Interface for connecting standard telephones to party lines

Details Interface for connecting standard telephones to party lines Interface for connecting standard telephones to party lines

1986-02-28

1987-02-24

Schreyer, Stafford D.

Telephonic communications

Polystation line system

Automatic or unattended

379184, 379179, H04M 170, H04M 316

Patent

active

046458778

ABSTRACT:
A party line interface for permitting the connection of a standard telephone to a telephone central office which rings selected subscribers by applying a DC ringing potential of a selected polarity to a selected one of the tip and ring lines of the party line and a ringing tone is disclosed. The interface includes a signal path having two lines with each line having an input terminal and an output terminal. The input terminals are respectively adapted to be connected to the ring and tip lines of the party line. A programmable switching means is coupled to the signal path for selectively applying the ringing signal received by the party line interface to the output terminals for application to the ringing mechanism within the standard telephone as a function of the polarity of the DC component and ground reference applied to the input terminals by the telephone company central office. The ringing signal is applied to the standard telephone by the interface only when a chosen one of the two possible DC polarities provided by the party line central office is applied to a chosen one of the pair of lines of the signal path.

REFERENCES:
patent: 3626106 (1971-12-01), Greening et al.
patent: 3689705 (1972-09-01), Pinede et al.
patent: 4048448 (1977-09-01), Canniff et al.
patent: 4221935 (1980-09-01), Barsellotti et al.
patent: 4224476 (1980-09-01), Tuhy, Jr.
patent: 4293737 (1981-10-01), Cepelinski
patent: 4406004 (1983-09-01), Hall et al.
patent: 4528424 (1985-07-01), Middleton et al.

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