Modem having speed notifying means

Details Modem having speed notifying means Modem having speed notifying means

1991-01-31

1993-01-26

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375 8, 358432, 370 7, 455 72, 381 29, 381 31, H04B 166

Patent

active

051827620

ABSTRACT:
A modem is connected to a terminal equipment and couples to another modem via a transmission line. The modem includes a data transmission and reception part for making data transmission and reception with the terminal equipment, and a modem part for determining a modulation technique, for modulating a transmission signal from the other modem. In addition, the modem includes a data compression and decompression part for determining a compression technique. The compression technique is used for compressing serial data from the data transmission and reception part before supplying the same to the modem part and for decompressing the compressed serial data from the modem part before supplying the same to the data transmission and reception part. The modem further includes a speed determining part, notified of a communication speed between the modem and the other modem determined from the modulation technique and a compression rate of the data compression technique for determining an optimum communication speed when the connection between the two modems is established. In addition, the modulation technique is determined and the data compression technique is determined, in response to outputs of the modem part and data compression and decompression part. The speed determining part notifies the data transmission and reception part of the optimum communication speed, and the data transmission and reception part makes data transmission and reception with the terminal equipment using the optimum communication speed.

REFERENCES:
patent: 3813485 (1974-05-01), Arps
patent: 4124773 (1978-11-01), Elkins
patent: 4385392 (1983-05-01), Angell et al.
patent: 4562571 (1985-12-01), Deman et al.
patent: 4651221 (1987-03-01), Yamaguchi
patent: 4755994 (1988-07-01), Staples et al.
The Reference Manual for "QX/3296c Error-Correcting Modem" manufactured by Microcom, cover page and p. 42.
The User Manual for "MD2400F Intelligent Modem" manufactured by Omron, cover page and pp. 130-133 (no translation).

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