Protection channel monitoring system using a check signal compri

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

1987-04-28

1989-03-07

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 40, 375102, H04B 346

Patent

active

048113590

ABSTRACT:
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 1/N (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 1/N frequency of the clock pulse signal. Condition of the protection channel is decided by comparison of the decoded NRZ code signals.

REFERENCES:
patent: 4395772 (1983-07-01), Trested, Jr.
patent: 4417348 (1983-11-01), Abbruscato
patent: 4471491 (1984-09-01), Abe et al.
patent: 4577312 (1986-03-01), Nash
patent: 4598399 (1986-07-01), Bath
patent: 4656645 (1987-04-01), Kaneko
patent: 4680776 (1987-07-01), Ikeuchi et al.

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