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Standard User reddev86
(newbie) Fri 05-Mar-10 01:40:52
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FTTC distance from cabinet speed deterioration


[link to this post]
 
I know FTTC is still very new, but I can't seem to find any info which correlates distance to the VDSL2 cabinet, and speed attained. I.E a graph. Lots of ADSL graphs about, even ADSL2+, but no VDSL2.

Anyone have any ideas how much VDSL2 speed deteriorates over copper length?

Apparently BT wont accept a FTTC order if the line won't achieve at least 15mbit, but i'd have thought the line from the cabinet would need to be extremely long to not reach that speed.

2x BE Broadband Pro lines
48Mbit down - 5.4Mbit up

Edited by reddev86 (Fri 05-Mar-10 01:42:47)

Standard User bookey
(experienced) Fri 05-Mar-10 09:35:00
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Re: FTTC distance from cabinet speed deterioration


[re: reddev86] [link to this post]
 
Try this for size. http://www.buckconsult.co.uk/fttx/graphvdsl2.png

BT are really underestimating what people can get.

Ignore the graph above.

BT use Profile 8c from this graph - http://www.buckconsult.co.uk/fttx/BT8cProfilesVDSL2.jpg

Paul

Edited by bookey (Fri 05-Mar-10 12:27:56)

Administrator MrSaffron
(staff) Fri 05-Mar-10 09:38:15
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Re: FTTC distance from cabinet speed deterioration


[re: bookey] [link to this post]
 
Not sure of original source, but I'd suggest that looks a reasonable graph.

The Openreach estimates seem to be low, though only seen one actual versus estimate to start pestering Openreach over this.

Andrew Ferguson, andrew@thinkbroadband.com
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.


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Standard User bookey
(experienced) Fri 05-Mar-10 10:00:37
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Re: FTTC distance from cabinet speed deterioration


[re: MrSaffron] [link to this post]
 
Sorry I don't know the source either, found it while trawling the web ages ago.

Paul
Standard User bookey
(experienced) Fri 05-Mar-10 10:02:42
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Re: FTTC distance from cabinet speed deterioration *DELETED*


[re: bookey] [link to this post]
 
Post deleted by bookey

Edited by bookey (Fri 05-Mar-10 12:28:21)

Standard User Ignitionnet
(fountain of knowledge) Fri 05-Mar-10 10:09:34
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Re: FTTC distance from cabinet speed deterioration


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
Not sure of original source, but I'd suggest that looks a reasonable graph.

The Openreach estimates seem to be low, though only seen one actual versus estimate to start pestering Openreach over this.


It should be noted that there are several varieties of VDSL2 profiles and BT are using profile 8c which isn't capable of the listed speeds.

Page 5 of this PDF gives a graph specific to this profile.

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Administrator MrSaffron
(staff) Fri 05-Mar-10 10:46:35
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Re: FTTC distance from cabinet speed deterioration


[re: Ignitionnet] [link to this post]
 
Ta

Around 32Mbps at 5300 feet, which is around 1.5km (off top of head)

Andrew Ferguson, andrew@thinkbroadband.com
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 Pgre
(committed) Fri 05-Mar-10 12:05:53
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Re: FTTC distance from cabinet speed deterioration


[re: Ignitionnet] [link to this post]
 
So this is the reason for the 15Mb Min.. HD TV.
Which may well define where/why BT are deploying in certain areas..

i.e. is there a link between BT Vision Customers and the current deployment plans...

Or am I perpetuating a conspiracy theory.. smile

Regards PGre
Administrator MrSaffron
(staff) Fri 05-Mar-10 12:15:14
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Re: FTTC distance from cabinet speed deterioration


[re: Pgre] [link to this post]
 
15Mbps HDTV is more down to fitting it onto satellite transponders and getting enough channels so people actually buy HD.

BBC HD is now just about 10Mbps by the way

The lack of contention in the local loop segment will lend itself to a provider having a video cache (e.g. VoD) at the local exchange and people being able to play to their hearts content (well size of wallet)

Andrew Ferguson, andrew@thinkbroadband.com
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 bookey
(experienced) Fri 05-Mar-10 12:22:38
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Re: FTTC distance from cabinet speed deterioration


[re: Ignitionnet] [link to this post]
 
Thanks for that, i'll bin my graphs and use page 5!

http://www.buckconsult.co.uk/fttx/BT8cProfilesVDSL2.jpg

Any ideas why BT are not using other profiles?

Paul

Edited by bookey (Fri 05-Mar-10 12:26:54)

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