Telephone ringing generators for subscriber loop carrier...

Details Telephone ringing generators for subscriber loop carrier... Telephone ringing generators for subscriber loop carrier...

H - Electricity

04

M

379/10, 320/11,

H04M 3/02 (2006.01) H04M 1/31 (2006.01) H04M 19/04 (2006.01)

Patent

CA 1063741

TELEPHONE RINGING GENERATORS Abstract of the Disclosure A single channel carrier system for telephone service is disclosed including a remote terminal having a battery charger for charging a battery during idle periods to power the remote carrier electronics. The remote electronics include a ringing generator and supervisory circuits to implement normal telephone supervision over the carrier channel. The ringing generator is a DC-to-DC converter for stepping the battery voltage up to ringing voltage level. This high unipolar ringing voltage is then interrupted at a 20 Hz rate during the ringing portion of the ringing cycle. Simple diodes serve to isolate the unipolar ringing signals from other portions of the circuit.

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