Signalling arrangement for telephone equipment

Details Signalling arrangement for telephone equipment Signalling arrangement for telephone equipment

1980-01-14

1982-08-24

Hecker, Stuart N.

H04M 1100

Patent

active

043462634

ABSTRACT:
Each of a number of remote subscriber telephones is connected through its own pair of lines, including ground lines, to a central office in the usual way. Each of many or all of the subscriber telephones has near it a special subscriber end equipment for doing a local job and connected across the related subscriber telephone. In the central office where the ground lines merge into a ground line going to one side of the standard direct current battery, supplying the remote subscriber telephones, there is a modulator in series in the ground line and effective to vary the voltage across the regular line pairs at a frequency or frequencies other than the voice frequency range but effective to actuate all of the special subscriber end equipments.

REFERENCES:
patent: 2922142 (1960-01-01), Lappin
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patent: 3492439 (1970-01-01), Billingsley et al.
patent: 3878322 (1975-04-01), Sullivan
patent: 3937889 (1976-02-01), Bell et al.
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patent: 4081608 (1978-03-01), Hodnett
patent: 4142156 (1979-02-01), Freund
patent: 4174064 (1979-11-01), Pratt, Jr.
patent: 4203008 (1980-05-01), Cohn-Sfetcu et al.
patent: 4211895 (1980-07-01), Davis et al.
patent: 4227248 (1980-10-01), Munter

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