Mechanism for controlling operation of telephone metallic loop m

Details Mechanism for controlling operation of telephone metallic loop m Mechanism for controlling operation of telephone metallic loop m

1993-04-14

1995-08-08

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379 27, 379 29, 379 34, H04M 124, H04M 308, H04M 322

Patent

active

054406102

ABSTRACT:
The rate of change of a metallic subscriber loop charging characteristic and the period of time elapsed subsequent to the coupling of testing circuitry of a remote test unit coupled to the line are measured. The operation of the testing circuitry within the remote test unit is initiated in response to the rate of change of line voltage reaching a preselected rate of change, prior to the elapsed period of time reaching a prescribed time value. If the measured period of time reaches a prescribed value prior to the monitored rate of change of line voltage reaching the preselected rate of change, the last sampled value of the line voltage is stored and reported to a mechanized loop test system supervisory site.

REFERENCES:
patent: 4641299 (1987-03-01), Kemper et al.
patent: 4709386 (1987-11-01), Shimizu
patent: 5054050 (1991-10-01), Burke et al.
patent: 5073919 (1991-12-01), Hagensick
patent: 5222119 (1993-06-01), Asano

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