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Standard User yarwell
(sensei) Sun 17-Feb-13 17:03:53
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58 dB attn <500k sync 6 dB SNRM


[link to this post]
 
Here's an odd one, voice works fine, attenuation about right for location but speed about 1/10 - 1/4 what it should be. Noise margin up/down at 6 dB. Test socket gives same sync n& stats. BT 21CN line.

Things to try (apart from suggesting they nag BT who are the ISP)

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Standard User TechGuyUK
(learned) Sun 17-Feb-13 17:10:32
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: yarwell] [link to this post]
 
Run up DMT using a DG834, preferably a V4 and you'll most likely see a large notch in the spectrum due to (probably local) RFI... Tune a scanner or MW radio to the frequency indicated to hear it and simply follow the noise souce to the troublesome device.

Possible causes (I have found this way) include:
PC PSU in standby mode
Low energy lamps
Old CRT Monitor
Netgear ProSafe Switch (NOT the PSU)
Various plug-top PSUs
etc...

Unless of course there's an RFI Filter in the ADSL path... That'll do the same...

Edited by TechGuyUK (Sun 17-Feb-13 17:14:51)

Standard User b4dger
(knowledge is power) Sun 17-Feb-13 17:29:34
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: yarwell] [link to this post]
 
As I think you probably know wink full router stats will help people see the state of the line!

I take it you've also checked to see that the test socket hasn't been compromised by dodgy wiring?

Edit:
Are you able to check with neighbours to see if they have similar issues?


[Has yarwell's userid been hacked? :P ]

Edited by b4dger (Sun 17-Feb-13 17:32:22)


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Standard User RobertoS
(sensei) Sun 17-Feb-13 17:30:33
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Re: 58 dB attn <500k sync 6 dB SNRM *DELETED*


[re: yarwell] [link to this post]
 
Post deleted by RobertoS
Standard User b4dger
(knowledge is power) Sun 17-Feb-13 17:36:32
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: RobertoS] [link to this post]
 
Here's an odd one, voice works fine



smile

Standard User RobertoS
(sensei) Sun 17-Feb-13 17:39:02
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: b4dger] [link to this post]
 
Bah! tongue

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 54.3/15.4Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User RobertoS
(sensei) Sun 17-Feb-13 17:41:18
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: yarwell] [link to this post]
 
Replaced the ADSL cable? And the dangly filter if one is in use?

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 54.3/15.4Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User yarwell
(sensei) Sun 17-Feb-13 17:44:39
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: b4dger] [link to this post]
 
the upstairs phone (DECT base station, filtered) went dead when I used the test socket and the stats were the same (I thought it was going to be a quick win with a filtered faceplate). Wiring is in the wall so I don't think anyone's filtered the line ahead of the master.

House opposite was offline for 3 weeks with an exchange issue (flashing DSL light) and another in the same village with a fixed speed 512k was very unstable but now its on 21CN runs fine at 4M. So I don't think there's a generic issue in the area.

Looks like I'll be going back with a router that shows the bin plots, and an AM radio.

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Standard User yarwell
(sensei) Sun 17-Feb-13 17:47:01
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: RobertoS] [link to this post]
 
Replaced the ADSL cable? And the dangly filter if one is in use?
not yet, dedicated RJ11-BT lead for next time. Not sure that fits the symptoms though as the attenuation is ok so we're not losing the signal, it's just arriving with a lot of noise.

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Standard User b4dger
(knowledge is power) Sun 17-Feb-13 17:54:42
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Re: 58 dB attn <500k sync 6 dB SNRM


[re: yarwell] [link to this post]
 
Full router stats might still help people...

I take it you've also swapped the router?

Is there any ADSL history with this line?

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