High speed modem

Details High speed modem High speed modem

1988-08-29

1990-05-08

Orsino, Joseph A.

Multiplex communications

Wide area network

Packet switching

370 64, 375 8, H04J 1500

Patent

active

049244566

ABSTRACT:
A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing between lower-speed, interactive operation and higher-speed operation based upon data transmission demands. The operation is controlled by a processor monitoring the contents of a transmit data buffer and providing a mode control command to the modem transmitter. The modem also adapts its speed to the quality of the telephone line by fallback or fallforward to a different speed based upon predetermined data frame retransmission criteria.

REFERENCES:
patent: 3956589 (1976-05-01), Weathers et al.
patent: 3990046 (1976-11-01), Katz et al.
patent: 4425664 (1984-01-01), Sherman et al.
patent: 4756007 (1988-07-01), Qureshi et al.
patent: 4780883 (1988-10-01), O'Connor et al.

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