Multipoint connected communication system having function of ret

Details Multipoint connected communication system having function of ret Multipoint connected communication system having function of ret

1993-04-19

1994-06-14

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 37, 375 10, 455 88, H04B 138, H04L 2728

Patent

active

053217225

ABSTRACT:
A communication system in which a plurality of multipoint connected satellite stations are connected via 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.

REFERENCES:
patent: 4672630 (1987-06-01), Kaku
patent: 4674103 (1987-06-01), Chevillat et al.
patent: 4736388 (1988-04-01), Eguchi
patent: 4792940 (1988-12-01), Hiraguchi
patent: 4815105 (1989-03-01), Bottoms et al.
patent: 4847880 (1989-07-01), Kamerman et al.
patent: 4910754 (1990-03-01), Allen et al.
patent: 4956852 (1990-09-01), Hodge

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