Michael M Duncan

US Patent:

46270507, Dec 2, 1986

Filed:

May 22, 1984

Appl. No.:

6/613026

Inventors:

Howard W. Johnson - Santa Clara CA
Michael G. Duncan - Fremont CA
Rod G. Sinks - Mountain View CA
John D. Edwards - Campbell CA
Martin H. Graham - Berkeley CA
James M. Kasson - Menlo Park CA
Charles M. Corbalis - San Jose CA

Assignee:

Rolm Corporation - Santa Clara CA

International Classification:

H04J 302
H04J 316

US Classification:

370 85

Abstract:

An improved architecture for a computerized branch exchange particularly for a time division multiplexed bus used in the exchange. An intershelf bus includes a unidirectional source bus which receives signals 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 bidirectional buses.