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Standard User dparr59
(committed) Mon 27-Apr-15 16:21:55
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Adsl2+ speed = Fibre Speed What to expect ?


[link to this post]
 
Did a check for fibre came back as high 73.4 Low 54
On asdl2+ i get 20.5 Download only 200 meters from Cabinet ( EO lines before Cabinet sited outside the Exchange )
so i am expecting the full speed 76 -80 meg on plusnet
So could the full speed still be possible ?

thanks

David

plusnet 20 Meg

Edited by dparr59 (Mon 27-Apr-15 23:25:30)

Standard User ip75
(learned) Mon 27-Apr-15 17:02:00
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: dparr59] [link to this post]
 
Do you have a record of your downstream attenuation from when you were on ADSL2+? It's possible to get a reasonable estimate of the actual line length from that. Failing that, what's your downstream attenuation on fibre?
Standard User MHC
(sensei) Mon 27-Apr-15 18:06:46
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: dparr59] [link to this post]
 
200 metres - actual line length or straight line?

If it is actual line length you could well get full speed - I am at 400m or so and have seen 76 Mbps on a speed test, so at half distance you should have an attainable speed up in the 90s.

With straight line distance - who knows!


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

M H C


taurus excreta cerebrum vincit


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Standard User dparr59
(committed) Mon 27-Apr-15 22:05:32
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: ip75] [link to this post]
 
Adsl+2 reading below still on Adsl+2 Fibre due to be installed 20th may

Data Rate (kbps) 23545 _ 1116
Noise Margin (dB) 2.5 _ 7.2
Attenuation (dB) 10.9 _ 4.4
Output power(dbm) 19.9 _ 9.9

200 metres is actual line length

plusnet 20 Meg

Edited by dparr59 (Mon 27-Apr-15 22:09:39)

Standard User ip75
(learned) Mon 27-Apr-15 23:03:12
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: dparr59] [link to this post]
 
An attenuation of 10db ish suggests a line length of around 700m according to a couple of online checkers. I don't know how accurate these are, but that seems more or less in line with your fttc estimate. Is it possible your line takes a less direct route to the exchange, as MHC says?
Administrator MrSaffron
(staff) Mon 27-Apr-15 23:14:01
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: ip75] [link to this post]
 
For standard gauge 0.5mm copper 12dB was generally considered 1km for ADSL2+ frequencies so would go with around 700m too

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User dparr59
(committed) Mon 27-Apr-15 23:44:41
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: MrSaffron] [link to this post]
 
Yes i think your right the cable looks like it goes the long route to me passing me on the other side of the road and up and down 2 cul de sacs, before it gets to me



73.4 High 54 Low _ both nearly the same for telephone number (74.5 ) & address checker ( 74 )
64.8 High 35.1 Low

So is the High figure more likely than the lowest ?

Plusnet Info :
Estimated line speed:
16Mb (This may vary between 14.5Mb and 19Mb)
- Checked on 2015-04-25 14:42:18Current line speed: 20.5 Mb

plusnet 20 Meg

Edited by dparr59 (Tue 28-Apr-15 00:04:56)

Standard User WWWombat
(knowledge is power) Tue 28-Apr-15 16:43:03
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: dparr59] [link to this post]
 
In reply to a post by dparr59:
So is the High figure more likely than the lowest ?


In the middle?

BT come up with the range by comparing your line with the behaviour of all "similar" lines. I take "similar lines" to mean lines with the same/similar attenuation between cabinet and DP.

Looking at this pool of lines, they then take the high point of the range to be the 80th percentile of the pool; the low point comes from the 20th percentile.

So 20% of lines are above the highest speed of the range, 20% are below the lowest speed, and 60% are inbetween. BT seem to accept fault reports when speeds are in the bottom 10%.

The variation across all these lines almost certainly comes from crosstalk, so you should expect your speed to start out high, in the range, and end up lower over time - but likely still within the range.

Note too that these are all line speeds (ie sync speeds). Download speeds will be lower.
Standard User dparr59
(committed) Tue 28-Apr-15 22:36:12
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: WWWombat] [link to this post]
 
i have ordered With plusnet the Ultra fibre or should i cancel and just go for
standard Fibre and if so what speed would standard bring ?

thanks

David

plusnet 20 Meg
Standard User kasg
(fountain of knowledge) Tue 28-Apr-15 22:49:09
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Re: Adsl2+ speed = Fibre Speed What to expect ?


[re: dparr59] [link to this post]
 
I presume you mean "Extra" not "Ultra". Extra will go as fast as your line supports. Standard fibre is capped at 40Mbps download.

Kevin

plusnet Unlimited Fibre - sync approx 65000/20000 at 450m - BQM
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