Telecommunications switch with improved redundancy
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United States of America Patent
Stats
-
Jan 21, 1997
Issued Date -
N/A
app pub date -
Oct 10, 1995
filing date -
Mar 8, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
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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