Multiplex communications – Wide area network – Packet switching
Patent
1980-01-10
1982-01-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 82, 370 84, 370 91, 370101, 370112, H04J 316, H04J 306
Patent
active
043109225
ABSTRACT:
A bit-sampling multiplexer apparatus includes two terminals, each having a transmitter portion and a receiver portion. A transmitter in one terminal multiplexes data on a plurality of incoming data channels into a serial data frame, and couples this frame across a high-speed digital data communication line to the opposite terminal. The communication line comprises a physical twisted pair cable, optical fiber, or other suitable means for transporting digital data. Two separate lines are provided to enable communication in both directions between said terminals. The transmitter portion of each terminal periodically samples each of a plurality of data channels connected thereto at a rate significantly faster than the bit rate of each such channel, to generate the serial data frame. Each transmitter may also include an edge detector for generating a signal when a state change is detected in one or more high priority data channels. The transmitter acts in response thereto to truncate the data frame length so that said high priority data channel or channels is sampled again and a new data frame generated more quickly than would otherwise be the case.
REFERENCES:
patent: 3566365 (1971-02-01), Rawson et al.
patent: 3959595 (1976-05-01), Smith
patent: 4052567 (1977-10-01), MacKay
patent: 4097695 (1978-06-01), Grace et al.
IBM Technical Disclosure Bulletin, vol. 18, No. 10, Mar. 1976, pp. 3313-3314.
Johnston John R.
Lichtenberger W. Wayne
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