Patent
1977-06-10
1979-03-06
Brown, Thomas W.
179 15BY, H04J 312, H04Q 1104
Patent
active
041432410
ABSTRACT:
The present invention relates to a small digital time-division switching arrangement capable of interfacing with a plurality of PCM communication lines on one side and a separate plurality of transmission channels on the other side. A first processor primarily tracks call progress by scanning signalling bits indicating on/off hook state changes and a second processor controls the action of a time slot interchanger which both assembles and disassembles channel data and telemetry messages and establishes and breaks down calls while connecting appropriate service circuits to the communication lines during the progress of a call. The processors are implemented with separate microprocessor chips and associated memory and the switching arrangement can simultaneously communicate with a variety of call originating circuits employing a wide variety of control signals.
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Aranguren William L.
Langseth Rollin E.
Bell Telephone Laboratories Incorporated
Brown Thomas W.
Pfeifle Erwin W.
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