Pulse or digital communications – Repeaters – Testing
Patent
1981-07-31
1983-05-24
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
34082501, 371 8, 375 10, H04L 122
Patent
active
043853927
ABSTRACT:
A modem fault detector and corrector system including: a first modem including a first transmitter and first receiver and a second modem including a second transmitter and second receiver; switch means for selectively switching the first and second transmitters on and off of a transmission line; and the first and second receivers on and off of a receiver line; and for connecting one of the receivers with the output of either of the first and second transmitters; means for monitoring the status of each of the modems; means for correlating transmit data with receive data; means for sequencing the switch means to enable the means for correlating to compare transmit data selectively with the output of the first transmitter and the second transmitter; and means, responsive to the means for monitoring, the means for correlating, and the means for sequencing for detecting a malfunction in one of the first modem, second modem and transmission-receiver lines and directing the switch means to replace a malfunctioning on-line modem with the off-line modem.
REFERENCES:
patent: 3588824 (1971-06-01), Barker
patent: 4245342 (1981-01-01), Entenman
patent: 4264893 (1981-04-01), Hutch
patent: 4271511 (1981-06-01), Manber et al.
Angell Gary W.
Miller C. Kenneth
Iandiorio Joseph S.
Safourek Benedict V.
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