Telephone circuit assembly with hook-off detector circuit

Details Telephone circuit assembly with hook-off detector circuit Telephone circuit assembly with hook-off detector circuit

H - Electricity

04

M

H04M 3/22 (2006.01) H04M 19/02 (2006.01)

Patent

CA 2068971

A circuit assembly is disclosed which comprises: an interface circuit (3') between the subscriber line (L) and exchange devices of the kind with two amplifiers connected in a bridge configuration (9A,9B) between the battery (UB) terminals and having a means (15) of detecting the output currents (IA,IB); a supply circuit (5') which includes the exchange battery (UB) and a ring generator (AC'); a switch-over means (7) for putting the line (L) through the interface circuit (3') or the supply circuit (5'); two bridge resistors (RP,RP') which are in series with the line (L) when the latter is connected to the supply circuit (5') and of which one (RP') is connected permanently between one (A) of the line terminals and the output (3A) of one (9A) of the amplifiers, which output is substantially at the potential of one of the battery (UB) poles; an additional resistor (RA), having a much higher resistive value than that of the bridge resistors (RP,RP') and being connected between the other (B) of the line (L) terminals and the output (3B) of the other (9B) of the amplifiers; and a processing means within the interface circuit (3'), which includes said detecting means (15) and is effective to isolate the useful signal (IT) from the line current, recognize a possible hook-off state, and send corresponding signal (OH) to the exchange devices.

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