Transmission speed switching system

Details Transmission speed switching system Transmission speed switching system

1978-04-20

1980-11-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 86, H04L 2718

Patent

active

042362482

ABSTRACT:
A transmission speed switching system for a transmission system having at each party of said transmission system a plurality of data MODEMs of different transmission speeds b.sub.1, b.sub.2, . . . b.sub.n, in which a carrier is modulated by a code train at intervals of a time S equal to a common multiple of symbol intervals S.sub.1, S.sub.2, . . . S.sub.n respectively corresponding to the transmission speeds in a manner to obtain a predetermined modulated wave which instructs said MODEMs of the other party the switching to a specified one of the transmission speeds, and in which the modulated wave is transmitted to the receiving station so that a demodulated code by a demodulator of any of the transmission speeds may be interpreted as the code train indicating the specified transmission speed to be selected by the receiving station, thereby switching the transmission speed to the specified one corresponding to the result of the interpretation.

REFERENCES:
patent: 3359543 (1967-12-01), Corr et al.
patent: 3775751 (1973-11-01), Anderson
patent: 3987422 (1976-10-01), Yanagidaira et al.
patent: 4001504 (1977-01-01), Hendrickson

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