Method of generating a ring signal in a subscriber line...

Details Method of generating a ring signal in a subscriber line... Method of generating a ring signal in a subscriber line...

2005-12-06

2005-12-06

Kuntz, Curtis (Department: 2643)

Telephonic communications

Subscriber line or transmission line interface

C379S413010, C379S388060, C379S390010

Reexamination Certificate

active

06973181

ABSTRACT:
In a method and a device for controlling the magnitude of the generated ring signal in a the Subscriber Line Interface Circuit (SLIC) the voltage of the A and B lines to the subscriber from the SLIC is compared to a reference voltage. The device is arranged to control the magnitude of the generated ring signal voltage in response to the outcome of the comparison. In particular, the device is arranged to control the ring signal voltage so that the ring signal voltage is reduced if the voltage on the A or B line exceeds the reference voltage. Also, the reference voltage is preferably chosen so that there is no risk for saturation of the final stages. The reference voltage is preferably selected to have a value being related to the value of the negative supply voltage.

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