Optical one-to-one protection switching apparatus

Details Optical one-to-one protection switching apparatus Optical one-to-one protection switching apparatus

2005-12-13

2005-12-13

Chan, Jason (Department: 2633)

Optical communications

Fault recovery

Bypass inoperative element

C398S005000

Reexamination Certificate

active

06975811

ABSTRACT:
An optical one-to-one protection switching apparatus exchanges signals between a transmit node and a receive node. If a fault is detected in the first transmission line (down-stream), a controller in the node controls a drive circuit so as to shut off a gate. Then, the controller in the transmit node upon receiving a switching request from the receive node, controls the drive circuit so as to shut off the gate. Thereby, the optical switch is switched. The transmitter of the client terminal is thus connected to the second transmission line (down-stream). Upon receiving the switching request from the transmit node, the optical switch in the receive node is switched. Thereby the receiver in the client terminal is connected to the second transmission line (down-stream).

REFERENCES:
patent: 5903370 (1999-05-01), Johnson
patent: 5978354 (1999-11-01), Taketomi et al.
patent: 6414765 (2002-07-01), Li et al.
patent: 6434288 (2002-08-01), Uemura et al.
ITU-T G.841, “Types and Characteristics of SDH Network Protection Architectures”, Oct. 1998, pp. 11 and 17.
Rajiv Ramaswami and Kumar N. Sivarajan, “Optical Networks: A Practical Perspective”, Morgan Kaufman Publishers pp. 430-434.

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