Multiplex communications – Wide area network – Packet switching
Patent
1990-06-06
1993-05-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, H04J 302
Patent
active
052146456
ABSTRACT:
A multi-user Time Division Multiplex (TDM) system includes a plurality of stations connected by one or more unidirectional data buses. A "queue of request" (QR) counter is added to each station having destination slot release capability (erasure station). The QR count indicates how many idle time slots on a first channel have been released by an erasure station. The QR counter is incremented when that station becomes active (i.e., has a data transmit request) and when a request bit on a second channel has been erased by that erasure station. The QR counter is decremented when a used time slot on the first channel is released to an idle time slot condition as long an outstanding requests exist from downstream stations. When the QR count is negative (indicating more released time slots than erased requests) that station erases a request signal on the channel opposite the channel when the time slot was released. When the QR count is positive (indicating that there are fewer released time slots than the total number of received and erasure station request signals), that station writes an additional request signal to its respective upstream or downstream stations. When the QR count is zero, request signals are not altered by that station. A separate QR counter and associated circuitry is utilized by each unidirectional bus of the TDM system.
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AT&T Bell Laboratories
Caccuro John A.
Olms Douglas W.
Ton Dang
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