Test apparatus for a subscriber line

Details Test apparatus for a subscriber line Test apparatus for a subscriber line

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

047078502

ABSTRACT:
An apparatus for enabling the performance loop resistance and DC balance checks on a subscriber line includes relay contacts coupled across the line terminals. 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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