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Standard User babis3g
(regular) Wed 09-Mar-16 16:29:26
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Vdsl2 Vplus / Annex Q


[link to this post]
 
Hi, searched but did not find similar topic
According to alcatel-lucent the new Vplus (Annex Q) can be work together with the 17a profile
So the question ... Do will need new hardware modem or our current vdsl2 ones (any brand) can work depending how isp will deploy the (possible) service? example 17a with Vplus (mix)
https://www.alcatel-lucent.com/solutions/vplus

Vplus is also compatible with VDSL2 17a vectoring. That means the 2 technologies can sit side by side in the same local loop, with vectoring used to improve the performance of all lines. This ensures a smooth introduction of Vplus in your VDSL2 network.


Thanks

Edited by babis3g (Wed 09-Mar-16 16:57:18)

Administrator MrSaffron
(staff) Wed 09-Mar-16 17:32:04
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Re: Vdsl2 Vplus / Annex Q


[re: babis3g] [link to this post]
 
All depends on what the operator in the country does...

It usually needs a line card upgrade in the VDSL2 cabinet, this may be a physically different card or might be software based, until all the providers release their hardware it is very much guess work.

VDSL2 Plus is a little like the time when ADSL and ADSL2+ rolled out, i.e. ADSL2+ did not break existing ADSL services.

As for the modem you have at home, given the variation in chipsets and even now not all of them supporting vectoring its impossible to say.

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User babis3g
(regular) Wed 09-Mar-16 18:24:09
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Re: Vdsl2 Vplus / Annex Q


[re: MrSaffron] [link to this post]
 
True, many thanks, lets see how will develop, sound promising this new Annex Q

Edited by babis3g (Wed 09-Mar-16 18:24:43)


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Standard User gt94sss2
(fountain of knowledge) Wed 09-Mar-16 18:27:21
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Re: Vdsl2 Vplus / Annex Q


[re: babis3g] [link to this post]
 
Vplus requires profile 35b which is likely to require new hardware - many modems may support profile 30 but not 35 afaik

Also Vplus would be incompatible with G.Fast (from memory) so you won't see it in the UK.
Standard User WWWombat
(knowledge is power) Wed 09-Mar-16 18:31:03
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Re: Vdsl2 Vplus / Annex Q


[re: babis3g] [link to this post]
 
Vplus is a replacement for profile 30a, going up to either 30MHz or 35MHz.

The point with Vplus is that it is a new profile that is designed to work alongside the old 17a profile, at least when vectoring is in use.

The design of the old profile 30a is that, while it could be used alongside 17a, it couldn't be used with vectoring alongside 17a. The problem was caused because 30a didn't use tones of the same 4.3175kHz width.

Vplus, Annex Q, seems to now be known as profile 35b. It solves the problem by keeping tones 4.3175kHz wide.

http://wholesale.tdc.dk/Produkter/Vplus_TDC_151027-v...

So the question ... Do will need new hardware modem or our current vdsl2 ones (any brand) can work depending how isp will deploy the (possible) service? example 17a with Vplus (mix)


It will need all sorts of new things...
- NICC will need to update the ANFP to allow frequencies above 17MHz to be used
- BT/Openreach will have to choose to buy DSLAM hardware that supports 35b
- Openreach will have to make new speeds available
- ISPs will have to sell new speed packages
- Subscribers will need new 35b modems to get the new speeds
- Subscribers who don't want to upgrade can stay on the existing 17a modems.

Unfortunately, it needs one more thing:
- A G.fast deployment will not be able to use the spectrum from 20MHz to 35MHz

As BT have gone into G.Fast heavily, I don't see them ever deploying Vplus/35b; it will cause them to lose a lot of the speed potential.

If BT decided G.Fast was not viable, they might indeed go back to considering a vectoring upgrade. If that required hardware upgrades, then I'd very much expect them to contemplate including 35b support too.
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