Multiplex transmission system and apparatuses for same

Details Multiplex transmission system and apparatuses for same Multiplex transmission system and apparatuses for same

1997-08-20

2000-05-09

Olms, Douglas W.

Multiplex communications

Fault recovery

Bypass an inoperative channel

34082501, H04L 122

Patent

active

060613297

ABSTRACT:
An SDH multiplex transmission system has a transmission terminal apparatus and a reception terminal apparatus that are connected to each other through channels of an N+1 redundant structure. The transmission terminal apparatus loads predetermined information that violates SDH standards into the overhead of an STM frame and transmits the same to a spare channel that is not currently used. The reception terminal apparatus monitors an STM frame received through the spare channel, and when the predetermined information in the overhead thereof satisfies a predetermined violation detection condition, determines that the spare channel is unused. The violation information is byte information such as H1, MS-REI, or STM-ID. As a result, the SDH multiplex transmission system has a simple structure to let the reception terminal apparatus correctly determine whether or not the spare channel is used.

REFERENCES:
patent: 5631896 (1997-05-01), Kawase et al.
patent: 5721727 (1998-02-01), Ashi et al.

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