Multiplex communications – Wide area network – Packet switching
Patent
1987-02-06
1989-09-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 29, 370 32, 371 101, H04J 300
Patent
active
048645575
ABSTRACT:
A set of operating parameters that define the functions of a data unit interfacing a subscriber's terminal to a 2-wire telephone loop and which are stored in a volatile memory of a microcomputer in the data unit may be changed or periodically refreshed from the same parameter set stored in a volatile memory of a microcomputer in a data line card that functions as a datapath interface of a central data and voice communication facility. Bidirectional data transmission on the loop occurs via time compression multiplexing which requires synchronization between the interfaces. Loss of synchronization indicates the likelihood of a power interruption at the data unit and consequent erasure of memory. The presence of synchronization is tested and upon a positive indication the operating parameters are downloaded from the data line card to the data unit.
REFERENCES:
patent: 4449205 (1984-05-01), Hoffman
patent: 4458307 (1984-07-01), McAnlis et al.
patent: 4476558 (1984-10-01), Arnon
patent: 4603406 (1986-07-01), Miyazaki et al.
patent: 4649533 (1987-03-01), Chorley et al.
patent: 4700292 (1987-10-01), Campanini
patent: 4710926 (1987-12-01), Brown et al.
Lander Emil
Morton John D.
Newcombe Edmund A.
Jung Min
Northern Telecom Limited
Olms Douglas W.
Sakovich Michael M.
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