Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Patent
1992-09-29
1994-06-14
Dwyer, James L.
Telephonic communications
Centralized switching system
Switching controlled in response to called station...
379279, 379268, H04M 322, H04M 300
Patent
active
053217446
ABSTRACT:
A user-programmable telephone switch which resides within a commercially available personal computer. The switch is controllable by either the personal computer's microprocessor or a separate, external host connected to an interface provided within the switch. The switch includes a CPU/matrix card that contains a time slot interchange and a CPU running under a real time operating system. The CPU/matrix card controls the overall operation of the switch in accordance with messages received from the operative host. In general, those tasks or functions which must be performed in real time are the responsibility of the switch, as opposed to the internal or external host. Within the switch, certain tasks or functions may be delegated by the CPU/matrix card to intelligent line cards which contain their own microprocessors having substantial call processing capability.
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"Travels," Andy, Marc and Harry; Teleconnect vol. 5 Issue 11 pp. 39-40.
IEEE International Conference On Communications-ICC 1990-Paper 211.3 vol. 1, 15 Apr. 1990, Atlanta, (US) pp. 128-133 XP147390.
Brochure for Model PCX-384 PC Digital Switching Exchange, manufactured and sold by Excel, Inc., Sagamore Beach, Mass.
User's Manual for Model PCX-384 PC Digital Switching Exchange.
Buttell Robert J.
Hebert Mark P.
Madonna Robert P.
Dwyer James L.
Excel, Inc.
Hunter Daniel S.
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