Multiplex communications – Wide area network – Packet switching
Patent
1993-05-07
1994-09-06
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 76, 371 201, 375 8, 375 13, H04J 114, H04B 138
Patent
active
053454375
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.
REFERENCES:
patent: 4398299 (1983-08-01), Darling et al.
patent: 4847880 (1989-07-01), Kamerman et al.
patent: 4891806 (1990-01-01), Farias et al.
patent: 4922534 (1990-05-01), Garniak et al.
patent: 5052024 (1991-09-01), Moran, III et al.
patent: 5285474 (1994-02-01), Chow et al.
Chin Wellington
Fujitsu Limited
Marcelo Melvin
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