If you do in fact have a loaded line then you are dead in the water. Loading coils are used on longer lines to give lower loss (and hence better speech quality) on the 0.3-4kHz range with the downside (for DSL but not speech) of significantly increasing the attenuation above 4k. Need to go into a bit of transmission line theory to understand how this happens. (By the way the 1st coil is a half section (3000ft) due to the impedance of the exchange equipment.)
 
Cheers
Wayne

        -----Original Message-----
        From: owner-adsl@unixathome.org on behalf of Matthew
        Sent: Wed 14/01/2004 5:32 p.m.
        To: adsl@lists.unixathome.org
        Cc:
        Subject: Re: ADSL modems on dodgy/long lines
        
        

        Ah, there's your culprit. Here's more info -
        http://www.dslreports.com/information/kb/load+coil
        
        
        ----- Original Message -----
        From: "Simon Garner" <sgarner@expio.co.nz>
        To: <adsl@lists.unixathome.org>
        Sent: Wednesday, January 14, 2004 4:58 PM
        Subject: Re: ADSL modems on dodgy/long lines
>
> I should note the house is only 4 years old - it was newly built when I
> first tried to get DSL - so I would expect the internal wiring to be
> decent enough.
>
> One thing I should probably add. When I was doing this four years ago,
> somebody from Telecom (from this list in fact) contacted me and did some
> sort of a test on the line and found there were "loading coils", which,
> he said, would prevent DSL from working. Anybody know what that means?
        
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