You can only really compare attenuation figures on ADSL and ADSL2+ on the same router, or perhaps the same model. Even ones using the same main chipset can vary, for example Thomson and Netgear can differ.

I don't think any of us have found why most moves from ADSL to 2+ seen on these forums get a 3dB'ish rise, but a substantial minority don't. I tend to agree with your thought that it is something to do with the reporting of the attenuation on the higher frequencies, but can't find any evidence to support that. We do kknow of course that those fequencies attenuate much faster than the ADSL ones.

It's an empirical fact as far I'm concerned. Dunno the technical reasoning behind it and not too interested,

I assume the same router.

So I called them and have a new contract, to be activated next week. That will put me on the ADSL2+ at the exchange. Still not sure why my line attenuation is so high given that I'm less than 1km from the exchange. Nothing I can do about that is there?

If you have an Airport extreme reporting an attenuation then you have an very unusual model, since it only has an Ethernet WAN interface.

In reply to a post by RobinsonUK:

So I called them and have a new contract, to be activated next week.

You've been had! You should just have been moved to ADSL2+ on your existing terms. Like everybody else. It may be that you would have moved over automatically anyway in a couple of weeks,(in which case you should have been told that), or it may be you would have needed to get to pay about £11 for an express move taking two days, but it sounds as though you've been conned.

If that doesn't bother you, then no harm done.

Re the high noise margin, read this page so that you know what it is and what it does.

After that, read this one.

In reply to a post by MrSaffron:

If you have an Airport extreme reporting an attenuation then you have an very unusual model, since it only has an Ethernet WAN interface.

Well I have only ever owned one model (MD031ll/A) which as far as I know is far from unusual. Post 7 here http://forums.whirlpool.net.au/archive/1730256 shows exactly the same info shown on mine.

Edited by professor973 (Tue 17-Jul-12 10:43:48)

Im on ADSL2+ and no hardware changes have been done, everything is as original. I have a Speedtouch 536v6 supplied by Telstra connected to an Apple AirPort Extreme router in Bridge mode.

Stats there are from the Speedtouch.

In reply to a post by RobertoS:

You've been had! You should just have been moved to ADSL2+ on your existing terms. Like everybody else. It may be that you would have moved over automatically anyway in a couple of weeks,(in which case you should have been told that), or it may be you would have needed to get to pay about £11 for an express move taking two days, but it sounds as though you've been conned.

Naaa, I don't think so. The new contract is actually cheaper than my existing one (by about £4 per month). Obviously after 12 months that will go up because the first year has a discount (by £6.25). So after 1 year, I'll possibly be £2 per month worse off (boo).

I can't believe the line rental price: £14.50 per month? It's kind-of annoying that I have to pay a "rental" for the line at all. I mean I don't pay "rent" for my mobile. Without the line they can't deliver the broadband anyway!

Ah, so in my case, the stats reported in the Airport are those from the connected Draytek Vigor 120. Nonetheless, as I stated, this setup is still holding ADSL1 Attenuation figures where the Billion has jumped 3 points to 31dB. Either way no problem, I was just wondering if various routers handled the higher frequency losses better than others.

In reply to a post by professor973:

Either way no problem, I was just wondering if various routers handled the higher frequency losses better than others.

I reckon so. I also believe it affects the sync. I found the sync difference between routers roughly corresponded to the attenuation difference.