Transmission system for switching connection from a working chan

Details Transmission system for switching connection from a working chan Transmission system for switching connection from a working chan

1998-04-06

2000-12-19

Patel, Ajit

Multiplex communications

Fault recovery

Bypass an inoperative channel

G06F 1120

Patent

active

06163526&

ABSTRACT:
A transmission system for transmitting data of a synchronous digital hierarchy SDH frame includes a transmission terminal, a transport terminal and a reception terminal linked together by a working channel line and a protection channel line in a redundant structure. Each of the transmission terminal and the transport terminal includes an alarm indication insertion unit which inserts an alarm indication in the SDH frame, the alarm indication indicating whether a related channel line has failed. The SDH frame containing the alarm indication is transmitted to the reception terminal prior to transmission of the data on the related channel line. The reception terminal includes a control unit which outputs a selected one of the SDH frame on the working channel line and the SDH frame on the protection channel line in response to the alarm indication received by the control unit. When one of the working channel line and the protection channel line has failed, the control unit switches a connection from one of the working channel line and the protection channel line to the other without causing instantaneous cutoff.

REFERENCES:
patent: 5537393 (1996-07-01), Shioda et al.
patent: 5631896 (1997-05-01), Kawase et al.
patent: 5923653 (1999-07-01), Denton
patent: 5978354 (1999-11-01), Taketomi et al.
patent: 6049523 (2000-04-01), Anderson et al.

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