Communication interface circuit

Details Communication interface circuit Communication interface circuit

H - Electricity

04

M

H04M 7/04 (2006.01) H03H 11/28 (2006.01) H04M 1/24 (2006.01) H04M 1/738 (2006.01)

Patent

CA 2090379

Cas 928 RM/sp COMMUNICATION INTERFACE CIRCUIT ABSTRACT OF THE DISCLOSURE The invention relates to an interface circuit (5) for use with a communication signal generator and two signal lines (4a, 4b) for the transmission of a communication signal thereon, said communication signal having an AC and a DC component, said interface circuit (5) including a DC component setting means (7) for setting the relationship between the voltage and the current of said DC component. The interrface circuit (5) is characterised in that said DC component setting means (7) comprises a current source (9) connectable between said signal lines (4a, 4b) for supplying said DC component with a constant DC current, said current source (9) being responsive to said DC component voltage such that it is operatable only when said DC component voltage exceeds a predetermined value. The interface circuit (5) may be used to adapt a telephone apparatus to the communications signal requirements of a particular country.

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