LOW SNR IS IT OK ???

I have had a LOT of issue with my BT broadband and it has finally been fixed (3 months after it was reported) they have reset my profile and it had been doing it's stability thing until a few days ado when it re-sync'd at the details below but SNR seems very low and has been as low as 3.9 has anyone else had this and how will it affect my stability???
I swap to BE in a couple of weeks so will this change the general performance of the line / speed, currently on adsl max going to adsl2+ what should I expect ???

ADSL Link Downstream Upstream
Connection Speed 5952 kbps 448 kbps
Line Attenuation 34.0 db 18.0 db
Noise Margin 4.4 db 22.0 db

All reply's welcome Thanks

I've put your figures (5952, 34, 4.4) into http://www2.farina1.com/ADSL/default.aspx and it gives an ADSL2+ estimate of 12Mbps after overheads.

Generally the target SNR margin is set to 6dB when you resync. Thereafter the reading will change as circumstances change (more noise, lower reading).

your downstream sync speed is modest for the attenuation.

Have you done all the usual things like try it in the test socket behind the master faceplate ?

Thanks for the reply...

I am ,or so BT say 3.5k from the exchange, I have had 3 months of 133Kbps because some idiot at BT (whilst doing the 21cn upgrade) messed up all the jumpering and put me on the wrong route, this is the best sync speed I have had since the line was installed aprox 6 months ago, Although I did get 6.8Mbps for a couple of days earl on, I have tried the test socket and BT have even put a new box on the wall so I think this is the best i'm going to get

Thanks for that, it's a great tool

I took your advice yarwell and put the router in the test socket, I lost a bit of the sync speed but the SNR was more stable, at the same time I noticed that all the wiring in the box was a mess and their was about 3 inches spare from the extension I have upstairs, (wired by the previous occupant, I must say), anyhow I trimmed off the 3 inches wired it all back up and hey presto, I now have a much more stable 6.7db SNR compaired to the 4.4db I was getting before, my sync speed is the same but I can live with that and my line attenuation has gone from 34db to 33db as shown below,
I just wanted to say thanks

ADSL Link Downstream Upstream
Connection Speed 5920 kbps 448 kbps
Line Attenuation 33.0 db 18.0 db
Noise Margin 6.7 db 22.0 db

If the ring wire is attached it might be worth your while to remove it.

See http://www.dslzoneuk.net/socket.php?type=html

You probably should still be syncing faster. Do you have a long overhead section (by that I mean a hundred yards plus on poles). My own attenuation on ADSLMax was 35dB and I got maximum sync (well 8096 with interleave on). On ADSL2+ I get a maximum of 13Mbps.

Not really, am 15m from the pole plus about 5m as it comes into the front room, the box at the end of the road is only about 45 - 55 m away, I have removed the bell wire as one of the guys recommended and am now connected at 6.016Mbps, a friend down the road lives about the same distance away and he only gets 4.8Mbps. Since removing the bell wire the SNR has improved and at the same time I also removed 2 extensions that don't go anywhere and discovered that the line coming in went into an RF suppressor box but when I opened the box their was nothing in their, the wires were just joined together, so have removed that and hooked back up to the master socket.
Anything else I can do ??

Not much that I can think of.

When you connect into the test socket removing the faceplate automatically removes all the hard wired extensions and the sync rate you see there is the best you'll see anywhere in the house at that time.

The router will always try to sync at whatever target margin has been set - this is usually 6dB and that seems to be what yours is set at.

Noise levels usually increase in the evenings - this is down to more use of electrical kit in the surrounding area which can generate impulse noise at it switches on and off and also the biggest culprit as darkness falls - MW (AM) radio signals which come in much stronger. That noise increase is seen as a reduction in noise margin - it can get bad enough that the router is forced to resync. If that happens regularly then the DLM software may set a higher target noise margin or turn on interleaving.

One other possible reason that your sync appears low for the attenuation and that is that your router is reporting the attenuation lower than the norm as there is some variation between routers - you'll be getting a different router from Be anyway (which will certainly report the attenuation differently because you'll be on ADSL2+ and syncing higher so it will be reported higher - 4dB higher is common).

The final thought is a cheap filter - if you still have an RJ11 to BTphone adaptor left over from dialup days it is worth seeing what sync you get in the test socket with no filter at all - the chances are it will be the same as now but worth a check if you can.