ISDN channel unit-resident mechanism for usurping time slots assigned to adjacent channel bank card slot
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United States of America Patent
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May 28, 2002
Grant Date -
N/A
app pub date -
Aug 7, 1998
filing date -
Aug 7, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
To obviate the need to install a null card in a non-ISDN configured channel bank, an ISDN channel unit is modified to include an interface circuit that uses NMQ signals clocked by the bank controller on a shared NMQ lead to artificially generate a `pseudo NMP` signal. This pseudo NMP signal and the NMQ signals enable the ISDN channel unit to conduct serial message exchanges with the bank controller during polling of an adjacent empty backplane card slot. The bank controller unit is thereby effectively `spoofed` into thinking that a channel unit is installed in the empty backplane slot. It releases a pair of time slots associated with the adjacent empty card slot, so that the spoofing ISDN channel unit can use the usurped time slots for 2B+D ISDN communications.
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