Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Patent
1997-02-11
1999-12-21
Patel, Ajit
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
370221, 370524, 39518209, H04J 116
Patent
active
060058412
ABSTRACT:
A redundancy arrangement for use in connection with a programmable telecommunications switch or other device. An active hardware device, such as an ISDN packet engine card, is paired with a substantially identically configured standby device. During operation, the active device, in addition to performing all of its normal functions, also advises the standby device of all events which have an effect on the operational state of the active device. By ensuring that the standby device processes the same events in the same sequence as the active device, the standby device's operational state continuously tracks that of the active device. Should the active device malfunction or be taken out of service, the standby device becomes active without significant interruption or loss of service.
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* with English abstract from European Patent Office.
Excel Switching Corporation
Patel Ajit
Phunkulh Bob A.
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