Patent ID: 8897348

Claim:
A method for diagnosing twisted pair wiring, comprising: converting an input waveform comprised of digital audio data into an analog audio signal having a frequency less than or equal to 20 kHz; transmitting the analog audio signal onto twisted pair wiring; sensing current in response to transmitting the analog audio signal over the twisted pair wiring; generating, from an analog signal corresponding to the sensed current, a digital output waveform comprised of delay samples and measurement data produced in response to the frequency; identifying where the measurement data appears in the digital output waveform by enabling loopback mode, determining a sample delay from when a given sample is transmitted in the loopback mode and when the given sample is received, and synchronizing the input waveform and the output waveform at a single analog/digital (A/D) sample using the sample delay; and determining, in response to identifying where the measurement data appears in the digital output waveform, electrical properties of the twisted pair wiring from the measurement data in the digital output waveform.