Data transmission system
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United States of America Patent
Stats
-
Jan 17, 1989
Grant Date -
N/A
app pub date -
Sep 7, 1984
filing date -
Sep 10, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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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