Multiplex communications – Wide area network – Packet switching
Patent
1980-06-30
1982-04-20
Britton, Howard
Multiplex communications
Wide area network
Packet switching
375 36, H04L 514
Patent
active
043262872
ABSTRACT:
This invention details a baseband bipolar pulse signaling technique employing only two wires for simultaneous bi-directional communications. A first polarity of pulses is utilized for communication of traffic in one direction; traffic in the return direction utilizes pulses of the opposite polarity. Each end of the communication link has both a sender and a receiver. One sender arbitrarily transmits only positive pulses; the receiver at this end of the system will recognize only negative pulses. The inverse set of conditions is enforced at the opposite end of the link. Means are included for synchronizing the application of pulses to the link at the other end in response to the receipt of pulses at that end to avoid overlap of receive pulses at the originating end of the line.
REFERENCES:
patent: 3339022 (1967-08-01), Abramson
patent: 3721763 (1973-03-01), Homan
patent: 4012590 (1977-03-01), Haass
patent: 4084069 (1978-04-01), Looschen
patent: 4112253 (1978-09-01), Wilhelm
patent: 4117277 (1978-09-01), van den Elzen
patent: 4253181 (1981-02-01), Watten
The TSTA-1 Telephone Equipment for a Digital Communication Network by Abugov et al., Telecommunications and Radio Engineering, vol. 33--34, Nov. 1979, pp. 27-30.
Britton Howard
Duffield Edward H.
International Business Machines Corp.
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