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Standard User joconnell
(experienced) Sat 21-Apr-12 00:04:46
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Download speed has increased


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Speedtest.net and the lusnet speed test both indicate that my broadband download speed is just over 7Mbps, but a few days ago it was at around 6Mbps.

I'm just wondering why the speed has increased - I've had Plusnet BB service on this line for over a year now.
Standard User RobertoS
(sensei) Sat 21-Apr-12 00:34:55
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Re: Download speed has increased


[re: joconnell] [link to this post]
 
WBC DLM dropped your sync-time margin to 3dB?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Standard User joconnell
(experienced) Sat 21-Apr-12 16:22:20
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Re: Download speed has increased


[re: RobertoS] [link to this post]
 
In reply to a post by RobertoS:
WBC DLM dropped your sync-time margin to 3dB?

I don't have any previous figures to compare with, but from my router's ADSL status parameters page:
SNR Margin(Upstream) 23.6
SNR Margin(Downstream) 2.7
Line Attenuation(Upstream) 20.9
Line Attenuation(Downstream) 42.5

Are you referring to the SNR Margin (downstream)?


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Standard User RobertoS
(sensei) Sat 21-Apr-12 16:34:12
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Re: Download speed has increased


[re: joconnell] [link to this post]
 
Yes.

That can make over 1.2Mbps difference in the connection speed, (sync/bandwidth). 1Mbps sync gives probably about 800Mbps actual download.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Standard User joconnell
(experienced) Sun 22-Apr-12 10:13:37
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Re: Download speed has increased


[re: RobertoS] [link to this post]
 
This might be a dumb question, but why would the SNR have dropped?
Standard User IanBB
(learned) Sun 22-Apr-12 10:34:21
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Re: Download speed has increased


[re: joconnell] [link to this post]
 
In reply to a post by joconnell:
This might be a dumb question, but why would the SNR have dropped?


Not a dumb question, but why would it have dropped to 3db?
Standard User RobertoS
(sensei) Sun 22-Apr-12 16:11:27
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Re: Download speed has increased


[re: joconnell] [link to this post]
 
Because on WBC (21CN) connections the DLM has been modified in the last few months to reduce the default 6dB to 3dB on stable low-error lines, in the same way as it has always raised it from 6dB to 9, 12 or 15dB on ones with problems.

This has not been done on the DLM for the old IPStream/IPSC (20CN) connections. IIRC you were recently moved from 20CN to 21CN?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Standard User joconnell
(experienced) Fri 27-Apr-12 20:05:23
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Re: Download speed has increased


[re: IanBB] [link to this post]
 
It's now dropped to 2.2
Standard User RobertoS
(sensei) Sat 28-Apr-12 18:09:28
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Re: Download speed has increased


[re: joconnell] [link to this post]
 
The noise margin is set to a particular value in the system, to be applied at the time you connect. After that, it varies 24/7 because the "noise" around varies all the time.

I've got this description of what it's all about and how it works. See also the BT IP Profile and DLM pages.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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