Telephone apparatus and private branch exchange apparatus

Details Telephone apparatus and private branch exchange apparatus Telephone apparatus and private branch exchange apparatus

1995-06-09

1998-02-10

Chiang, Jack

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379 93, 379 95, 379377, 379387, 379413, H04M 1100

Patent

active

057177511

ABSTRACT:
In addition to the conventional telephone portion, this telephone apparatus, coupled to a subscriber's (TEL) line coupled to an intercommunication (ICM) line, comprises a modulation circuit for modulating a data signal to have a frq band different from that used in the conventional telephone portion; a demodulation circuit for receiving/demodulating a modulated data signal having that frq band from another telephone apparatus connected to the same ICM line; and a control circuit for effecting communication with the TEL line and generating control data indicative of inhibition of using the TEL line and transmitting it as the data signal toward another telephone apparatus when the user responds a call or demodulation circuit does not receive modulated data signal indicative of inhibition of using the TEL line from another telephone apparatus. A busy tone may be supplied to the user when the user tries to use the TEL line if the control data is received by the demodulation circuit. Thus, if plural this type telephone apparatus are connected to the same ICM line, interference is prevented and each is alive in power fail because each has an interface. Further, ICM is provided with modulation signal through ICM line. A pbx having band-stop filters for preventing leaking of the ICM but transmitting control data to another ICM line is disclosed.

REFERENCES:
patent: 5361296 (1994-11-01), Reyes et al.
patent: 5400397 (1995-03-01), Ryu
patent: 5581612 (1996-12-01), Nishikawa

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