Changed filter, IP profile increased, speed yet to?
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Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 9:02 AM
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That's why i suggested leaving it to see if the automatic processes do reduce it as they are supposed to.
Anyway, no harm in asking I guess.
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 9:16 AM
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Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 10:19 AM
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Quote from: alben I have just restarted my router and things have improved..........................I have done a quiet line test and there is little discernable noise, but I do know I am a fair distance from the exchange. Anyway I have never had speeds above 3000 so any increase I do get is a bonus
How far (roughly) do you believe you are from the exchange (the route the cable would go - by road usually, but if you are rural it may go via a field!)?
The barely discernable noise - can you try and describe as best you can, or confirm, it should be steady and unchanging, if you have good hearing and a good phone it really shouldn't be any more than what I perhaps may describe as a 'presence' at worst a gentle 'shhhh' not a hiss a such, and certainly no crackles that come and go - no matter how quiet, and no radio noise or crosstalk either!
The good news is that over the period already reported your SNRM seem fairly steady, and whilst your router is not misreporting the sync speed (line rate) - confirmed by the BT speedtest - HP has already pointed out it is misreporting tx power and I suspect downstream line attenuation is misreported, because if it were right you should be able to get maximum sync rate, however the reported figure is inconsistent with the upstream attenuation. Assuming you haven't got some wierd line fault, if the attenuation is near what I'm guessing, you should still be able to achieve a 6M profile with a sync speed around 7M.
Are you able to borrow another router just to confrm our suspicions? Any checking / re-syncing (which should be kept to an absolute minimum) should occur in daylight hours ideally at an optimal time.
For background information we also need to know, have you had any telephone line faults which have been fixed of late and do you have any internal extensions, are your tests being carried out at the "test" socket?
Finally, just to re-state, ideally keep the router on, do not re-boot or if you must, then no more than once a day ideally at an optimal (away from sunrise or sunset) time - when the SNRM is greatest. When swapping filters/routers etc for testing avoid more than 5 re-syncs in any hour, otherwise the exchange will assume an unstable line.
Hope that all helps, regards.
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 11:49 AM
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Statistics Downstream Upstream
Line Rate 5312 Kbps 448 Kbps
Attainable Line Rate 5920 Kbps 1140 Kbps
Noise Margin 15.1 dB 22.0 dB
Line Attenuation 26.0 dB 21.0 dB
Output Power 12.3 dBm 19.8 dBm
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 2:24 PM
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Alan
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 5:45 PM
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Statistics Downstream Upstream
Line Rate 5312 Kbps 448 Kbps
Attainable Line Rate 5920 Kbps 1140 Kbps
Noise Margin 14.2 dB 22.0 dB
Line Attenuation 26.0 dB 21.0 dB
Output Power 12.3 dBm 19.8 dBm
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 6:17 PM
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Well done with the update, keep posting the stats for a while. That info. you have provided is great. That very minor change in SNRM doesn't suggest any problem with that filter, I'd expect changes like that to occurr as a matter of course. There will be no need to do any checks from the test socket PROVIDING the stability that we can see at the moment continues, and as such will demonstrate the you have no internal wiring problems etc. It sounds like the filter you discarded in the initial post may have been the cause of your recent problem. In fact the stabilty which appears to be showing at present suggests that you have a fairly low noise line, and should be able to achieve a 6M profile (sync at around 7M).
Your distance from the exchange is pretty well what I was guessing at (which coincidently is almost identical to my line) and I'd expect your downstream attenuation to be around 40dB but I'm not so lucky with noise which is presently higher than yours! As I said earlier, if you can borrow another router just to confirm those downstream figures that would be good.
The only thing that is niggling is how your target SNRM got to 15dB in the first place, bearing in mind in reply #7 you said you've NEVER had better than 3000 throughput. You may have had a period of high local interference some while ago which has now gone, or perhaps something like lightning caused the interference. The other possibilities are local works/factories etc which may still be on holiday and noise figures may change on Monday, is there anything nearby that may fit the bill? Lets hope not.
Chris.
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 6:27 PM
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But is it worth reviewing the type of property. Is it a relatively new property - which was build by a major house builder and BT had to install new multi pared cables from the building / estate, in which case it would be new cable and maybe less likely to have issues, or is it a more established property, in a town or in a village where the cable may be fairly old.
I say this as my place is a new estate, BT put in a brand new multiple cable to the exchange and we have few problems.
In some properties in flats etc -there are more junction boxes - and let's be honest may not have been of top quality.
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 7:33 PM
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Hi mal0z, my house is 10 years old, by a major builder. I am a retired BT engineer and have changed the front plate of the master socket and reterminated the extension sockets as well as disconecting the bell wires.
Statistics Downstream Upstream
Line Rate 5312 Kbps 448 Kbps
Attainable Line Rate 5920 Kbps 1140 Kbps
Noise Margin 13.9 dB 22.0 dB
Line Attenuation 26.0 dB 21.0 dB
Output Power 12.3 dBm 19.8 dBm
Re: Changed filter, IP profile increased, speed yet to?
03-01-2009 9:37 PM
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Well Mal, we needn't worry about the wiring then eh
I shall refrain from telling granny how to suck eggs re line quality, possible dirty connections etc!!!!
Latest stats look good still Alan (except the misreported bits of course), slight drop in Noise Margin which is to be expected a this time of day, and not out of the way.
Any thoughts on past sources of interference?
Chris.
Re: Changed filter, IP profile increased, speed yet to?
04-01-2009 11:05 AM
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Line Rate 5312 Kbps 448 Kbps
Attainable Line Rate 5920 Kbps 1140 Kbps
Noise Margin 15.6 dB 22.0 dB
Line Attenuation 26.0 dB 21.0 dB
Output Power 12.3 dBm 19.8 dBm
Re: Changed filter, IP profile increased, speed yet to?
04-01-2009 4:30 PM
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Statistics Downstream Upstream
Line Rate 5312 Kbps 448 Kbps
Attainable Line Rate 5920 Kbps 1140 Kbps
Noise Margin 15.3 dB 22.0 dB
Line Attenuation 26.0 dB 21.0 dB
Output Power 12.3 dBm 19.8 dBm
Re: Changed filter, IP profile increased, speed yet to?
04-01-2009 4:40 PM
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C.
Re: Changed filter, IP profile increased, speed yet to?
04-01-2009 8:10 PM
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Statistics Downstream Upstream
Line Rate 5312 Kbps 448 Kbps
Attainable Line Rate 5920 Kbps 1140 Kbps
Noise Margin 14.2 dB 22.0 dB
Line Attenuation 26.0 dB 21.0 dB
Output Power 12.3 dBm 19.8 dBm
Re: Changed filter, IP profile increased, speed yet to?
04-01-2009 8:53 PM
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Quote from: alben Noise Margin 15.6 dB 22.0 dB
If you are going to resync that would be the sort of time to do it - high snrm.
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