Test arrangement for automatic number identification systems

Details Test arrangement for automatic number identification systems Test arrangement for automatic number identification systems

1979-11-19

1981-07-14

Robinson, Thomas A.

179 18FH, H04M 1506, H04Q 372

Patent

active

042788498

ABSTRACT:
A testing arrangement for automatic number identification apparatus is disclosed in a step-by-step telephone system. The "M" leads which apply identification tones to the sleeves of calling lines are periodically scanned for trouble conditions. If an "M" lead is held busy more than a predetermined interval indicating a fault, the test arrangement interrupts the sleeve to release the line finder and the maintenance personnel are notified. The "M" lead is then available for identifying other lines.
The test arrangement periodically tests itself by simulating faults on all "M" leads.

REFERENCES:
patent: 2225305 (1940-12-01), King
patent: 3400228 (1968-09-01), Bubber
patent: 3430000 (1969-02-01), Rohrig
patent: 3851311 (1974-11-01), Mila
patent: 3967074 (1976-06-01), Schillo

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