Automatic retrain method for a full duplex modem having an echo

Details Automatic retrain method for a full duplex modem having an echo Automatic retrain method for a full duplex modem having an echo

1986-12-15

1988-12-20

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

375 8, 375 13, H04L 514

Patent

active

047929405

ABSTRACT:
The invention relates to an automatic retrain method applicable to full duplex data transmission modems which shortens the conventional protocol for retraining in the instance where signal reception can be improved by retraining only the automatic equalizers of the linked modems. If the retrain-initiating modem fails to detect a retrain signal from the linked modem within a predetermined time after transmitting its own retrain signal, the conventional retraining protocol is then adopted in order to retrain both the echo cancellers and the automatic equalizers of the linked modems.

REFERENCES:
patent: 4044307 (1977-08-01), Borysiewicz et al.
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4394767 (1983-07-01), Shum
patent: 4669090 (1987-05-01), Betts et al.
patent: 4694450 (1987-09-01), Staab
Sondhi and Berkley, "Silencing Echoes on the Telephone Network," Proceedings of the IEEE, vol. 68, No. 8, Aug. 1980, pp. 948-963.
Consultative Committee for International Telegraph and Telephone, "Recommendation " v. 32, 1984, pp. 221-238.

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