Target SNR margin
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Target SNR margin
02-05-2009 11:51 AM
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I have checked the obvious: wiring, phone, microfilters, router etc.
Re: Target SNR margin
02-05-2009 4:06 PM
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Re: Target SNR margin
02-05-2009 4:23 PM
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Having had a quick read through some of your previous posts, I think the only way to get to cause of this is by some serious monitoring.
You will need to use which ever of your better routers will work with RouterStats - http://www.vwlowen.co.uk/internet/files.htm and possibly, but not essential, DMT - follow the links from this kitz page - http://www.kitz.co.uk/routers/ - to find out which version you need.
RouterStats is best for longer unattended monitoring. I suggest setting the sample rate to 8 seconds, 900 points per page (2 hrs). You need to set it to save the DS Noise Marhin and sync graphs always. If you'd like guidance on settings please ask.
Re: Target SNR margin
02-05-2009 5:16 PM
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My 'better' router is a zyxel P660H and this works with Routerstats lite (not the full one AFAIK). I have been monitoring the SNR margin all day. I'm not sure how to get the error rates. This info is not available via the web interface. I don't believe either of my routers are supported by DMT tool.
The SNR margin fluctuates quite a bit in the range of 10-14dB. It dropped to 7 once but recovered quickly. I am not aware of anything internal that may have caused this.
Tomorrow I propose to swap routers and monitor it again, this time with the router right next to my master socket and see what happens. I have to move a lot of things about for this so I have not done this before.
I have not noticed a downwards trend in SNR yet this evening. Maybe this would happen later? It's 5:15pm now.
Re: Target SNR margin
02-05-2009 8:20 PM
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Re: Target SNR margin
02-05-2009 10:50 PM
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Re: Target SNR margin
03-05-2009 8:14 AM
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You can use a utility called ZyxMon (you can find it via Google - its a freebee) to get the error details. Also, you can use telnet to get into the router's CLI and extract the details from there (not as simple as ZyxMon tho). Oddly enough, and I don't know why, the P-660-HW I have goes to SNRM 6.0 straight away, regardless of the in-use target SNRM. It gives a reasonable sync rate - not the best of the bunch, especially as it is at SNRM 6.0- but does give lowish error rates.
Re: Target SNR margin
03-05-2009 11:58 AM
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Re: Target SNR margin
03-05-2009 4:04 PM
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take it you on the test socket behind the face plate on the master and not just plugged in to the master socket face plate?
Re: Target SNR margin
03-05-2009 4:25 PM
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Re: Target SNR margin
03-05-2009 5:47 PM
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Re: Target SNR margin
03-05-2009 7:09 PM
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Re: Target SNR margin
03-05-2009 7:58 PM
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Re: Target SNR margin
04-05-2009 10:49 AM
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Re: Target SNR margin
05-05-2009 4:55 PM
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