Answers ( 2 )

    +1
    May 16, 2012 at 12:34 pm
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  1. Larry Moore
    +1
    May 16, 2012 at 20:07 pm
    Reply


    I have clients with their ADSL2+ service attached to their fax lines
    with no problems observed. Perhaps the issue is the fax machines attenuators are not set correctly
    are are to _loud_ on the PSTN. In Australia Telstra advised the signal level received at the exchange
    should be between -15dB and -17dB. They have a Fax On Line Diagnostic
    System (FOLDS) which you can send a transmission to, a report is
    returned advising of the quality of your transmission including measured
    signal and noise levels. In old days the fax machine might have a wired jumper block to set the
    attenuation, more modern devices would be configured from the front
    panel, typically in a maintenance mode. Your good old dial-up modems
    with fax capabilities would have an S-Register or two to set the
    attenuation. Larry.

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