Method and apparatus for providing a ground reference for...

Details Method and apparatus for providing a ground reference for... Method and apparatus for providing a ground reference for...

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) H04Q 1/38 (2006.01)

Patent

CA 1252585

METHOD AND APPARATUS FOR PROVIDING A GROUND REFERENCE FOR TELEPHONE CUSTOMER SPECIAL CIRCUITS POWERED FROM A FLOATING BATTERY FEED Abstract When a floating battery feed circuit is used to power telephone lines, it is desirable to provide an anti-corrosion biasing circuit to keep the voltage on tile tip and ring conductors from becoming positive. This can be done using an anti-corrosion circuit that sinks a dynamic amount of current from the tip conductor. A line circuit including such biasing is, however, incompatible with special lines such as PBX lines that rely on a grounded tip conductor in the talk state. In accordance with the present invention, a constant current is supplied from a ground reference circuit to the ring conductor of such special lines only when loop current is flowing. The magnitude of this supplied current is such that the anti-corrosion circuit holds the tip conductor sufficiently close to ground potential to allow the proper operation of circuits connected to the special lines.

514071

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