H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/80
H04L 5/14 (2006.01) H04L 25/49 (2006.01) H04M 11/06 (2006.01) H04L 7/033 (2006.01)
Patent
CA 1171153
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 communi- cating with and controlling the other elements thereof. Communication is based on a bipolar code, and bipolar vio- lation 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 oepration 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.
416652
Johnson & Hicks
Queen's University At Kingston
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