Apparatus for connecting and disconnecting a ringing signal to a

Details Apparatus for connecting and disconnecting a ringing signal to a Apparatus for connecting and disconnecting a ringing signal to a

1988-09-12

1990-03-13

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

H04M 174, H04M 300

Patent

active

049088548

ABSTRACT:
The present invention relates to an apparatus in ringing signaling to a called subscriber. Connection and disconnection of the signal takes place with the aid of the apparatus. The problem solved by the invention is that of current transients being generated on disconnection of the signal, these transients causing a disturbing clicking noise in the engaged telephone of a subscriber in a neighboring channel. The apparatus solving the problem includes a two-way switching circuits (10) connected in series with an AC voltage generator (2), said circuit disconnecting the AC voltage to a bell (1) when the current through the bell has its zero crossing, and a discharge circuit (11) for the discharging the bell before it is connected via a relay (3) to a SLIC circuit (4), such that the voltage across the bell is within the SLIC circuit voltage interval when the relay (3) connects the bell to the SLIC circuit (4), which occures when said signal is disconnected. By this arrangement an overvoltage protector (7) connected to the SLIC circuit (4) is not triggered, and the circuit is not subjected to any current transient which can cause disturbing clicking noises.

REFERENCES:
patent: 4152549 (1979-05-01), Ceruti et al.

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