Remote isolation test apparatus

Details Remote isolation test apparatus Remote isolation test apparatus

1986-10-29

1987-11-17

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 30, H04M 124, H04M 328

Patent

active

047078510

ABSTRACT:
A remote isolation apparatus includes double-position switch for selectively coupling or isolating a telephone company central office and a multi-wire subscriber line. The switch operates according to a remotely originated activating signal so that, until the switch is operated, the central office is connected to the subscriber line through normally closed contacts. When the switch is operated, the central office TIP and RING leads are coupled to a reference terminal, and the central office is isolated from the subscriber line.
The apparatus includes circuitry for detecting the application of an activating signal to the line and for optically coupling a resulting trigger signal to a pair of monostable timers. The timer output pulses are arranged so that the relay is energized subsequent to the removal of the activating signal and remains energized during an interval established by the relative durations of the timer output pulses.

REFERENCES:
patent: 4169220 (1979-09-01), Fields
patent: 4434328 (1984-02-01), Fields
patent: 4550225 (1985-10-01), Lynch et al.

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