Multipoint communication system with retraining of modems

H - Electricity – 04 – L

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340/74

H04L 1/00 (2006.01) H04L 1/20 (2006.01) H04L 1/24 (2006.01) H04L 5/14 (2006.01)

Patent

CA 2021539

A communication system in which a plurality of multipoint connected satellite stations are connected via a down line and an up line to a master station. Each of the satellite stations monitors presence or absence of occurrence of an abnormality in the down line, judges whether the abnormality is present or not and, where the abnormality is present, informs the master station of the nature of the abnormality via the up line. In turn, the master station monitors presence or absence of an alarm indicating abnormality from each of the satellite stations, judges whether the alarm is detected or not and, where the alarm is detected, reads past record information concerning abnormality detection in the satellite station concerned and information on retraining execution time, then judges whether the down line is normal or not and, where the down line is normal, sends a training signal again to the down line to retrain a MODEM corresponding to the satellite station concerned. Accordingly, it is possible to quickly restore demodulation processing by each of the satellite stations to a respective normal status after a recovery of trouble in a down line.

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