Multiplex communications – Wide area network – Packet switching
Patent
1988-08-02
1991-02-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 581, H04J 300
Patent
active
049911694
ABSTRACT:
A dual digital signal processor (DSP) provides real time links between multiple time division channels of a digital carrier system (e.g. T-1) and a host data processor. Operating only on digital signals, internally and at its interfaces to the carrier and host systems, the DSP exchanges data and control signalling information with the carrier system and data and control information with the most processor, converting the data in passage to different digital forms. At the interface to the carrier system, signals are received and transmitted in a form adapted to diverse terminal equipment of users remotely linked to the carrier system via the switched public network. At the host interface, signals are transferred and received in a form suited to the data process requirements of the host system (e.g. data bytes directly representing alphanumeric characters). Thus, the DSP acts as the equivalent of multiple different types of modems in performing required conversions. The DSP may also perform processing services in order to reduce the processing burden on the host system (e.g. parity checking of data, detection of specific character functions in data or specific tones in audio signals, selective routing of voice to host storage for voice mail applications, etc.).
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Davis Gordon T.
Ho Lung Michael G.
Mandalia Baiju D.
Millas Roland J.
Ortega Oscar E.
Edwards Christopher O.
International Business Machines - Corporation
Lieber Robert
Olms Douglas W.
Smith John C.
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