Router stats query
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Router stats query
01-06-2009 2:13 PM
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I thought I was begining to understand this........
On Saturday morning I had to reboot my router as I could not connect to any sites beyond my router interface. I checked my router stats, which showed that I had had a resync 44 hours previously, and line speed was ~1400kbps (prior to this I had achieved 2176kbps). The downstream noise margin was reported to be 6.3dB, and I rebooted expecting very little improvement in speed as my target SNRM is 6dB. Immediately after rebooting, the line speed had increased to 2144kbps and the noise margin had increased to 6.8dB. Clearly there are other factors apart from line length and noise levels which impact on the line speed, can anyone enlighten me or point me in the right direction to do some research?
Re: Router stats query
01-06-2009 2:19 PM
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Re: Router stats query
01-06-2009 2:54 PM
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So if I understand correctly, the frequency bands that are used in my connection stays fixed for as long as sync is maintained. The noise margin reported by my router is an average across all of the bands. Some frequencies could experience more noise than others, but a reboot could utilise different frequencies (or more bands). This effectively changes the relationship between noise margin and achievable sync rate.
Re: Router stats query
01-06-2009 4:35 PM
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Re: Router stats query
01-06-2009 6:11 PM
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Re: Router stats query
01-06-2009 6:19 PM
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Re: Router stats query
01-06-2009 6:28 PM
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Commonest cause is the natural increase in medium-wave radio being picked up by the line - especially overhead sections - from sunset to sunrise.
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
Re: Router stats query
01-06-2009 6:39 PM
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Re: Router stats query
02-06-2009 8:36 AM
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Yes, MW propogation is usually the predominant culprit. Monitoring your line with RouterStats and looking at the patterns generally gives the best idea.
Any slight imbalance in the line will make matters worse.
Re: Router stats query
02-06-2009 11:16 AM
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What sort of imbalance do you mean?
Quote from: Anotherone Any slight imbalance in the line will make matters worse.
Re: Router stats query
02-06-2009 11:25 AM
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Re: Router stats query
03-06-2009 11:16 AM
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Quote from: 4Candles Commonest cause is the natural increase in medium-wave radio being picked up by the line - especially overhead sections - from sunset to sunrise.
So why is MW radio pick-up worse from sunset to sunrise?
I had a power failure at home yesterday, and powered router back up at 6:30pm. The best sync I could manage was 832kbps, tried twice to increase it as the noise margin was above the 6dB target, but it wouldn't sync any higher. Same lack of success this morning at 6:30am. I want my 2Mbps back. It would be great if I could reboot about now, but I'm 8 miles away, and I still haven't found any way of remotely accessing my router.
I've got an Openreach filtered faceplate, the bell wire is disconnected. There is no obvious noise on the voice line, and no REIN detected using a MW radio. I'm not sure I believe all this radio interference nonsense, it's a myth spread by BTw to divert blame away from their abysmal infrastructure. Either that or someone must have stolen half of the frequency bins. Maybe its the same person who steals the lids from the recycling boxes. Maybe I just need a holiday.
Re: Router stats query
03-06-2009 1:35 PM
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Quote from: maranello So why is MW radio pick-up worse from sunset to sunrise?
The 'D' region of the earth's atmosphere is ionised by the sun during the day, and acts like a sponge, absorbing MW frequencies. After sunset, the ionisation gradually declines, allowing the signals to reach the 'F' layer, where they are reflected back to earth. A MW receiver will therefore be receiving 'sky waves', as they're known, from the UK and abroad, as well as the normal 'ground waves' received in the day.
It's just unfortunate that MW is from about 530 - 1600kHz, while ADSL downstream is 138 - 1104kHz, so there's quite a bit of overlap. Make a note of what you can hear on MW during the day, and then compare with what it's like at night.
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
Re: Router stats query
03-06-2009 3:36 PM
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A clear, simple and easily understood explanation - thanks
Re: Router stats query
03-06-2009 6:37 PM
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