Ringing signal supply

Details Ringing signal supply Ringing signal supply

H - Electricity

04

M

379/16

H04M 3/02 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1157596

RINGING SIGNAL SUPPLY Abstract of the Disclosure A ringing signal supply, provided at a concentrator remote from a switching office, compares a fraction of its output with a low level reference ringing signal supplied from the switching office, and uses the comparison result to control a high voltage chopper which connects one of two d.c. supply voltages via a low pass filter to the output to produce the ringing signal at a desired frequency. A d.c.-d.c. forward converter produces the two d.c. supply voltages commonly for a plurality of ringing signal supplies whenever at least one of them is to produce a ringing signal. - j -

384272

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