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Author Topic: BT ADSL2?  (Read 33412 times)

Ash888

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Re: BT ADSL2?
« Reply #75 on: June 15, 2009, 08:24:02 AM »

online gaming has been fine since then so im glad that is out of the way.

but im still getting heavy packet loss at around the same time on most days.
i have been lowering the snr from 6db to find a optimal point so far i have gone down to 5.1. but when i get heavy packet loss it seems to push snr up towards the 6db mark.

check out my f8lure graphs. i wish i had known about this before i would have tested it when i was with bt to see if its always been like this.

im not 100% but it may be down to a small leak from an upstairs apartment in my flat. im on the ground floor, and i can some times hear water drops in the wall. this is the same wall with the extension im using for my router. im just wandering if thats having an effect on noise or even directly on the cable itself if it is anywhere near water.

i could open up the socket and have a look behind but iv been lazy.

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Ash888

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Re: BT ADSL2?
« Reply #76 on: June 15, 2009, 03:21:04 PM »

also...is it alright to have a difference in up and down snr.
usually the difference can be about 1db, but most of the time it is the same.

right now down snr is 4.4 and up is at 7.
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jeffbb

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Re: BT ADSL2?
« Reply #77 on: June 15, 2009, 05:59:43 PM »

HI

quote  but when i get heavy packet loss it seems to push snr up towards the 6db mark.

when SNR goes up it shows less noise on line . normally a good thing . The only time increased SNR is bad is when it is forced (target SNR increase )

quote . also...is it alright to have a difference in up and down snr.


More often than not the up stream is different to the down stream usually upstream is higher (edit : because of the lower frequencies used ). Remember the SNR displayed is the SNR margin (elbow room)
http://www.kitz.co.uk/adsl/linestats.htm  good explanations on this link .

Regards Jeff
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Ash888

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Re: BT ADSL2?
« Reply #78 on: June 16, 2009, 07:41:00 AM »

thanks mate.

well its happened again. around 7am. im trying to think what it could be like any interference etc. i get back from the gym just after 7. so nothing has been in use and my computers are off. just router on. i wander if someone jumped on my wireless???



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kitz

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Re: BT ADSL2?
« Reply #79 on: June 19, 2009, 08:25:33 PM »

If the packet loss was due to noise, youd expect it to be worse when the SNR Margin was lower.

SNR Margin fluctuates all the time.. its usually worse in the evenings.
If your packet loss increased when the SNRM went up.. then its most likely to be a co-incidence and not related.
Low SNR can cause packet loss..  not the other way round.

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