Party line converter

Details Party line converter Party line converter

1989-11-01

1991-01-15

Schreyer, Stafford D.

Telephonic communications

Polystation line system

Revertive call

379184, 379179, 379180, H04M 170, H04M 1300

Patent

active

049859161

ABSTRACT:
A telephone subscriber interface device provides privacy on a party line. The device provides for revertive calling, break-in, automatic disconnect, selective ringing, automatic number identification, and operates on the central office power supply. The device provides the following features: A connect state for the PLC in which the PLC is connected to the telephone line but in which the PLC is not responsive to other inputs, a ring decoder which detects either divided coded ringing signals or divided ringing signals in a novel manner, means for testing whether a revertive call has been properly terminated, a low power switch so that the PLC can run on telephone line power only without battery backup, and means for resetting the PLC to a ready state in the absence of other inputs.

REFERENCES:
patent: 4219700 (1980-08-01), Panizzon et al.

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