System for controlling frequency multiplexing modems
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United States of America Patent
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-
Sep 6, 1994
Grant Date -
N/A
app pub date -
May 7, 1993
filing date -
May 12, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A frequency multiplexing control system includes a first modem unit connected to a transmission line, and a second modem unit connected to the transmission line. The first and second modem units communicate with each other via a plurality of primary channels and a secondary channel. The primary and secondary channels have different frequency bands. A plurality of signal detection units are respectively provided in the first and second modem units, to detect an abnormal primary channel and send to the second and first modem units, information concerning the abnormal primary channel via the secondary channel. A plurality of disabling units are respectively provided in the first and second modem units, to disable the abnormal primary channel in response to the received information and to send a training signal for recovering the abnormal primary channel to the transmission line.
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