Active dipole telephone line protection device

Details Active dipole telephone line protection device Active dipole telephone line protection device

1988-09-29

1989-12-05

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

At substation

379188, H04M 166

Patent

active

048857688

ABSTRACT:
According to the invention, between the two wires (A and B) of the line, an active dipole (DA) is inserted capable of having a low or high impedance. This dipole includes an operational amplifier (AMP) whose output (2) makes it possible to analyze dialling attempts.

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