General Discussion
  >> BTwholesale DSL Implementation


Register (or login) on our website and you will not see this ad.


Pages in this thread: 1 | 2 | [3] | 4 | >> (show all)   Print Thread
Standard User Suspishio
(newbie) Wed 19-Oct-11 21:29:25
Print Post

Re: Line Checker


[re: adslmax] [link to this post]
 
In reply to a post by adslmax:
In reply to a post by ib1703:
Around 2-2.2mb rarely 3mb is achieved today. He has option to go for Virgin Media. I think I would recommend that rather than the 7mbps (on FTTC) being offered by BT.


Virgin Media isn't fibre optic at all and overpricing too.


What a strange comment. Virgin Media and BT go head to head on the basis of both being fibre optic albeit with metal sections up to the local fibre optic node.

Suspishio

VM 50 Meg (running at 48 meg)
BT Infinity (running @ 38 meg)

My advice is at your risk.
Standard User Suspishio
(newbie) Wed 19-Oct-11 21:39:19
Print Post

Re: Line Checker


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
Issue here is that the Openreach checker often under estimates, and it may be 15 to 20Meg that they actually get, or maybe even more.

If they can figure out where their local cabinet is, then you can get a good idea http://www.buckconsult.co.uk/fttx/BT8cProfilesVDSL2.jpg shows what you could expect. The line to look at is the 8c one.


I'm somewhat frustrated by the graph. It seems to show that at 5000 feet wire distance, the speed falls to c. 35 Mbps. Is that really the case for the current VDSL profile?

Indeed, AFAIK, 5000 feet is the threshold where BT say that the uplift from ADSL will radically (and disappointingly) degrade. The graph stopped short at the key point.

Suspishio

VM 50 Meg (running at 48 meg)
BT Infinity (running @ 38 meg)

My advice is at your risk.
Standard User acpsd775
(committed) Wed 19-Oct-11 21:43:04
Print Post

Re: Line Checker


[re: adslmax] [link to this post]
 
In reply to a post by adslmax:
In reply to a post by ib1703:
Around 2-2.2mb rarely 3mb is achieved today. He has option to go for Virgin Media. I think I would recommend that rather than the 7mbps (on FTTC) being offered by BT.


Virgin Media isn't fibre optic at all and overpricing too.


Virgin media is a FTTC just like BT infinity the diff been they use coax from cab to you which handles speed way better than bts [censored] phone lines, Plus how is it over priced its 25 quid for 50meg which more often that not proformas at 50meg i had it for 2 year never ever droped below 45meg BTs is 25 quid for upto 40 weather you get 40 or not, Im now on 100meg and it never drops below 95meg except on slower servers but that's hardly virgins fault i also don't consider 35 quid to be over priced either.

Ash

Virgin Media + Sky
-------------------------------------------------------------
2004: Blueyonder 256k/512k => 2006: Blueyonder 2Meg => 2009 Virgin Media 10Meg => 2009/10 Virgin Media 50Meg => 21/04/2011 sky Unlimited 11167 kbps D / 910kbps U 30/9/11 Virgin Media 100Meg

PSN: ACPSD775 add me if you like

[IMG]http://www.speedtest.net/result/1544411348.png[/IMG]


Register (or login) on our website and you will not see this ad.

Administrator MrSaffron
(staff) Wed 19-Oct-11 21:54:45
Print Post

Re: Line Checker


[re: Suspishio] [link to this post]
 
5000 feet from the cabinet

ADSL is measured from the exchange, i.e. a lot further away

Andrew Ferguson, [email protected]
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User Suspishio
(newbie) Wed 19-Oct-11 22:23:26
Print Post

Re: Line Checker


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
5000 feet from the cabinet

ADSL is measured from the exchange, i.e. a lot further away


W|e're not talking about ADSL in the context of the graph link. We're talking about FTTC.

Or have I misunderstood you? My point is that BT regard 5000 feet as the point where at the higher frequencies of VDSL, signal falls off steeply, so steeply as to make it unwise for themn to offer Infinity. The graph link didn't show what happens beyond 5000 feet and in any case I don't believe at current frequency that Infinity would deliver 35 meg at 1 mile wire distance.

Suspishio

VM 50 Meg (running at 48 meg)
BT Infinity (running @ 38 meg)

My advice is at your risk.
Administrator MrSaffron
(staff) Wed 19-Oct-11 22:27:37
Print Post

Re: Line Checker


[re: Suspishio] [link to this post]
 
VDSL2 degrades so that it will run even out to 6000m but at that sort of distance only speeds of around 1 to 2Mbps are possible (18000 feet)

There is no cut out at 15Mbps for FTTC, that is an Infinity (only BT Retail) marketing thing, they will provide a fibre service just not call it Infinity.

Other providers will provide it no matter what.

Andrew Ferguson, [email protected]
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User mr_bean
(member) Wed 19-Oct-11 23:28:38
Print Post

Re: Line Checker


[re: MrSaffron] [link to this post]
 
If they can figure out where their local cabinet is, then you can get a good idea http://www.buckconsult.co.uk/fttx/BT8cProfilesVDSL2.jpg shows what you could expect. The line to look at is the 8c one.
I think that graph is slightly optimistic as

a) it doesn't take into account crosstalk
and
b) it assumes the full 8.5Mhz bandwidth whereas OR's FTTC on 8c is actually limited to just over 7mhz - the difference could be over 15Mbps (although on lines long enough for it to matter probably a bit less).

WWWombat posted a link somewhere to a document containing graphs which took account of crosstalk.
Standard User Bald_Eagle1
(newbie) Thu 20-Oct-11 11:26:10
Print Post

Re: Line Checker


[re: mr_bean] [link to this post]
 
In reply to a post by mr_bean:
If they can figure out where their local cabinet is, then you can get a good idea http://www.buckconsult.co.uk/fttx/BT8cProfilesVDSL2.jpg shows what you could expect. The line to look at is the 8c one.
I think that graph is slightly optimistic as

a) it doesn't take into account crosstalk
and
b) it assumes the full 8.5Mhz bandwidth whereas OR's FTTC on 8c is actually limited to just over 7mhz - the difference could be over 15Mbps (although on lines long enough for it to matter probably a bit less).

WWWombat posted a link somewhere to a document containing graphs which took account of crosstalk.


The graph also appears to start at 90Mb.

As BT's FTTC starts at 40Mb, the speeds achievable at 5000ft (1524m) would surely be much less than 35Mb.

I achieved 32/33Mb when FTTC was first installed on my 800m or so connection from the cabinet, against an estimated 14.6Mb.

After around a month, my speeds had dropped to below 15Mb (following a line fault that left me with no phone or broadband for 4 days).

Following many engineer visits, speed is currently hovering around 20Mb & my ISP tell me that as it is still exceeding my original estimate, they cannot report any faults to BT, despite a continued loss of 12-13Mb or so.

FWIW, having access to an unlocked modem & graphing tools, I see that some days I get absolutely F.A. from the higher frequency VDSL2 downstream D2 band, any downstream being delivered only via the lower frequency ADSL2+ downstream D1 band.


Recent Stats


Paul.

Edited by Bald_Eagle1 (Thu 20-Oct-11 11:44:05)

Standard User ib1703
(newbie) Fri 21-Oct-11 20:33:53
Print Post

Re: Line Checker


[re: Bald_Eagle1] [link to this post]
 
Excuse me if I am being thick here but is VDSL2 what BT are deploying everywhere or are most VDSL and now some exchanges are being upgraded to VDSL2?
Standard User Bald_Eagle1
(newbie) Fri 21-Oct-11 21:34:46
Print Post

Re: Line Checker


[re: ib1703] [link to this post]
 
In reply to a post by ib1703:
Excuse me if I am being thick here but is VDSL2 what BT are deploying everywhere or are most VDSL and now some exchanges are being upgraded to VDSL2?


BT's FTTC already uses VDSL2, profile 8c.
It will still be VDSL2, but using profile 17a (higher frequency, with more bits available to provide higher speeds).

Paul.
Pages in this thread: 1 | 2 | [3] | 4 | >> (show all)   Print Thread

Jump to