Pulse or digital communications – Transceivers – Modems
Patent
1994-09-08
1996-06-04
Safourek, Benedict V.
Pulse or digital communications
Transceivers
Modems
375225, 375377, H04L 2908
Patent
active
055241220
ABSTRACT:
A transmission system wherein the data transmission rate is optimized for communication between modems which are each capable of operating at various transmission rates and wherein the transmission medium is of variable quality. Prior to synchronization each modem determines an optimum transmission rate based on line quality, and during a synchronization setup phase the modems exchange information identifying their minimum and maximum acceptable transmission rates. An initial transmission rate is adopted and then adjusted up or down, depending on line quality, so that the rate is as close to the optimum rate as is consistent with line quality and the rates acceptable to both modems. Thus, the optimum rate calculated by each modem is taken into account and is imposed on the remote modem only if the latter is capable of operation at that rate. The system is therefore highly flexible and also reliable.
REFERENCES:
patent: 4736388 (1988-04-01), Eguchi
patent: 4991184 (1991-02-01), Hashimoto
patent: 5157651 (1992-10-01), Ghelberg et al.
patent: 5214637 (1993-05-01), Sridhar et al.
patent: 5247546 (1993-09-01), Abbiate et al.
Lepitre Didier
Picart Catherine
Eason Leroy
Safourek Benedict V.
U.S. Philips Corporation
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