Loss of sync

Glenn · Apr 23, 2006, 07:28:57

I've started to have problems with loss of sync even when the connection is not being used, my line is on MaxDSL but the 10 day training period has past.

Thu, 2006-04-20 20:14:38 - Loss of synchronization :7
Thu, 2006-04-20 20:32:25 - LCP down.
Thu, 2006-04-20 20:32:27 - Initialize LCP.
Thu, 2006-04-20 20:32:27 - LCP is allowed to come up.
Thu, 2006-04-20 20:32:38 - Loss of synchronization :8
Thu, 2006-04-20 20:32:51 - CHAP authentication success
Fri, 2006-04-21 01:11:14 - Loss of synchronization :9
Fri, 2006-04-21 04:13:15 - LCP down.
Fri, 2006-04-21 04:13:17 - Initialize LCP.
Fri, 2006-04-21 04:13:17 - LCP is allowed to come up.
Fri, 2006-04-21 04:13:17 - Loss of synchronization :10
Fri, 2006-04-21 04:13:41 - CHAP authentication success
Fri, 2006-04-21 20:18:07 - Loss of synchronization :11
Sat, 2006-04-22 01:33:13 - Loss of synchronization :12
Sat, 2006-04-22 21:44:37 - Loss of synchronization :13
Sat, 2006-04-22 23:54:40 - Loss of synchronization :14
Sun, 2006-04-23 01:08:26 - LCP down.
Sun, 2006-04-23 01:08:28 - Initialize LCP.
Sun, 2006-04-23 01:08:28 - LCP is allowed to come up.
Sun, 2006-04-23 01:08:41 - Loss of synchronization :15
Sun, 2006-04-23 01:08:52 - CHAP authentication success
Sun, 2006-04-23 04:14:45 - Loss of synchronization :16
Sun, 2006-04-23 04:14:46 - LCP down.
Sun, 2006-04-23 04:14:48 - Initialize LCP.
Sun, 2006-04-23 04:14:48 - LCP is allowed to come up.
Sun, 2006-04-23 04:15:12 - CHAP authentication success

The current line stats are;

Connection Speed 3392 kbps 448 kbps
Line Attenuation 58 db 15.5 db
Noise Margin 6 db 19 db

I have tried switching off the router (Netgear DG834G) for 30 mins but it is still happening, I don't really want interleaving turned on as the main use is to host a Nascar 2003 'Sim race' each weekend

I have noticed the download snr drops when downloading, it can go down to approx 2db.

Jeff · Apr 23, 2006, 21:23:05

My SNR is usually no higher than 4, yet router has been up for ca 143 hours now. You may have a fault somewhere Glenn or IDNet may have to get BT to drop your sync rate manually. A drop of 800kbps will improve your SNR by 6. Sorry your experiencing probs man

Glenn · May 01, 2006, 07:43:10

I email Support on Saturday evening, since then my connection hasn't re'sync'd, I wonder what they have done, if anything?

Jeff · May 05, 2006, 22:02:07

They may have interleaved your line

Glenn · May 07, 2006, 19:29:05

It stayed sync'd for a week, just bot back and I had not internet, had to reboot the router

Jeff · May 07, 2006, 20:44:12

But ok now? Sometimes you`ll find you have to reboot your gear for no apparent reason, not such a big deal tho one would imagine

Glenn · May 11, 2006, 18:48:27

OK it's started again, lost sync 7 times in 24 hrs, I'm thinking about going back to my 1mb connection

AndyG · May 11, 2006, 20:22:04

Hi Glenn

If your router reset or lost sync for some reason at a time when the noise level was low (say between dawn and 8AM) it will have synced at a higher rate and it will have resynced downward as the noise level increased thought the day into the evening. This is all part of the ADSLMax 'rate-adaptive' process. Looking at your final connection speed in your first post I would say that 7 or 8 steps down would seem reasonable. Unfortunately, this process has to take place every time the router or the modem in the router restarts for whatever reason. The most recent episode might have been caused by the thunderstorms or some other exceptional noise.

Based on a lot of reading on this type of problem recently, I would say that it is unlikely that BT would make changes to your line because of 8 or so resyncs a day, you are normally looking at 10 or so events an hour to trigger any change.

Hope this helps a little.

Andy

Gilba · May 11, 2006, 21:38:49

I think thats the problem with people who don't have max sync and the rate adaptive system BT have in place. I had a couple of days where my sync locked with nice margins but it started to reync in the morning to a higher rate and a couple of times at night to a lower rate. I've tried increasing my margin but all that does is make me sync even higher and it starts all over agin.

Think I read on adslguide that the isp might be able to increase your target marginso you lower and maybe asking to gett your line trained could help also, but don't take my word for it.

Ordered me a new filter so I hope that might help and will sak to see if they can increase my target margin, otherwise I will have to take matters in my own hands and take an axe to the lamp post in front of my house

. grr.

Glenn · May 21, 2006, 21:11:39

I think I nee to start digging a trench in my front garden. Opps, was that phoneline??

Heres the latest resyncs for the past 5 hours, the router restarted itself yesterday morning

Sun, 2006-05-21 16:58:04 - Loss of synchronization :15
Sun, 2006-05-21 17:07:34 - Loss of synchronization :16
Sun, 2006-05-21 17:09:34 - Loss of synchronization :17
Sun, 2006-05-21 17:54:35 - Loss of synchronization :18
Sun, 2006-05-21 18:33:36 - Loss of synchronization :19
Sun, 2006-05-21 18:35:36 - Loss of synchronization :20
Sun, 2006-05-21 18:43:06 - Loss of synchronization :21
Sun, 2006-05-21 20:28:08 - Loss of synchronization :22

Miriam asked me to contact IDNet when it happens for them to check the line etc, but it's only after the fact that I check the stats. This evening I've been watching MotorsTV and Top Gear and come back to this

Glenn · Sep 17, 2006, 18:45:02

Looks like it's fixed.

Miriam contacted BT on my behalf after losing sync 56 times in 6 days. BT have reduced the connection speed by about 10%, down to 2720kbps, but since Friday around 15:30 my connection has been solid.

Thanks Miriam.