System and method for verifying central office wiring...

Details System and method for verifying central office wiring... System and method for verifying central office wiring...

2007-07-17

2007-07-17

Tran, Quoc (Department: 2614)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of data transmission

C379S001040, C379S022010, C379S022040, C379S024000

Reexamination Certificate

active

10945512

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.

REFERENCES:
patent: 6373923 (2002-04-01), Williamson et al.

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