Optical ring network

Details Optical ring network Optical ring network

1985-12-26

1987-11-03

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

370 16, 455601, 455607, 455612, H04B 900

Patent

active

047047135

ABSTRACT:
An optical fiber-ring network is disclosed. The network is capable of operating in the face of the failure of any single node regardless of the particular node failure mechanism, including stuck "on" and stuck "off" transmitters.
Each node in the network comprises a main receiver, an alternate receiver, and a transmitter. The main receiver receives data from the immediately adjacent upstream node, while the alternate receiver monitors transmissions from the next preceding upstream node. Each node diagnoses the transmitter in its immediately adjacent upstream neighbor and its own main receiver. If either fails, the node switches from its main receiver to its alternate receiver to bypass the immediately adjacent upstream node, while the rest of the ring remains functional.

REFERENCES:
patent: 4048446 (1977-09-01), Hafner et al.
"Fail Safe Nodes for Lightguide Digital Networks", The Bell System Technical Journal, vol. 61, No. 2, Feb. 1982, pp. 247-256.

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