H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04L 12/40 (2006.01)
Patent
CA 1232346
ABSTRACT OF THE DISCLOSURE An improved architecture for a computerized branch exchange particularly for a time division multi- plexed bus used in the exchange. An intershelf bus in- cludes a unidirectional source bus which receives sig- nals from expanders and a unidirectional destination bus which transmits signals to the expanders. The expanders, through another bus, communicate with line cards which interface with telephone station sets, commercial lines, etc. A time division multiplexed controller updates distributed connection tables contained in each of the expanders and controls the flow of data onto and from the unidirectional buses. The distributed connection tables eliminate the need to broadcast addresses during each time slot. The arrangement is particularly useful in reducing blocking associated with prior art bidi- rectional buses.
478137
Corbalis Charles M.
Duncan Michael G.
Edwards John D.
Graham Martin H.
Johnson Howard W.
Barrett B.p.
International Business Machines Corporation
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