Multiplex communications – Wide area network – Packet switching
Patent
1985-08-02
1989-06-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082501, H04J 116
Patent
active
048377600
ABSTRACT:
An optical fiber communications system with a plurality of bidirectional channels and a protection channel is disclosed. Each channel has a respective identity which is transmitted in the traffic of that channel and in the event of a protection switch is identified in the protection channel traffic. A protection switch is effected by detecting a channel failure at the receive end of a span, transmitting a protection request on the return channel back to the transmit end of the span, and using this request in a controller for the channel to effect a protection switch, using an individual selector for the channel, if a priority scheme allows. The controllers are enabled or disabled under software control following a protection switch in accordance with the prevailing priority scheme. The arrangement provides for rapid protection switching.
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patent: 4376999 (1983-03-01), Abbott et al.
patent: 4382294 (1983-05-01), Beuscher et al.
patent: 4412323 (1983-10-01), Abbott et al.
patent: 4455645 (1984-06-01), Mijioka et al.
patent: 4543651 (1985-09-01), Chang
patent: 4598399 (1986-07-01), Bath
patent: 4680776 (1987-07-01), Ikeuchi et al.
Betts Malcolm C.
Ellson John C.
Reid David I.
Haley R. John
Northern Telecom Limited
Olms Douglas W.
Scutch III Frank M.
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