Switching system reliability

Details Switching system reliability Switching system reliability

1990-05-31

1992-05-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 16, 370 581, 379221, 379273, 379279, 340827, H04Q 1100, H04M 714

Patent

active

051154250

ABSTRACT:
A distributed switching system where calls are processed in one of two call processing modes: 1) in a first call processing mode, available paths through a time-multiplexed switch (TMS) are selected without reference to whether the paths are presently established through the TMS, and 2) in a second call processing mode, the available path selections are made from only established paths through the TMS. Reliability is improved without an addition of hardware to the system because a transition may be advantageously effected to the second call processing mode in response to any system failure where it becomes impossible to select new TMS paths or to control their establishment, but where the established TMS paths at the time of the failure are still usable for new calls. Once such transition is completed, the system can continue to operate to complete calls between switching modules (SMs) in a reduced performance mode dependent on the number of TMS paths established between the SMs at the time of the failure.

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