Communications apparatus

Details Communications apparatus Communications apparatus

1994-04-14

1995-05-09

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379161, 379184, 379199, H04M 165

Patent

active

054147646

ABSTRACT:
A communication unit connectable in parallel with other communication equipment to a two-wire telephone line communicates through the telephone line and a detector detects a voltage across the two-wire telephone line. A command unit commands communication by the communication unit and a controller controls the communication by the communication unit according to the detection by the detector and the command by the command unit.

REFERENCES:
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patent: 4218590 (1980-08-01), Rasmussen et al.
patent: 4444999 (1984-04-01), Sparrevohn
patent: 4567329 (1986-01-01), Bailly et al.
patent: 4807278 (1989-02-01), Ross
patent: 4809317 (1989-02-01), Howe et al.
patent: 4825465 (1989-04-01), Ryan
patent: 4941166 (1990-07-01), Waldman et al.
patent: 4947423 (1990-08-01), Watanabe
patent: 5216705 (1993-06-01), Yoshida et al.
patent: 5255312 (1993-10-01), Koshiishi

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