System and method for verifying central office wiring associated with line sharing

Abstract

A system and method for verifying the integrity of a DSL circuit on a shared telephone line. The invention uses the amplitude modulation principles to overcome the difficulty associated with a blocking capacitor that isolates a DSLAM on the DSL circuit from the rest of the shared telephone line. A transmitter of the invention mixes a high frequency carrier signal and a low frequency audio signal to produce an amplitude-modulated test signal. The amplitude modulated signal is supplied to the telephone line at a main distributing frame side of the blocking capacitor and is detected by a receiver at the DSLAM side of the blocking capacitor.

1 . A transmitter for verifying connectivity of a shared telephone line comprising: 
 a high frequency oscillator for generating a carrier signal;    a low frequency oscillator for generating an audible signal;    an amplitude modulator in communication with each of the high frequency oscillator and the low frequency oscillator, wherein the amplitude modulator mixes the carrier signal and the audible signal to produce and amplitude-modulated test signal;    a high-pass filter in communication with the amplitude modulator, wherein the high-pass filter receives the amplitude-modulated test signal and removes any residual low frequency signal output by the amplitude modulator; and    a connector in communication with the high-pass filter, wherein the connector is adapted to send the amplitude-modulated test signal to a central office side of the telephone line.    
   
   
       2 - 28 . (canceled)