Multiplex communications – Wide area network – Packet switching
Patent
1986-09-18
1988-09-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375 8, H04B 312, H04J 1500
Patent
active
047714174
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 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: 4438511 (1984-03-01), Baran
patent: 4481622 (1984-11-01), Cheng et al.
patent: 4653044 (1987-03-01), Kudo
CCITT Recommendation T.30.
LSI 24/24 Data Modem User Manual, Dec. 1979, Codex Corporation.
Maxwell Ronald K.
Prasad Venkat
Smith Fred G.
Yoshikawa Harunori
Zorzi Karl J.
Olms Douglas W.
Racal Data Communications Inc.
Scutch III Frank M.
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