electricity

04

L

340/73

H04L 1/22 (2006.01)

Patent

CA 1274292

Abstract of the Disclosure: A protection channel monitoring system for monitoring a protection channel in a digital communication network comprises a transmitter (31) transmitting a check signal converted and split into a plurality of AMI code signals through the protection channel. The check signal is formed from a pseudo random signal provided by a pseudo random signal generator (15) driven by a pulse signal having a l/M (N being an integer larger than 1) frequency of a clock pulse signal. The check signal comprises two predetermined N-bit code patterns each comprising logical "0" and "1" level bits. A receiver (32) receives the split AMI code signals through the protection channel and decode the AMI code signals to the NRZ code signals by sampling technique using a sampling signal being derived from one of the received AMI code signals and having the l/N frequency of the clock pulse signal. Condition of the protection channel is decided by comparison of the decoded NRZ code signals.

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