ADSL dropping sync please check my line stats

nightmare99

nightmare99

nightmare99

Soldato
Joined
19 Oct 2006
Posts
3,708
Our work ADSL connection has been dropping sync for the past three weeks (seems to drop under load) here are the line stats


SNR Down 0.1
SNR Up 6.3
Line Atn Down 30.1
Line Atn Up 16.3
Rate Down 15795 kbps
Rate Up 1147 kbps
Max Down 18112 kbps
Max Up 1156 kbps
CRC Down 0
CRC Up 65504 (I guess this is the max value as it does not go above this)

Previously the line has always synced around 12mbps but we have changed the router faceplate cables etc to try and resolve the issue. (interestingly on samknows and bt website the estimated speed now shows as 6mbps for our line where as it always used to show 12mbps)

We are 1.58km straight line from the exchange.

All BT are saying is we have some equipment effecting the line causing a high number of upstream HEC errors.

Nothing has changed our end and has been working ok for the last 2 years (it was a new line when it went in, socket is right next to the cabinet), a BT engineer came and fitted a new filtered faceplate and an RF3 filter in case of interference. It is generally ok first thing but after about an hour and a half it seems to start dropping out and gets to the point where it is down every 15 mins.

We were using a Cisco SA520W with Netgear DM111P ADSL modem on WAN1 but when the trouble started we swapped the DM111P out with a TP-Link TD-W8961ND configured in bridge mode on WAN1 of the SA520W with the same results. At the moment I am going to turn off the SA520W and let the TP-Link do the routing for the time being just to make sure its not the SA520W but to be honest the SA520W always stays up when the ADSL sync goes off.

Any ideas chaps? Help would be very much appreciated.
 
0.1 SNR on the download? If that's correct no wonder you have having major issues! Any thing under 6 then you start getting errors and drop outs. I think if you called your provider and ask them to put you on a SNR profile of 9.
 
Your snr down is near zero meaning it's highly suceptible to any sort of interference/noise. In effect your modem is having trobule being heard by the exchange. Surprised it hasnt re-synced at a lower rate with all the dropouts (you would see the snr dwn increase).
As above you could ask them to change your profile, I think this is what solved our problems (although the numerous ways the connectin/line can be effected it's hard to know, weather especially), we no longer receive our previous 8-9mbps, maxing out at 6.5mbps but its now rock steady.
 
As others have said, you've an incredibly low downstream SNR. Normally around 3db is the lowest it'll go (on some profiles). So yours being that low indicates some sort of line or config issue somewhere I'd think.

You'd benefit from being put on a 3db or 6db profile at the very least. Your connection is cutting out when the difference between the noise and the signal becomes too little. By upping that difference you will lose speed but gain stability.
 
BT? Prepare to sync at a lower speed forever.

Have you tried a phone in the test socket? I suspect you have a line fault with those stats.
 
nightmare99 said:
T be honest I'm not that fussed if the sync speed is a little lower as connection stability is what matters most to us.
Click to expand...

If you have a line issue the sync speed will keep going down, down, down as the number of errors will only increase.

Try the test socket and report any pops, crackles or buzzing as a voice fault. Once they fix this, your broadband should return to normal. Sync speed and stability :)
 
You must log in or register to reply here.
Back
Top Bottom