Dmt test method for determining adsl capability of cables

Details Dmt test method for determining adsl capability of cables Dmt test method for determining adsl capability of cables

H - Electricity

04

M

H04M 3/26 (2006.01) G01R 31/00 (2006.01) H04B 3/46 (2006.01) H04L 1/24 (2006.01) H04L 12/26 (2006.01) H04L 27/26 (2006.01) H04M 3/30 (2006.01) H04M 11/06 (2006.01) H04Q 1/45 (2006.01)

Patent

CA 2297871

A DMT (Discrete Multi-Tone) test method is provided. The test method is employed by two test devices to estimate the theoretical and practical data rates of a cable under test for a pair of target ADSL (Asymmetric Digital Subscriber Line) DMT modems. The present DMT test can also be used to analyze the cause of, or to predict a problem, whereby a pair of ADSL DMT modems could fail to synchronize. The method includes (a) synchronizing two devices at lower frequencies; (b) measuring the frequency characteristics of the cable with test signals; (c) measuring the cable noise and interference for every sub-channel of the ADSL bandwidth; (d) determining the theoretical and practical data rates for every sub- channel, based on the measured frequency characteristics and noise characteristics, as well as modem parameters selected by the user; (e) estimating the theoretical and practical data rates for the ADSL bandwidth based on the ADSL DMT standard selected by the user.

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