Optically restorable WDM ring network using simple add/drop circ

Details Optically restorable WDM ring network using simple add/drop circ Optically restorable WDM ring network using simple add/drop circ

1996-12-27

1999-07-13

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359119, 340827, 371 206, 370223, H04J 1402

Patent

active

059234490

ABSTRACT:
A parallel ring network is restorable upon sensing a failure of a transmission media. A central transmitter is coupled to one end of a first transmission medium. A central receiver is coupled to one end of a second transmission medium. A central sensor senses a transmission media failure centrally and provides a central alarm. In response to the central alarm, the central receiver is coupled to another end of the first transmission medium and the central transmitter is coupled to another end of the second transmission medium. At least one local station has a local receiver, a local transmitter, a local sensor for sensing a transmission media failure locally and providing a local alarm, and a local switch. In response to the local alarm, the local switch moves from a first position to a second position. When the local switch is in the first position, the local transmitter is coupled to the second transmission medium and the local receiver is coupled to the first transmission medium. When the local switching means is in the second position, the local transmitter is coupled to the first transmission medium and the local receiver is coupled to the second transmission medium. A method for restoring the parallel ring network is described.

REFERENCES:
patent: 4973953 (1990-11-01), Shimokawa et al.
patent: 5069521 (1991-12-01), Hardwick

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