Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1988-04-19
1990-09-18
Ng, Jin F.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379107, 379385, H04M 1100
Patent
active
049583719
ABSTRACT:
Apparatus in an automatic telecommunications system which communicates between a central location and at least one remote location over the switched telephone network, senses changes in loading of the telephone line which correspond to a telephone going off-hook, to serve as an indication that a telephone has gone off-hook and to cause the automatic telecommunications system to relinquish its use of the telephone line, or not to go off-hook if a telephone is in use.
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Damoci Joseph A.
Fourdraine John D.
Kern Matthew F.
Welsh Russell J.
Chan Wing F.
Control Data Corporation
Ng Jin F.
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