Drop in Synch

[bertie]

Hi,
A bit of advice please.

I have a filtered faceplate, and every 3 months or so I noticed noise on the line when using the telephone, and then find that my synch rate had dropped.

After re-booting my synch rate would go back up to 8128. Then it started happening more frequently and so I bought an ADSL Nation filtered plate and everything was great. No more noisy line for about a week.

Now my synch rate has stayed at 6976 and my noise margin has risen to upto 11.8 from around 8.

My router is a Netgear DG834GT. I have used the 17070 numberand can hear the noise but when I do an online test at BT.com they say there is no fault.

Later today I will purchase new lengths of wiring/plugs and a new double socket so my sky and telephone lines will both have new wiring.

I may be thick but I thought that having a filtered faceplate would have stopped any interference from telephone conections and vice versa.

Apart from what I have done and intend to do is there something I may have missed?

Cheers

Bertie/Mervyn

[Polo]

I've had a similar problem before. The noise would appear randomly and cause my ADSL to resync. It would connect at some really low speed with a target SNRM of 12. Then the noise would go and the SNRM would shoot up to something like 18-20ish dB. If i unplugged the router the noise would go away on the telephone.

Doesn't sound like yours is quite as bad as mine was. I was dropping from a profile of 5000 to 750. I'm pretty sure it's gonna be a line problem but try another modem just to be sure and wait for some more suggestions. I could be wrong :p

[bertie]

These are my current stats.


System Up Time 05:31:58
Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
WAN PPPoA 18278 27148 0 114 1446 05:31:30
LAN 10M/100M 27927 19963 0 1492 145 05:31:56
WLAN 11M/54M 855 0 0 9 0 05:31:54


ADSL Link Downstream Upstream
Connection Speed 6976 kbps 448 kbps
Line Attenuation 31.0 db 18.0 db
Noise Margin 11.4 db 24.0 db

As I said previously my normal synch rate has been 8128 and noise margin is normally around 8db now it averages about 11.8db I just cannot figure out what is going on. Bt online line checker states that there is not a line fault.


Cheers

Bertie

[bertie]

Well I have now changed the double plug and the lead from sky to the the plug and a new extention lead from the phone to the master socket.

Still a noisy line and BT still maintain that the line is clear.

Am now completely stumped, although I have a couple of other things to try then I suppose I will have to put up with it unless anyone has any suggestions?


Cheers

Mervyn

[10110101]

Make sure there's no electrical equipment between the master and your router. Don't use cheap telephone extension cables, buy shielded RJ45 cable. I have a 16m one.

Failing that get your line capped to 4m if possible but I think BT might only offer 1 or 2mb fixed lines.

[bertie]

Hi thanks for your input.

My filtered faceplate is directly linked by a top quality data cable.

BT via the fault checking on their website seem now to accept some sort of problem as they are checking into it further.

Until now the result has always come back as no fault. I will wait for the results of these further checks, then I will disconnect my hard wired extension if no problem is found and see if that makes a difference.

The problem with BT of course is that if they make an appointment for a visit they could quite easily say that it is my internal equipment and charge me nearly £200 for the privelage.

Just have to wait and see.



Thanks

Bertie

[dlloyd]

I had a very similar problem to this. Things would be okay until suddenly I would start to get a crackly line and the sync rate bobbing all over the place (right down to 120 or whatever the lowest rate is). I tried new filters, new cables and a new router, all to no success.

Sometimes I would disconnect my internal wiring from the master socket (an old style one, so without the test socket) and all would be well again. Other times it would make no difference at all. In the end I bought a new master socket of eBay and bypassed my BT one completely (all very naughty, I know!). Since then it has been perfectly fine - aside from the fact that BT refuse to reset my SNR target, so I am stuck on a 12 dB target at 7500-odd sync rate.

So, maybe you have a bad master socket that is throwing up an intermittent error? This was the conclusion that I came to, and I never bothered getting a BT engineer around in case it was a good day when they came and that they would not be able to find a fault!

[ARRANPILOT]

Really interesting thread - much the same as my experience.

I notice the Netgear router - I too have a Netgear 834, and I too have installed Cat 6 (!!) wiring and am beginning to wonder if ther is a vulnerability here. I am monitoring with Routerstats, and my Dect phone, and one of my older PCs drops the SNR to negative at times.

Anyone else with a Netgear like to comment?

Thx,

Arranpilot

[Dae]

Anyone else with a Netgear like to comment?

I also have an 834GT, ADSLnation faceplate, cat5e adsl cable to router and a DECT phone ...

And have no noise on the line and haven't lost sync once since January ..
and its loss in December was due to a major fault with the multiplexer at the exchange.

If you have a lot of noise on your line, often lose sync and have a very erratic SNR Margin then you most likely have some form of line fault that needs investigation.

If you have ruled out internal wiring (i.e extensions) using the 'test' socket, tried a new phone (if necessary), tried new adsl filters (including swapping out the filtered faceplate for a known working filter) and have tried a new router
(in case it has failed for some reason) then your only course of action is to report
a voice fault (if the line noise is the major issue) or book an SFI visit via the ISP (if it is a broadband issue).

If you have done the above then it is highly unlikely that you would be charged the potential £188 inc VAT for the callout as it must be a fault external to the property.