The high resistance loop thing is a bit confusing to me - I think your
friend may have been fobbed off.
Devices on a phone line are connected in parallel - so a high resistance
device would draw less power and load the line less, I would have thought.
Telecom exchanges supply a nominal 48 volts DC with a current limit of 80 mA
- so if the combined resistance of the line and the CPE attached is below
600 Ohms, then the voltage will drop.
In any case, the important information is the impedance at the frequencies
that ADSL operates - the resistance is the DC component. If the Sky modem
has low impedance in the ADSL band (25 - 1104 kHz) then it could be dropping
the signal power level and interfering with the DSL router.
If you put a filter in front of the Sky modem and it fixes the problem then
this is probably what was happening.

Jonathon

-----Original Message-----
From: Ian Batterbee [mailto:ian.batterbee@aut.ac.nz]
Sent: Monday, 15 July 2002 19:52
To: adsl@lists.unixathome.org
Subject: DSL dropout problem/solution

I haven't posted for a while, so I thought I'ld share the story of a friend
of mine (who isn't on the list), who recently got DSL and has had no end of
problems with dropouts - usually DSL would bounce within an hour, and often
in much less time.

He followed the correct procedure and rung his ISP, who initially told him
it was a known problem called micro-outages and there was nothing they could
do about it. When he told me this, I told him to call them back and be more
persistant - he did, and they logged a fault with telecom.

Someone came round and looked at it, and determined that the problem was
coming from the modem built into their sky decoder. He was told it was
causing a high resistance loop.

Plugging or unplugging the modem caused DSL to momentarily drop, and leaving
it in there caused it to drop as described above.

Unplugging it completely has left his DSL working for over 50 hours and
counting.

So there you go. Draw your own conclusions.

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This message is part of the NZ ADSL mailing list. 
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and various documents. 
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with "unsubscribe adsl" in the body of the message