Patent ID: 8369510

Claim:
A method for ring-trip detection in a line card, comprising: using an analog-to-digital converter for processing voice signals; receiving a ringing control signal; transmitting a ringing signal to a subscriber line in response to the ringing control signal; receiving a portion of the ringing signal from the subscriber line; converting the portion of the ringing signal to a digital signal using the analog-to-digital converter; transmitting the converted digital signal to a ring detection unit and then to a digital interface, the digital interface being adapted to transmit a ring control signal to a ring generator; generating a ring-trip indication at the ring generator in response to receiving the ring control signal; transmitting the ring-trip indication through a switch to a digital-to-analog converter, the digital-to-analog converter being adapted to convert the ring-trip indication to an analog signal; and providing the converted, analog ring-trip indication.