Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1995-01-05
1996-12-10
Matar, Ahmad F.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379376, 379210, 379214, 370524, H04M 302
Patent
active
055839304
ABSTRACT:
In a communication system having a plurality of communication apparatuses that are connected to one line, each communication apparatus has a detection circuit for detecting a call signal from the line to another communication apparatus connected to the line. Each communication apparatus also has a circuit that informs the operator at the communication apparatus of such call signal or a device for altering such call signal to a call signal to the communication apparatus itself.
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Nakatsuma Takuji
Ogata Yukihiko
Canon Kabushiki Kaisha
Matar Ahmad F.
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