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How is Plusnet estimated line speed calculated

Community Veteran
Posts: 38,460
Thanks: 1,027
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Registered: 15-06-2007

How is Plusnet estimated line speed calculated

Quote
Estimated line speed:
    4.0 - Checked on 2010-12-09 04:04:44
Current line speed:
    3500

Fact is that to achieve an IP profile of 4000kbps I would need a sync rate in excess of 4544kbps and given my current stats are
Noise Margin:    5.9  dB
Connection Rate:  4160  Kbps
with no line drops for 27 days and a noise margin which hasn't moved outside the 4.7 - 6.9dB range  since the 19th November
13 REPLIES
jojopillo
Grafter
Posts: 9,786
Registered: 16-06-2010

Re: How is Plusnet estimated line speed calculated

Hi Jim,
The estimate is derived from the BT availability checker.
Jojo Smiley
Community Veteran
Posts: 38,460
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Registered: 15-06-2007

Re: How is Plusnet estimated line speed calculated

You just knew what the next questions were don't you  Embarrassed
How does that calculate it and why has it increased whereas my attenuation hasn't changed
Note sync speed hasn't dropped below 4000 since mid September and the maximum ever was 4480kbps
Just to add - if the BT value is sync speed then it needs to be clearly differentiated from Current Line Speed which is the IP profile and typically 500+ kbps lower
Force9Original
Grafter
Posts: 352
Registered: 05-02-2010

Re: How is Plusnet estimated line speed calculated

Radial Distance Calculator   if memory serves......
Attenuation figs can also vary , due to  Router chipset & how their read data line data.
Your attenuation will be higher if your paired an IFTN router chipset to your IFTN DSLAM.  On the other hand a Trend chip would lower it , but at loss of stability Wink
thx f9o
Community Veteran
Posts: 38,460
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Registered: 15-06-2007

Re: How is Plusnet estimated line speed calculated

Router and reported attenuation haven't changed either
jojopillo
Grafter
Posts: 9,786
Registered: 16-06-2010

Re: How is Plusnet estimated line speed calculated

Hi Jim,
The figures from the availability checker is apparently sync rate and not profile speed.
Jojo Smiley
Community Veteran
Posts: 38,460
Thanks: 1,027
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Registered: 15-06-2007

Re: How is Plusnet estimated line speed calculated

In which case the Plusnet information needs clarifying.
Do you want me to raise it under feedback or will you cover it with the relevant department
Community Veteran
Posts: 38,460
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Fixes: 62
Registered: 15-06-2007

Re: How is Plusnet estimated line speed calculated

Just changed phone product and I was amused by this - a bit pessimistic isn't it
198kHz
All Star
Posts: 3,389
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Registered: 30-07-2008

Re: How is Plusnet estimated line speed calculated

It does make one wonder.
When my daughter started with PN broadband the estimate was 6000, actual 6500. A few weeks ago she added Homephone, and the estimate is now 3500, actual 7000.  Shocked
Remember you are unique - just like everyone else
Force9Original
Grafter
Posts: 352
Registered: 05-02-2010

Re: How is Plusnet estimated line speed calculated


Maybe BT's  TCP/ATM calcs are out of wack.....?Huh
One wonders if they've been fiddling around due to FTTC.....
Superuser
Superuser
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Registered: 30-07-2007

Re: How is Plusnet estimated line speed calculated

That was my thought in this thread http://community.plus.net/forum/index.php/topic,89742.0.html
My estimate ( on ADSL2+) changed from 13Mb to 3.5Mb and now back to 15Mb. The initial change coincided with FTTC going live on my cab.
My line's been pretty constant at 8Mb on 20CN.
puddy
Grafter
Posts: 1,571
Registered: 10-06-2007

Re: How is Plusnet estimated line speed calculated

BT Calculate the speed you will get by throwing 3 darts at the dart board its simple Grin
Puddy
Community Veteran
Posts: 38,460
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Registered: 15-06-2007

Re: How is Plusnet estimated line speed calculated

must be a funny dartboard then with a lot of 2's and 3's  Grin
Luzern
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Registered: 31-07-2007

Re: How is Plusnet estimated line speed calculated

No it's the thrower. First dart hits a number, number two and three go outside. The average of all three is then taken and adjusted down by a DLM factor. Surely you knew that. Crazy Grin
No one has to agree with my opinion, but in the time I have left a miracle would be nice.