VDSL2 Profiles

When will BTw going to upgrading from profiles 17a to 30a to get a possible 160Meg down and 40Meg up?

http://s28.postimg.org/qd0ic0ctp/Profiles.jpg

Hopefully not until after the network is capable of handling what is already provided.



edit- remove misleading "ownership" implications.

Edited by billford (Wed 19-Mar-14 08:38:03)

Haven't seen it on the Openreach roadmap at all. The only change on the roadmap was 8a -> 17a and that was done a while ago.

30a is really intended for FTTB.

Why? The only users likely to see any significant improvement will be those already getting near an 80/20 sync. In the 70's there will be some and I would guess that anyone currently getting 60 will a minimal improvement.

So, a large expense for BT in testing and rolling out firmware upgrade for no returns.

And why is it needed? 80/20 is adequate for almost every residential and small business installation. Any business that can justify a faster connection should be looking at non-VDSL solutions.

In reply to a post by MHC:

And why is it needed? 80/20 is adequate for almost every residential and small business installation. Any business that can justify a faster connection should be looking at non-VDSL solutions.

i suppose thats a question to ask all the VM users on here who've just upgraded to 152 (most getting close to 160) lol they obviously feel the need,

Ash

In reply to a post by acpsd775:

In reply to a post by MHC:

And why is it needed? 80/20 is adequate for almost every residential and small business installation. Any business that can justify a faster connection should be looking at non-VDSL solutions.

i suppose thats a question to ask all the VM users on here who've just upgraded to 152 (most getting close to 160) lol they obviously feel the need,

Ash

Perhaps they are hoping such high speeds will reduce the jitter down to manageable levels

Basically g.fast/vectoring before 30a.

vectoring more better than pushing up the profile in my opinion, vectoring is currently in field testing.

Will it go to CP trials do you think?

It isn't worth them doing 30a within the current cabinets - the percentage of properties that are close enough to benefit is too low, perhaps only 20% or so.

The only way it would be worthwhile is for them to change the infrastructure, and place cabinets a lot closer to the home - within 200 metres or so. But that kind of change is perhaps better envisaged as FTTdp using the newer G.fast system instead. That goes to over 100MHz instead.

Right now, BT seem to be concentrating on coverage - on getting more people covered by FTTC, and then on increasing the range of the existing cabinets.

As everyone else has said, vectoring technology helps them achieve that as well as enhancing the speed for those closer to the cabinet. It is a far more suitable technology for the way BT are currently deploying FTTC. Adding G.INP to the mix also helps, by reducing the overhead from FEC+interleaving.

BT has made their choice obvious in setting the specifications for ISP's to supply their own self-install modems. They have specified that the modems must support vectoring and G.INP, but only profile 17a. No mention of 30a.

It depends what you mean by CP trials.

The phase 1 trials have used real customers, just a limited geographical area (in Barnet and Braintree).

BT seem to want to run some phase 2 trials, using improved hardware, in the same location.

its not as simple as that either, I have a cabinet 20m from me, but cabinet coverage isnt a perfect circle its more like a banana moon shape. Even with that taken into account I am 200m or so from my cabinet by road but my actual distance is nearly 440m (info provided to me by openreach). So I have a copper length of nearly 440m even tho I am 20m from a cabinet, because BT made the decision to not optimise D side's, as you said they just want coverage of the service rather than making it as good as possible.

Edited by Chrysalis (Fri 21-Mar-14 02:52:55)

Thanks for the info WWWombat,
I suppose I was just wondering what the chances of getting to try it out would be.
Unlike other trials they are probably dealing with individual cabinets rather than enabling entire exchange areas and allowing random trialists to sign up.
Cheers,
flipdee

In reply to a post by Chrysalis:

So I have a copper length of nearly 440m even tho I am 20m from a cabinet, because BT made the decision to not optimise D side's, as you said they just want coverage of the service rather than making it as good as possible.

Zero commercial case to do so. No operator is going to do that for free.

Yes, my understanding is the same: the trials are for a very limited number of cabinets, but everyone on those cabinets is compelled to take part.