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Administrator MrSaffron
(staff) Sat 26-Aug-17 10:35:27
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: Ignitionnet] [link to this post]
 
I thought the table was pretty clear about the sharp drop on G.fast....or is comprehension of distance so bad I need to list it in football pitches

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User WWWombat
(knowledge is power) Sat 26-Aug-17 13:05:11
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: Ignitionnet] [link to this post]
 
In reply to a post by Ignitionnet:
If you aren't getting full 80Mb sync due to loss you aren't going to get anything better out of technology that runs at higher frequencies.


Right now, this looks like a decent rule-of-thumb.

Better range is available out of a "raw" G.Fast line, but that would need to reuse the frequencies that VDSL2 is using. That won't be possible in the near future; BT seem to be looking at how to better deal with this. That might turn into something or nothing ... but it is likely to be a way off.
Standard User IanBB
(committed) Sat 26-Aug-17 21:12:27
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: MrSaffron] [link to this post]
 
Is it accurate though?

On fttc I'm 175m from my cabinet as the crow flies, 283m as reported by a GEA test and my router reports 11.6dB attenuation.

Your 2nd table indicates a line length of 500m for an 11dB attenuation with a downstream speed of 38Mbs.

You're not even on the ballpark with that figure!

Edited by IanBB (Sat 26-Aug-17 21:25:10)


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Standard User WWWombat
(knowledge is power) Sat 26-Aug-17 21:58:41
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: IanBB] [link to this post]
 
It is probably best to assume that attenuation figures aren't consistent.

I had one line with an attenuation of 16.5dB, of around 375-400m. Fairly consistent with your figure.

My current line is 8.6dB, and about 100m. I think this one is thinner 0.4mm copper.
Standard User Banger
(eat-sleep-adslguide) Sat 26-Aug-17 22:06:15
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: IanBB] [link to this post]
 
I am at 400m get 79 sync at 19.9 attenuation. How does that stack up?

Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80 Meg LLU Fibre
https://www.thinkbroadband.com/speedtest/15025669961...

Current Sync: 79195/17469

My Broadband Ping
Standard User Zarjaz
(eat-sleep-adslguide) Sun 27-Aug-17 08:34:23
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: WWWombat] [link to this post]
 
The answers aren't so black and white, as ever it's a shade of grey in between, due to all the variables.

NTE to DSLAM for my line is 220m spot on, I see 9db attenuation ...

Administrator MrSaffron
(staff) Sun 27-Aug-17 10:07:01
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: Zarjaz] [link to this post]
 
There is an easy answer delete the table

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User Ignitionnet
(knowledge is power) Sun 27-Aug-17 16:41:57
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
I thought the table was pretty clear about the sharp drop on G.fast....or is comprehension of distance so bad I need to list it in football pitches


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Administrator MrSaffron
(staff) Sun 27-Aug-17 17:03:11
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: Ignitionnet] [link to this post]
 
Ah yes, must say we do not have anywhere near enough compared to the majority of sites that claim to be news sites

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User BatBoy
(sensei) Sun 27-Aug-17 17:48:54
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Re: G.Fast Estimated Speed by BTw Checker Live


[re: MrSaffron] [link to this post]
 
How do you get from the values reported by pbparams to a single figure?
VDSL Band Status	U0	U1	U2	U3	U4	D1	D2	D3
  Line Attenuation(dB):	2.3	14.1	22.5	N/A	N/A	7.6	18.5	29.4
Signal Attenuation(dB):	2.3	13.3	21.8	N/A	N/A	10.8	18.3	29.4
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