Communication apparatus having function of generating calling si

Details Communication apparatus having function of generating calling si Communication apparatus having function of generating calling si

1994-08-08

1997-07-15

Zele, Krista M.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379413, 37910016, H04M 100, H04M 1100

Patent

active

056490062

ABSTRACT:
A communication apparatus includes a DC power supplying unit for supplying a DC power to the apparatus, the DC power supplying unit containing a calling signal generating unit for generating a calling signal; a control unit for outputting a control signal to control said DC power supplying unit; and a conversion unit for electrically-isolating supplying the control signal outputted from said control unit to the calling signal generating unit.

REFERENCES:
patent: 3940572 (1976-02-01), Burgess
patent: 4421953 (1983-12-01), Zielinski
patent: 4734936 (1988-03-01), Tanaka et al.
patent: 4942600 (1990-07-01), Suzuki
Pat. Abs. Jp. vol. 9, No. 234, Sep. 20, 1985 (JP-A-60 89 159).

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