H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/29
H04Q 3/54 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1169143
ABSTRACT A community office switching system includes a three- level hierarchy of distributed processors operating in parallel with one another. At the highest level, a stored-program call control processor controls call progression, establishing paths through the matrix switch network. At the second level, a ser- ies of special-purpose, stored-program, port control processors each service 1,024 ports, sensing and transmitting supervisory signals and communicating the occurrence of significant port events to the call control processor. Each port control pro- cessor dedicates approximately 32 microseconds out of every 32 milliseconds to each of the 1,024 ports in time-multiplex fash- ion, and hence no port can ever be locked out at the port-con- trol-processor level. One from a series of stored programs is executed to service each port precisely once every 32 millisec- onds. At the lowest level, a digital filtering processor, as- sociated with each port control processor, samples some signals from each port once every millisecond, filters the sampled sig- nals to give one filtered sample every four milliseconds, and stores the filtered samples for presentation to the associated port control processor once every 32 milliseconds.
392344
Bradshaw Robert H.
Edinger Dennis L.
Hinshaw David L.
Lenk Pedro A.
Mckinney Thomas H.
Smart & Biggar
Stromberg-Carlson Corporation
LandOfFree
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