Circuits and methods for initializing the loop current of a...

Details Circuits and methods for initializing the loop current of a... Circuits and methods for initializing the loop current of a...

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) H04M 1/60 (2006.01) H04M 1/76 (2006.01)

Patent

CA 1154184

Abstract: The loop current of a telephone set speech network is automatically initialized at a desired level independent of the central office voltage applied to the input terminals of the set and thus independent of transmission line loop length and other variables. For this purpose, a variable conductance device, such as a Darlington driver, is connected between the input terminals and the speech network so as to establish a loop current at a circuit node that is a function of the supply voltage and the conductivity of the device, The loop current is monitored, as by a Schmidt trigger circuit, and the conductance of the device is varied accordingly so as to initialize the loop current at the desired level as by selectively connecting a plurality of resistors individually and collectively between a base node of the driver and the ring lead of the set.

358879

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