Circuit arrangement for protecting a subscriber circuit of a tel

Details Circuit arrangement for protecting a subscriber circuit of a tel Circuit arrangement for protecting a subscriber circuit of a tel

1996-12-19

1999-08-10

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361 91, H02H 322

Patent

active

059368233

ABSTRACT:
Circuit arrangement for protecting a subscriber circuit of a telecommunication system for the balanced-to-ground connection of a subscriber line to which a ringing voltage source is connected unbalanced to ground via an electromechanical or electronic switch upon simultaneous disconnection from the subscriber circuit for call signalling against inductive over-voltages that occur upon reconnection to the subscriber line, characterized by a two-way threshold circuit (D) with symmetrical pass/stop characteristic whose threshold voltage is higher than the peak voltage of the ringing voltage source (UGR) that is connected between the leads (a, b) of the subscriber line.

REFERENCES:
patent: 4661979 (1987-04-01), Jakab
patent: 5572397 (1996-11-01), Smith et al.

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