System for controlling frequency multiplexing modems
First Claim
1. A frequency multiplexing control system comprising:
- a first modem unit connected to a transmission line;
a second modem unit connected to said transmission line, the first and second modem units communicating with each other via a plurality of primary channels;
a secondary channel provided between the first and second modem units, the secondary channel having a frequency band lower than frequency bands of the primary channels;
a plurality of first means, respectively provided in the first and second modem units, for detecting an abnormal primary channel and sending to the second and first modem units information concerning the abnormal primary channel via the secondary channel; and
a plurality of second means, respectively provided in the first and second modem units, for disabling the abnormal primary channel in response to said information and for sending a training signal for recovering the abnormal primary channel to the transmission line, via the secondary channel.
1 Assignment
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Accused Products
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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Citations
10 Claims
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1. A frequency multiplexing control system comprising:
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a first modem unit connected to a transmission line; a second modem unit connected to said transmission line, the first and second modem units communicating with each other via a plurality of primary channels; a secondary channel provided between the first and second modem units, the secondary channel having a frequency band lower than frequency bands of the primary channels; a plurality of first means, respectively provided in the first and second modem units, for detecting an abnormal primary channel and sending to the second and first modem units information concerning the abnormal primary channel via the secondary channel; and a plurality of second means, respectively provided in the first and second modem units, for disabling the abnormal primary channel in response to said information and for sending a training signal for recovering the abnormal primary channel to the transmission line, via the secondary channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification