Modem diagnostic loop
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 12, 1991
Grant Date -
N/A
app pub date -
Oct 31, 1988
filing date -
Oct 31, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A modem side diagnostic loopback apparatus for a two wire communication circuit includes a transformer having a mechanism for connecting to a two wire transmission line on a transmission line side and for coupling to a modem on a modem side. A modem transmitter generates modem transmitter signals and a modem receiver receives signals from the transmission line. A subtracting circuit subtracts the modem transmitter signal from a signal containing both the modem transmitter signal and the received signals. The subtracting circuit may be selectively unbalanced so that the transmitter signals are supplied to the modem receiver and the received signals are inhibited from being received by the modem receiver to effect a loopback.
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Family
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Cited Art Landscape
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