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Author Topic: Speed Variations  (Read 7516 times)

UncleUB

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Speed Variations
« on: November 20, 2007, 10:13:32 AM »

Hi all,when I put my telephone number into ISP,s availability checkers it says my line can support up 1mb adsl,yet when I put my next door neighbours number in it says his line can support up 3.5mb.Our lines come from the same telegraph pole.He does not have broadband so I can,t ask him what speed he is getting.Why can there be such a difference in such I small distance?
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roseway

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Re: Speed Variations
« Reply #1 on: November 20, 2007, 11:13:52 AM »

The premier line checker is of course http://www.kitz.co.uk/adsl/adslchecker.php so you should try that one if you haven't already.

The figures which you get from checkers are based on what's in the BT database, and this will quite often be inaccurate or out of date. They're only an estimate, and don't limit your actual performance in any way. If you post your present router stats (upstream/downstream attenuation, noise margin and connection speeds) as described in http://www.kitz.co.uk/adsl/frogstats.htm we could give you a fair estimate of your line's actual capability.
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  Eric

UncleUB

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Re: Speed Variations
« Reply #2 on: November 20, 2007, 01:54:01 PM »

Hi eric,just run the kitz adsl checker.It says I can get 1mb fixed and 1mb dsl max.My next door neighbour 1mb fixed 3.5mb dsl.We are both 1.85km straight line to exchange,3.54km via road.
my line stats are

1248kbps down/448kbps up  IP profile 1000kb

SNR 14.9 down/12.0 up

line att 63.0 down/31.5 up.

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roseway

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Re: Speed Variations
« Reply #3 on: November 20, 2007, 03:34:26 PM »

I see that you're already on Max, but it looks as though the DLM process has increased your target noise margin in order to stabilise your line. With the default target noise margin of 6 dB you should be able to sync at just over 2000 kbps which would increase your profile to 1500. I suspect that the speed estimate for your neighbour's line is inaccurate, unless by some oddity it follows a completely different (and shorter) route to the exchange.

With an attenuation of 63 dB you're never going to get a lot more than you are at present, and long lines are also more vulnerable to interference problems, which probably accounts for the increase in the target noise margin.

Sorry I can't be more optimistic. :)
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  Eric

kitz

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Re: Speed Variations
« Reply #4 on: November 20, 2007, 06:02:25 PM »

Agree with everything erics said.

With the default Target SNR of 6dB then you may get a tad higher speed... but it does indeed look like the DLM has had to increase it to 15dB to get stability on your line and avoid frequent disconnects.

The BT database is an estimate if records about the line are not actually held.  Yours will be based on the reality.
A 63db atten  line is pretty long and more likely equates to 4.5 - 5km from the exchange, so its possible that the line may "go all round the houses" before getting to you. :/

The only thing I could suggest is perhaps plugging the router directly into the test socket behind the master socket to eliminate any problems with internal wiring.
http://www.kitz.co.uk/adsl/troubleshooting.htm

If you get better line stat readings from the test socket, then it points to a possible problem with the internal cabling.
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UncleUB

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Re: Speed Variations
« Reply #5 on: November 21, 2007, 08:33:04 AM »

Hi,just to add that I do not have any extensions in my home just the main socket which is at the side of my computer desk.The cabling runs about 10 feet from entering my home to my phone socket.This was fitted by BT in March.As I pointed out in another thread my router manager stopped working so I was told by kitz tha t a reboot should sort it.I refrained from doing this as I was getting good stats(for my line) 1856 down/448up.snr margin 14.1down/10.0 up IP profile 1500kb.What I didn't notice was because the router manager was not working i was unable to use the broadband phone line to make free evening and weekend calls.So under pressure from 'er indoors I rebooted.The router managers fine now but my speed dropped 0.5mb.What would be the best snr margin to try a reboot to get my speed up again.At the moment it is 14.8 down/12.0 up.
Once again thanks for all your help and comments.
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roseway

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Re: Speed Variations
« Reply #6 on: November 21, 2007, 09:58:23 AM »

It looks as though your target noise margin has been set at 15 dB, and this isn't something you have any direct control over, unless you can use the DMT tool to tweak your router. You can ask your ISP to get the noise margin target manually reduced but you may find it hard to persuade them, and you risk making your connection unstable. Short of this, if you monitor your router stats frequently and see that the margin goes up and down through the day, then if it gets well over 15 dB and you reboot when it's at its high point, it should re-sync at a higher speed.
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  Eric

UncleUB

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Re: Speed Variations
« Reply #7 on: November 25, 2007, 11:24:16 AM »

Hi all,been monitoring my stats for 8 days now.My snr margin was 15.1 downstream when I rebooted and in the 8 day period has gone at its lowest 14.6 to 14.9 highest.The upstream snr was 12.0 all the time.What if anything does this tell me about my line.Do you think I would get anything higher than 1248 down/448 up at the moment if I rebooted.
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kitz

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Re: Speed Variations
« Reply #8 on: November 25, 2007, 11:40:23 AM »

>> its lowest 14.6 to 14.9 highest

If it doesnt go outside that range then the variation isnt going to be enough to get a higher speed if your target SNR is 15dB. 

Unfortunately you dont stand any chance of syncing at a higher speed until that SNR Margin goes above that figure. :/

UB remind me again which router you use - sorry I cant remember
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UncleUB

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Re: Speed Variations
« Reply #9 on: November 25, 2007, 11:42:58 AM »

Hi Kitz,its the Bt Voyager 220v ADSL voice router
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kitz

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Re: Speed Variations
« Reply #10 on: November 25, 2007, 03:27:14 PM »

>> its the Bt Voyager 220v ADSL voice router

I was hoping it was one of the routers known to work with DMT tool

Ive just been doing a bit of digging and it would appear that it has a broadcom chipset and there may (or may not )be a link with the V2100 routers.

You could always have a "dabble" to see if DMTtool v8 works and if it does use DMT to lower your target SNR a bit.

DMT tool v8 tutorial

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UncleUB

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Re: Speed Variations
« Reply #11 on: November 26, 2007, 08:46:30 AM »

Hi Kitz,just to update you,my router re-synced at 08.30,it went from 1248 to 1344 downstream and the snr went from 14.8 to 15.6.I then rebooted immediately and went from 1344 to 1536,the snr went to 14.8 down/448 up.I know this is not much but according  to your IP and bras chart I should now get 1250 kbps.


Edit, just done a bbmax speedtest which was 968down/379up.this is the same speed I was getting before.If my speed has gone from 1248 to 1536,why is the speed test showing the same.Tried to do a speedtester.bt.com but it said busy try later.
« Last Edit: November 26, 2007, 08:55:39 AM by UncleUB »
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roseway

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Re: Speed Variations
« Reply #12 on: November 26, 2007, 10:06:46 AM »

Your IP profile doesn't go up immediately. It can take up to 5 days for a small change in connection speed like this (large changes are supposed to update more quickly).
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  Eric

UncleUB

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Re: Speed Variations
« Reply #13 on: November 26, 2007, 10:13:43 AM »

I should have remembered that eric,what a plank,sorry  :-[
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kitz

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Re: Speed Variations
« Reply #14 on: November 26, 2007, 11:24:37 AM »

Good stuff - getting there.  Just got to wait for the iP profile to update :)
 
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