Multiplex communications – Fault recovery – Bypass an inoperative channel
Patent
1997-06-26
2000-03-28
Hsu, Alpus H.
Multiplex communications
Fault recovery
Bypass an inoperative channel
370384, 370388, 340826, 379272, G06F 1100, H04L 1250, H04M 300
Patent
active
060440597
ABSTRACT:
Contention losses are minimized in path searching, circuit-switched networks by adding intelligence to the last stage of the network. A count of number of bytes remaining to be transferred in each active message is maintained in real time for each output port of the network. If contention arises at the last stage switch being requested in camp-on mode to make a connection to a busy output port, the switch checks the bytes remaining count and responds differently depending on how the bytes remaining count compares to a preset threshold register. If the count remaining is below the threshold, the last stage switch accepts the camp-on request, because the desired output port will be available shortly. If the count remaining is above the threshold or below the threshold but another user is camped-on, the switch rejects the camp-on request to the last stage, because the desired output port will not be available shortly. In this case further path searching would be meaningless. A different message to a different destination (output port) is tried, and later the contended message is retried.
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Beckstrand Shelley M
Hsu Alpus H.
International Business Machines - Corporation
Qureshi Afsar M.
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