Multiplex communications – Wide area network – Packet switching
Patent
1984-09-07
1989-01-17
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 76, H04J 102
Patent
active
047992131
ABSTRACT:
Voice and data signals can be transmitted simultaneously yet independently over a subscriber telephone line. The speech and data use the same cable pair as far as the local exchange but thereafter they may be routed to the same destination or to different destinations, as desired. Each terminal unit (A or B) has a low pass filter (2) to isolate the voice and data. A data switch (5) switches an oscillator (6) by FSK. Switch (7) locks onto the Data Ready Interface (8). Bandpass filter (9) feeds the signal to the telephone line. A loop back switch LBS provides for testing from the exchange.
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Esteban-Hybrid Transmission-IBM Tech. Discl. Bulletin-vol. 19, #7-Dec. 1976-pp. 2571, 2572.
Clarke Dennis P.
Olms Douglas W.
Standard Telephones & Cables
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