Line switching system

Details Line switching system Line switching system

1994-09-08

1996-07-02

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359119, 359166, 359177, H04B 1008

Patent

active

055328628

ABSTRACT:
An optical transmission system includes a plurality of nodes connected via optical transmission lines in a ring form. When an optical transmission line is disconnected or a fault is found on the optical transmission device of a node, a transmission line is switched over to another transmission line by a line switching system which includes optical transmission lines of a working line for transmitting optical data signals and a protection line for transmitting APS (Automatic Protection Switch) bytes. Each of the nodes has a comparing and detecting unit for receiving the APS bytes sent from an adjacent node and comparing a fault pattern indicated by the APS bytes with a fault pattern stored in advance, and a processing unit which determines a line switching route, based on the result of comparison in the comparing and detecting unit.

REFERENCES:
patent: 4313224 (1982-01-01), Wakabayashi
patent: 4887309 (1989-12-01), Andersson
patent: 5119222 (1992-06-01), Hara
patent: 5159595 (1992-10-01), Flanagan
patent: 5365510 (1994-11-01), Nicholson

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