Channel board for telephony transmission equipment using single

Details Channel board for telephony transmission equipment using single Channel board for telephony transmission equipment using single

1975-08-27

1977-01-04

Claffy, Kathleen H.

H04J 108

Patent

active

040015114

ABSTRACT:
A channel board which simplifies wiring.
Each channel board 30-31 comprises its own controlled carrier current generator for the formation of primary groups, and preferably also for the direct formation of the secondary groups from pre-modulated channels. The requisite carrier current is obtained by controlling the value of the divisor N in the frequency divider contained in the feedback loop. The control of N is effected for example simply by inserting the channel board into its location or by providing in addition with a selector plug, or by means of loaded shift registers.

REFERENCES:
patent: 3505479 (1970-04-01), Hodge
Johansen, "Transmission of Sound Programmes on Carrier Systems for Telephony," Ericsson Review, vol. 47, No. 2, 1970, pp. 64-72.

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