[Gllug] UK hit by major ADSL outage

[Pete Ryland]

Actually, from what I gather, ADSL will adjust its frequencies on the fly
based on whereever gets the best S/N ratio.  So adding in interference or
changing the impedance won't affect the line.  A very high impedance tap in
parallel with the line won't change the overall impedance anyway.

However, since we're talking about a PPP encaps, it's all encrypted, using
three-way handshake so it is immune even to person-in-the-middle attacks.
Or is it?

Pete

On Wed, Nov 21, 2001 at 01:47:10PM +0000, John Hearns wrote:
> On Wed, 2001-11-21 at 13:00, Richard Cottrill wrote:
> > Tapping a phone line isn't that hard... 
> 
> I wonder about tapping an ADSL line???
> ADSL works by putting in filters which allow a normal 
> voice call to take place alongside the ADSL data 
> which is sent at higher frequencies.
> 
> I would guess that installing a tap on the line would
> alter impedances, and so disturb this filtering.
> I might be wrong though - an inductive tap, ie.
> coils wound round the phone line might work.
> 
> Have a look at
> 
> 
> http://www.adsl.com/PressRoom/adsl_vs_cable.html
> 
> 
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