Apparatus for the automatic in-circuit testing of subscriber lin

Details Apparatus for the automatic in-circuit testing of subscriber lin Apparatus for the automatic in-circuit testing of subscriber lin

1988-07-19

1989-08-22

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of data transmission

379 27, 379 6, H04M 124

Patent

active

048603325

ABSTRACT:
An automated apparatus and method for in-circuit testing of a subscriber line interface circuit mounted on a telecommunications card. The automated apparatus is capable of testing the functioning of the subscriber line interface circuit: by applying analog voltage to the tip and ring pins and recording the resulting transmit signals, by applying at least one analog voltage signal to the receive pin and recording the resulting signals on the tip and ring pins, by applying onhook and offhock signals to the tip and ring pins and receiving the resulting hook status signal, and by applying a ring command to the ring control pin and recording the resulting ring signal and then applying an offhook signal to the tip and ring pins and receiving the resulting ring trip signal. In conducting these tests, the automated apparatus electrically overdrives any analog or digital signal from associated components on the circuitry.

REFERENCES:
patent: 4577072 (1986-03-01), Lulay

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