Vectoring

Spotted the following in a news article ontelecompaper

Shows that vectoring is giving 100Mb over 300m and is being rolled out in the EU. It will be interesting to see when this is rolled out in the UK.

Huawei Poland announced completion of the final phase of work on its vectoring system, thereby enabling mass deployment. The system developed by Huawei can reach speeds of over 100 Mbps over a distance of up to 300 meters over a single copper pair. Copper cables in Poland are available in almost 100 percent of premises, office and residential. In 2009, Huawei presented a prototype of vectoring and carried out the first tests in collaboration with BT and Swisscom. However, the development of vectoring faced problems of compatibility with the older generation of subscriber devices operating in existing networks. To overcome this, Huawei has developed the Auto Sense Function that automatically identifies the user terminal equipment and thereby applies appropriate operation on the DSLAM. As of April, Huawei provided globally more than 1.2 million VDSL2 vectoring lines.

http://community.plus.net/forum/index.php/topic,1142...

http://www.ispreview.co.uk/index.php/2013/04/bt-conf...

Watching & Waiting!

In reply to a post by shalom2005:

http://community.plus.net/forum/index.php/topic,1142...

http://www.ispreview.co.uk/index.php/2013/04/bt-conf...

Watching & Waiting!

Me too. I reckon my line will be a good test. It started off syncing at 79999 with (I think) 91 attainable. 12 months later and it just had DLM remove interleaving and it's connected at a tad under 72.

this line is telling

As of April, Huawei provided globally more than 1.2 million VDSL2 vectoring lines.

someone on here said to me there is no live use yet its barely out the labs :

In reply to a post by Chrysalis:

this line is telling

As of April, Huawei provided globally more than 1.2 million VDSL2 vectoring lines.

someone on here said to me there is no live use yet its barely out the labs :

Just goes to show, no one knows everything!

In reply to a post by Andrue:

In reply to a post by shalom2005:

http://community.plus.net/forum/index.php/topic,1142...

http://www.ispreview.co.uk/index.php/2013/04/bt-conf...

Watching & Waiting!

Me too. I reckon my line will be a good test. It started off syncing at 79999 with (I think) 91 attainable. 12 months later and it just had DLM remove interleaving and it's connected at a tad under 72.

Likewise at 450m with 46meg sync I'm well under the "typical" curve. At least mine is stable, but its always been interleaved.

If you go to the Main Site and search the News Articles for Vectorin there are eleven hits. This one is probably the best for now.

In reply to a post by jchamier:

Likewise at 450m with 46meg sync I'm well under the "typical" curve. At least mine is stable, but its always been interleaved.

This document, from the Broadband Forum, has an interesting graph - Figure 6.

It shows both vectoring behaviour, existing behaviour with crosstalk, and the worst-case behaviour, for the 17a profile on 0.4mm wire. That suggests 100Mbps over 500 metres, showing the Polish results aren't so outstanding.

That graph shows your speed is very much at the worst-case speed for your distance.

ADTran have a "what's next" presentation that shows a distance of 400 metres for 100Mbps, on 0.4mm wire, but also state that vectored reach should be multiplied by 1.3 for 0.5mm wire.

Finally, Alcatel-Lucent have a paper on their trial results, showing that recent results are an improvement over early results from 2010-2011. Those trials show 100Mbps at 500 metres, with a statement "Wire diameter and cable type do have an impact on the results and account for most of the variation [...] with commercial equipment".

what about 0.2 wire and ali ?

You have 0.2mm wire? That's incredibly thin - and is more usually seen when combined in multi-stranded cable, which we don't tend to see as telephone cable. I wouldn't expect VDSL2 to go very far at all on that.

I thought we tended to get, in the D-side, more 0.5mm stuff, some 0.4mm stuff and some 0.9mm stuff.

(In my old neighbourhood, some blocks of flats got markedly higher speed predictions compared to the nearby houses. The best explanation would be that they were fed by a batch of 0.9mm cable)

Aluminium - well, we all know it attenuates the VDSL2 signal more, so has a reduced range. However, I don't think anyone has quantified it well enough - partly because you can't tell how much aluminium is in the line.