Line switching control system in synchronous communication netwo

Details Line switching control system in synchronous communication netwo Line switching control system in synchronous communication netwo

1995-03-17

1998-05-26

Ton, Dang

Multiplex communications

Fault recovery

Bypass an inoperative channel

340827, H04J 116

Patent

active

057577692

ABSTRACT:
A line switching control system provided in each of stations connected by a first type line and a second type line in a synchronous communication network system in which frame data including an overhead is transmitted through the first type line or the second type line between the stations. The line switching control system includes a protection switching unit for switching the first type line used as a work line to the second type line defined as a protection line in a predetermined switching mode when a failure occurs in the first type line, and a unit, when the failure first type line is recovered, for transmitting line recovery mode information representing whether a line recovery mode is a REV mode in which the recovered first type line is reverted as the work line or a NON-REV mode in which the second type line is continuously used as a new work line and the recovered first type line is defined as a new protection line, the line recovery mode information being included in the overhead of the frame data.

REFERENCES:
patent: 4680776 (1987-07-01), Ikeuchi et al.
patent: 4733320 (1988-03-01), Ikeuchi et al.
patent: 5307353 (1994-04-01), Yamashita et al.
patent: 5495472 (1996-02-01), Ohara
patent: 5504856 (1996-04-01), Sasaoka
patent: 5587996 (1996-12-01), Mizuno
ITU-T Recommendation G. 707, "Synchronous Digital Hierarchy Bit Rates", Mar. 1993, pp. 1-173.
American National Standard for Telecommunications Digital Hierarchy Optical Interface Rates and Formats Specification, 1991, pp. 1-90.

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