Telecommunications switch with improved redundancy

Details Telecommunications switch with improved redundancy Telecommunications switch with improved redundancy

1995-10-10

1997-01-21

Hsu, Alpus H.

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

370360, 340827, 34082583, 39518201, 39518319, H04Q 1100, G06F 1100

Patent

active

055965695

ABSTRACT:
A programmable telecommunications switch has automatic backup of line cards to provide complete redundancy. The switch has I/O cards which terminate the external telecommunications spans. Each I/O card passes the data from its spans to a line card. When the line card fails, the I/O card switches the data onto an I/O bus which is connected to a standby I/O card. The standby I/O card switches a standby line card into connection with the I/O bus such that the data stream is then serviced by the standby line card. The failed line card may then be removed and replaced. All I/O cards are attached to the I/O bus such that redundancy for all active line cards using the same signalling protocol is provided with a single standby line card. With multiple I/O busses, standby I/O cards and standby line cards, multiple redundancy is possible. Finally, the failure of a single line module of a line card may be handled by switching only the span serviced by that module to a standby line card. Spans from different I/O cards may be serviced by different line modules of a single standby line card, and may be all connected to the same standby line card by the same bus.

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Research Disclosure, No. 339, Jul. 1992, EMSWORTH (GB) p. 529, XP316629 `Circuit card with contacts of five different lengths for gradual current change when card is plugged in or unplugged`.
IBM Technical Disclosure Bulletin, vol. 35, No. 5, Oct. 1992, ARMONK (US) pp. 391-394, XP313021 `Method for card "HOT PLUG" detection and control`.

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