I think you are still on ADSL (G.DMT) Dubs where you should really be on ADSL2+ (G.992.5), after all you are paying for it and your line should be able to support it. It's possible Sky do not have enough equipment on your exchange to switch you over to the faster connection but you really need to ask.
I doubt if you are on an Interleaved line with that attenuation so Maxdelay probably doesn't apply.
Do a ping to bbc.co.uk, if it's around 20-30ms then you are on FAST and if it's 50-60 you'll be on Interleaved as it adds 32ms to the ping time to help with error control on longer lines.
- ADSL2+ is an option for all LLU customers.
- Nothing to do with Sky equipment or lack of it.
- It is interleaved and Sky wish to keep it that way - although technically speaking, outside of their policy, it is of course possible to switch to fastpath.


), so connecting the modem on an extension would get you nothing.