18-03-2008, 18:44
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#1
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Inactive
Join Date: Feb 2008
Posts: 154
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signal check
does this look ok for a 20mbs line with no line attenuators using a 255 modem?
Downstream Receive Power Level : 0.9 dBmV
Downstream SNR : 39.9 dB
I have a 3db and a 6db attenuator sitting here should i add one to the modem or leave it?
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18-03-2008, 20:09
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#2
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Inactive
Join Date: Feb 2004
Location: Teesside
Age: 47
Services: 1tb tivo, vhd, 60meg shub2 cablemodem, 1Xphoneline, Virgin mobile contract p
Posts: 1,184
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Re: signal check
Your levels are perfect. Do not add anything to your line.
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18-03-2008, 20:38
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#3
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Inactive
Join Date: Mar 2008
Location: England - Bristol
Services: VM XL BB (20meg)
Posts: 146
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Re: signal check
Signal:
(Downstream)
Frequency 339000000 Hz Locked
Signal to Noise Ratio 37 dB
Power Level 7 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
(Upstream)
Upstream Value
Channel ID 4
Frequency 29200000 Hz Ranged
Power Level 32 dBmV
Can you guys check mine too plz? 
(Motorola Surfboard 4200i Modem on 20mb BB)
Thnx~ Kitty x
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18-03-2008, 21:16
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#4
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Inactive
Join Date: Feb 2004
Location: Teesside
Age: 47
Services: 1tb tivo, vhd, 60meg shub2 cablemodem, 1Xphoneline, Virgin mobile contract p
Posts: 1,184
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Re: signal check
Downstream is a bit high, but if you have no issues then I wouldn't worry about it.
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18-03-2008, 21:47
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#5
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Inactive
Join Date: Feb 2008
Posts: 154
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Re: signal check
Thank god i took the attenuators off my speed seems a little better.
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21-03-2008, 03:07
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#6
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Inactive
Join Date: Feb 2008
Posts: 154
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Re: signal check
Hello
Just took another reading after putting in my own coax extension around the building direct from the virgin media box outside my house 20 metre extension.
modem attached to new extension.
Do the stats still look ok?
Old stats:
Downstream Receive Power Level : 0.9 dBmV
Downstream SNR : 39.9 dB
New stats:
Downstream Receive Power Level : -2.6 dBmV
Downstream SNR : 39.5 dB
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21-03-2008, 04:07
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#7
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Inactive
Join Date: Aug 2007
Location: Scotland
Age: 52
Services: 20mb, Tv, Phone
Posts: 2,849
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Re: signal check
Yup they're fine.
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21-03-2008, 10:10
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#8
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Inactive
Join Date: Jan 2008
Location: Bath
Services: 100Mb VM Broadband
Posts: 825
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Re: signal check
@MoaningMags -- could you confirm that the figures for signal levels in Robin Walker's 'Cable Modem Troubleshooting Tips' are accurate to use as a guide?
Is there a better resource to point users towards?
tia
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21-03-2008, 14:56
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#9
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Inactive
Join Date: Aug 2007
Location: Scotland
Age: 52
Services: 20mb, Tv, Phone
Posts: 2,849
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Re: signal check
I've never used the Robin Walker guide. On having a quick look it appears mostly ex-ntl, I'm clueless for the most part about that side. Acceptable ranges of power levels have changed at least twice in the last 3 years. When I started it was -4 to +4, now they tell us -12 to +12.
http://a.myby.co.uk/broadband-faq.html has loads of FAQ's and I know it's updated regularly.
HTH
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21-03-2008, 15:20
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#10
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Inactive
Join Date: Jan 2008
Location: Bath
Services: 100Mb VM Broadband
Posts: 825
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Re: signal check
Thanks.
I'd agree that Annie's Broadband FAQ is certainly an excellent resource, probably the most useful available.
But the one area that she neglects is signal level guidelines...
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21-03-2008, 16:22
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#11
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Inactive
Join Date: Aug 2007
Location: Scotland
Age: 52
Services: 20mb, Tv, Phone
Posts: 2,849
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Re: signal check
You should mail her and ask for them to be added.
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