If i was able to tweak the snr level via the router i would go for a lower sync during the times that this outside interference is occurring and the then again raise it for all other times,using snrm but i can't as my router don't support that, i would need a more expensive billion router to do that,
The snr used to go back up after the interference stopped each day, but for some reason although it will increase a little won't return to the set value again,

but even syncing at 8mb on adsl2+ i still see packet loss and errors, where as adsl g.dmt i don't this interference is what should be cut down not my sync speed, it's really annoying that the two companies that you pay so you can get a broadband service bt isp, are not interested isp just offer to mask the problem, in which i would end up with a service that would be unacceptable to me and bt don't give a dam about their network being degraded by this and other interference but expect payment for this broken service

Sorry when I read "set 4db" that looked as if your had tweaked from the default 6db Target!?

NB. You don't need an expensive router to tweak - a £10 eBay DG834GT or similar will do...

If my isp used dslams at the exchange that were very compatible with the broadcom chip set then i would already have one, but as my isp uses a conexant based dslam s I bought a DG834G-V5(conexant chipset) instead hence the 19mbit sync i get at 4db with a attenuation of 28-29db (isp default snr is 5db) if i used a broadcom or other router i would be looking at 14-15mbit tops(snr at 3db) also with the packet loss & errors so this would defeat the object , like i said the billion will allow the snr to changed via telnet but they are expensive,and as for e bay second hand routers,mmm not really a reliable way as you don't know that what you are buying actually is in a fully working condition or not,at least with new you get a the warranty

Edited by tommy45 (Thu 15-Jul-10 20:34:14)

Post deleted by tommy45

I was/i'm getting the 45-50%+ level of packet loss again, but found a way of reducing it,or it appears to reduce, that is to put 10 files in the rapiduploader tool and run something like 5 or 10 instances of it, maxes out the upload and the packet loss gets reduced or appears to do,???
the other thing that i have been giving some thoughts to is the fact that during a quiet line test i am able to hear a constent humming.buzzing noise similar to that of which a cooling fan would make,it has always done this, but i would also say that the interference from the shop has always been there as well . My thoughts are bt main cable or branch of to shop ect too close to mains cable in street, hence the constant noise in the background, but is this regarded as a fault by bt?

Well the problem's i have been experiencing with my line seem to of subsided recently, for the past 2 weeks i have little or no packet loss,and only a small number of serious error seconds, sometimes the Dslam will cause a re-sync and it will sync at a lower speed,at first i just left it to it's own ,after around 6days the Dslam caused a re-sync and it was around the normal sync 18 mbps+ @ the 4 db snrm and i was surprised as throughput was more or less normal,no 10-20%+ packet loss ,

observations: at a lower sync when downloading a test file in order to max out the connection, the ping increases to 200 ms+ where as with a higher sync it may only reach 200 ms is this a normal thing?

and the other thing i noticed is the crc error and erroneous seconds rate is higher with the higher sync too, but these don't seem to be having a detrimental impact on throughput,except maybe when using a single stream to connect, throughput can at times fluctuate wildly,there is also some disturbance of the downstream snr as it can cause it to drop off from the almost static 4 db by 0.5 db at times,but it is recovering when the source stops emitting its EMI, which i think is down to some machinery inside a engineering works across the road

so it's not 100% fixed but it's a hell of a lot better than it was a few months back

In reply to a post by tommy45:

... emitting its EMI, which i think is down to some machinery inside a engineering works across the road...

What makes you think it's still not the shop you've been previously mentioning?!

In reply to a post by b4dger:

In reply to a post by tommy45:

... emitting its EMI, which i think is down to some machinery inside a engineering works across the road...

What makes you think it's still not the shop you've been previously mentioning?!

Because it has occurred after the shop has closed as well as during the operating hours of the shop, there also could be multiple sources at several locations at play,but the packet loss,was the shop for sure,the engineering place is 24hrs 6 days a week or can be Dependant on work they have, i also at times can hear faint muffled noised from said property along with vibrations that are transmitted through the ground that i can hear when in bed(from machinery) the Emi or whatever affects the SNR is or seems to be random, so unable to pin it down, but it did only happen during shop hours, but it would affect it more sometimes by 1db or more for short times (while something was in use) there is also a new tanning studio opened recently,that has late night opening that is near to the shop that was responsible for the issues or some of them

Edited by tommy45 (Thu 21-Oct-10 18:36:09)

ok so some time on a new isp and some new thoughts on this.

this problem started probably about a month or so after dan at ukonline pushed my upstream snrm down to 4db and uncapped it.

on my new isp I am seeing what I consider a lot of upstream crc errors, I am getting more crc errors than on my downstream which I find bizzare.

they not going up on a regular basis, eg. on my downstream I may get a crc once every 30 seconds or so. Yet I am yet to witness the upstream count go up, it seems to jump up every now and then so eg. it can be at 100, I go away for a bit and then see its jumped up to 160, I then watch it for an hour and it doesnt budge, go away for 10 minutes and its jumped to 220, and so on.

To me its a sign I have a fault on the line that I am getting these upstream errors (864 sync 6db snrm).

I am also diagnosing my 2nd interference as silent noise, by silent noise I mean there is noise on the line that causes crc errors but the router doesnt detect it so the snrm doesnt fluctuate. I know its there when the crc error rate explodes, fixable by bumping the margin 2-3db. So still weird issues but nowhere near as severe now with the lower upstream sync.

Edited by Chrysalis (Wed 19-Jan-11 18:35:40)

Sounds like the router may be faulty.