Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
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
Schreyer Stafford D.
STC PLC
LandOfFree
Testing transmission links does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Testing transmission links, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing transmission links will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-484469