Multiplex communications – Wide area network – Packet switching
Patent
1990-02-27
1991-12-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 34082506, 34082536, 371 3, 371 151, H04L 1226, H04J 314, H04B 346, G06F 1130
Patent
active
050704974
ABSTRACT:
A transmission network nodes, including electronically controlled distributors so that, in the case of a failure of a path, a substitute path can be switched in very rapidly. Switching orders sent to the nodes from a controller include an unambiguous designation of the digital path to be switched, and the source network node passes this designation on to the subsequent network nodes, so that the subsequent nodes can check their switching. Alarm signals which are normally passed on transparently from node to node are converted to a substitute digital signal (EDS) with a standardized frame structure so that the alarm can be transmitted to the end of the path without issuing alarms at each node. The unambiguous path designation and the substitute digital signal (EDS) may both be transmitted without interfering with each others.
REFERENCES:
patent: 4365248 (1982-12-01), Bargeton et al.
patent: 4870638 (1989-09-01), Kawano et al.
patent: 4884263 (1989-11-01), Suzuki
patent: 4939725 (1990-07-01), Matsuda et al.
Alcatel N. V.
Hsu Alpus H.
Olms Douglas W.
Van Der Sluys Peter C.
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