Filtering of port data in a switching system employing interacti

Details Filtering of port data in a switching system employing interacti Filtering of port data in a switching system employing interacti

1982-04-29

1984-04-17

Brown, Thomas W.

H04Q 354

Patent

active

044436637

ABSTRACT:
A central office telephone switching system including two interactive processors, including a call control processor that controls calls by establishing sequences of call progression states, and a port event processor that controls the ports and transmits and receives supervisory information to and from the ports. The port event processor and call control processor communicate through a port data store. The port event processor transfers the received supervisory information to the port data store, for use by the call control processor. The port event processor includes a digital filter that periodically time-samples the received supervisory information and determines the proper state of the received supervisory signal based on the states of the majority of the received sample signals.

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patent: 4133980 (1979-01-01), Moed
"A Preprocessor for SPC Switching Systems", Winch and Hyde, International Switching Symposium (Munich), Sep. 1974, pp. 147/1-6.
"New Digital Electronic PABX Family", R. C. Garavalia, GTE Automatic Electric Journal, May 1977, pp. 303-311.
"The GTD-1000 Digital PABX", R. C. Wegner, GTE Automatic Electric Journal, Mar. 1977, pp. 262-268.

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