Multiplex communications – Wide area network – Packet switching
Patent
1981-11-30
1985-04-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04M 1100
Patent
active
045091641
ABSTRACT:
A microprocessor based, digital to digital converting, full duplex time division multiplexing data set operating in burst mode transmission interfaces a data terminal to a communication path for communicating with another data terminal. The data set includes a transmitter, a receiver, a controlled transmit/receive switch, digital logic control circuitry, and a microprocessor for communicating with and controlling the other elements thereof. Communication is based on a bipolar code, and bipolar violation encoding is used to signal special messages. Control words, indicated by bipolar violations, are generated within one data set and transmitted to another data set as a preamble to a bipolar violation for communicating information to, and controlling operation of, the other data set. Special start and stop bits are generated by the data set before and after each fixed length data block for clock synchronization and DC balancing, and are stripped from the data clock by the receiving data set. Circuitry is also provided for generating a DC balance bit within each preamble to a bipolar violation. Specific logic circuits and control programs cooperate in providing system operation.
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Chin Wellington
Olms Douglas W.
Queen's University at Kingston
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