Testing transmission links

Details Testing transmission links Testing transmission links

1987-11-04

1989-03-21

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

34082552, H04M 326

Patent

active

048151190

ABSTRACT:
A multichannel automatic remote line testing system enables telephone lines connected to a common highway to be individually tested from the exchange. Pulse code modulation of an audio tone provides address codes which are checked by the remote line testers and responded by the tester whose programmed address corresponds to the particular code sent. Validation circuits check the frequency, encoding and duration of the command.
Pulse Code modulation echoes are used to confirm interactive operation.

REFERENCES:
patent: 3943305 (1976-03-01), Hagedorn
patent: 4258236 (1981-03-01), Conkin
patent: 4686696 (1987-08-01), Lynch

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