Telecommunication system with automatically switched modems

Details Telecommunication system with automatically switched modems Telecommunication system with automatically switched modems

1975-05-05

1977-03-22

Safourek, Benedict V.

325 10, 325 3, H04B 144

Patent

active

040139565

ABSTRACT:
A telecommunication system in which two terminal stations are coupled to one another via a telephone exchange and the transmission paths between the exchange and the terminal stations are provided with pairs of modems for transmitting, via the transmission paths, information signals of modulation types which are different in the terminal stations and in the transmission paths, the modems nearer to the exchange being switched off by means of an auxiliary signal the frequency of which corresponds to a component of the frequency spectrum of the modulation type employed in the transmission path. Thus information transmission in the telephone exchange is obtained in the same modulation type as employed in the transmission paths so that unnecessary conversion from one type of modulation to the other is avoided.

REFERENCES:
patent: 3254159 (1966-05-01), Condict
patent: 3366880 (1968-01-01), Driver
patent: 3743938 (1973-07-01), Davis
patent: 3917907 (1975-11-01), Bartelink

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