The switch from TTB and ADSL Max to Viviaciti and ADSL2+ has gone through. Yay! Well, actually just half a yay.

I held off going for Annex M to see what kind of speeds plain ADSL2+ would give me first. And these are the new router stats:

ADSL Link Downstream Upstream
Connection Speed 22886 kbps 888 kbps
Line Attenuation 10.0 db 3.5 db
Noise Margin 4.9 db 9.5 db

I'm a bit underwhelmed, to be honest. Downstream is fine, but upstream seems far too low. I expected rather more than an extra 56kbps upstream, having seen lines much longer than mine doing 1Mbit+. The router (DGN2000) is connected directly to the test socket.

Is this likely to be a router issue? Happy enough to buy a new one if it'll improve upload speed. Or should I prod Viviaciti about it?

In reply to a post by DrBC:

Connection Speed 22886 kbps 888 kbps

That 888 K up is a peculiarity of BTw's DLM which caps it at that when on Interleaved. Dunno how Annex M would affect it but as it's designed for high upload it must uncap it.

If you can get full router stats via TELNET (see http://www.kitz.co.uk/routers/netgeardg834_interleav... ) look out for a line like:

D: n 1

n > 1 Interleaved; n = 1 Fast Path.

Or ask ISP to turn Interleaving off and you should get about 1.2 Meg up.

Ahh, that does make things clearer. Thanks.

The router reports 'D: 160 8'. Ran DMT and it confirmed interleaving is on, both upstream and downstream.

I hope you haven't done lots of dis/reconnections.

Not even one so far. Router synced up after the changeover and that's it.

Very nice stats

once annex m is active i would suprised not to see around 2500 upload.

I would very much hope so, but things tend not to be quite that straight-forward!

Opened a ticket with Vivaciti about the interleaving, which they promptly disabled. Router is now syncing at 1027Kbps upstream and downstream has nudged upward too:

ADSL Link Downstream Upstream
Connection Speed 23245 kbps 1027 kbps
Line Attenuation 11.0 db 3.6 db
Noise Margin 5.8 db 6.7 db

But 1MBit is still rather less than I expected from this line, which makes be wonder if Annex M would actually deliver 2Mbit+ speed. And on the subject of Annex M, Vivaciti have informed me that it is not available with the package I'm on and I'd have to switch to a peak-time metered package in order to get it. Ho-hum.

We can do Annex M on your package, but it's quite expensive to sign up to or migrate to so we do not offer it, but we can do it is you want, I think from memory the fee is £75.00 + VAT just to connect to it.