Telephone line interface circuit

Details Telephone line interface circuit Telephone line interface circuit

H - Electricity

04

M

379/3

H04M 11/00 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1205588

TELEPHONE LINE INTERFACE CIRCUIT ABSTRACT OF THE INVENTION A circuit for coupling digital or analog data signals to a telephone line. A direct coupled transistorized circuit is disclosed having three different impedance conditions: on-hook, off-hook, and loop-test. Consequently, data can be transmitted regardless of the on-hook or off-hook status of the associated telephone sets and regardless of whether or not the telephone sets are in use. In addition, data transmission can range over a frequency spectrum of approximately d-c to frequencies in the data-over-voice range. Because of the variable bridging impedance, the drive impedance is not too low during on-hook ringing and the circuit need not be disconnected during ringing or testing.

429962

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