What is your attenuation?

i assume crosstalk will only effect people on my msan and people with lines in close relation on the msan or will it be people in my local area, im struggling to find out what is considered near end and far end crosstalk.

I have another bt master socket and tempted to give sky a try...they are the latest LLU operator and are very new and i wouldnt think have many users on the msan. I can then cancel my current TT contract.

4 out of the 7 wireless networks i cna see here is TT so guess they are pritty saturated.

Edited by deleted (Sun 19-Dec-10 17:06:17)

Can you hear interference on a MW radio?
What frequencies are affected? Both DMT and Routerstats have a tone graph...

Hi

Cross talk happens mainly in the cable between you and the exchange, your pair eventually at some point joins a big cable that might have 50/100/150 or more pairs of cable all bundled up together. If you have a few pairs that are running smack against yours with ADSL you'll get crosstalk enough to be able to tell if those people have their router switched on or off! Near end and far end just depends on your perspective, but basically you get different levels of cross talk on upstream and downstream.

Changing provider will not change your route back to the exchange. The only option is a pair swap, where BT will put you on different pairs which may be suffering from less crosstalk, but also it might have more! There may be no spare capacity to do this easily and unless you have severe problems like no broadband at all due to a fault, then BT are not going to go to this trouble I wouldn't have thought. Even if you get a swap and it is better, there are no guarantees that the pairs of wire you are now neighbouring don't get broadband in the near future.

My fixed attenuation at 300KHz, the measure BT use, is around 27db, router reported attenuation is 35db and despite the slowdowns that hasn't changed.

My sync speed jumped from 13Meg up to 17Meg during a local power cut, as I have a UPS I was able to stay on line, but of course everyone around me were disconnected and my crosstalk disappeared along with other electrical noise. This is basically the negatives of using decades old technology and cabling, it's a miracle it works at all.

Regards

Phil

i struggle to find any noise on 612 as i get french radio station at that frequency.

here is a screenshot when things are okay
http://img.photobucket.com/albums/v228/Lemzip/dmt201...

and here is when it goes downhill
http://img.photobucket.com/albums/v228/Lemzip/bad.jpg

note the sync speed cheers

In reply to a post by Lemzip:

i struggle to find any noise on 612 as i get french radio station at that frequency.

here is a screenshot when things are okay
http://img.photobucket.com/albums/v228/Lemzip/dmt201...

and here is when it goes downhill
http://img.photobucket.com/albums/v228/Lemzip/bad.jpg

note the sync speed cheers

612 is unaffected according to that graph. The Gaps box - cut off in the picture - shows the affected frequencies that you should monitor.

Gap1 474kHz-479kHz (Tone110)
Gap2 548kHz-552kHz (Tone127)
Gap3 811kHz-815kHz (Tone188)
Gap4 824kHz-828kHz (Tone191)
Gap5 1048kHz-1052kHz (Tone243)
Gap6 1255kHz-1259kHz (Tone291)
Gap7 1501kHz-1505kHz (Tone348)
Gap8 1682kHz-1690kHz (Tone390-Tone391)
Gap9 1755kHz-1764kHz (Tone407-Tone408)
Gap10 1824kHz-1833kHz (Tone423-Tone424)
Gap11 1898kHz-1906kHz (Tone440-Tone441)
Gap12 1936kHz-1941kHz (Tone449)
Gap13 1971kHz-1979kHz (Tone457-Tone458)
Gap14 1997kHz-2001kHz (Tone463)
Gap15 2005kHz-2018kHz (Tone465-Tone467)

These gaps are mostly always present, they seem to be the higher end, any reason why?

My radio only goes up to 1500kHz so those higher frequencies are out of my reach however i cannot be getting so much rein from all those different freqneucies all of a sudden? I can almost remember the day things got bad and its been the same since.

Edited by deleted (Sun 19-Dec-10 18:09:03)

Looks like the noise is affecting you from Tone 243 upwards, with most damage at the top. Is there no audible MW interference at those gaps?

nothing that stands out on the radio that i can find any different to when there is no issue and i cannot tune to anothing above 1500 which is where most of the issues are but that is the higher end of the adsl2+ spectrum

Could it simply be crosstalk or would that show something different on the dmt stats?

Edited by deleted (Sun 19-Dec-10 18:43:50)

I'd imagine that cross talk would affect all frequencies, not just higher ones.

Have you set up a think broadband quality meter? just to see if that shows the problem too, if like mine it will show it as packet loss,due to the error rate, looking at the router stats graph, i can see that your snr has dropped and you say that the sync has also dropped or been capped by tt ? usually the isp will increase the target snr in a bid to increase stability, but this in a lot of circumstances only will decrease the sync speed,the line can still be as bad, mask rather than fix,(call out bt openreach) that's what a lot of isp's are guilty of, i can for an isp's view point see why ,but surely that's one of the downsides of being an isp. take the ruff with the smooth and get it fixed for the customer btw, there is an app that you can also see packetloss with called pingplotter pro, it's free to d/l and you can use free fore the trial period

Edited by tommy45 (Sun 19-Dec-10 18:52:15)