Method and apparatus as for testing a telephone line interface c

Details Method and apparatus as for testing a telephone line interface c Method and apparatus as for testing a telephone line interface c

1989-11-30

1991-04-02

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 29, 379 27, H04M 326

Patent

active

050051970

ABSTRACT:
A telephone line card tester operates by transmitting test data to the digital port of a telephone line interface card, and by subsequently receiving the data which is transmitted from this card through the same digital port. Once received, the data pattern is compared with an expected data pattern. A difference between the received data and the expected data is indicative of a defect in the telephone line interface card. To meet telephone line interface card timing consideration, the transmission of data to the interface card and the analysis of data received from the card are performed by separate subsystems. To accomplish this task, the telephone line interface card is tested in a test fixture which includes a digital line interface card tester, and a communications test set. The communications test set is used for such functions as ring generation and line simulation. The digital line interface card tester is used to exercise the line interface card in a variety of signalling scenarios which simulate the operational environment of the line card. A user interface is also provided.

REFERENCES:
patent: 4167656 (1979-09-01), Durance et al.
patent: 4445007 (1984-04-01), Forestier
patent: 4540857 (1985-09-01), Parsons et al.
patent: 4670897 (1987-06-01), Parsons et al.
patent: 4692939 (1987-09-01), Parsons et al.
Specification Sheet for Wandel & Goltermann AMS-964 Test System 6/87.
Specification Sheet for Northern Telecom DMS-100 Digital line card 9/11/81.

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