Losing sync all the time

Rik · Mar 25, 2010, 16:14:02

What's your target noise margin?

qweezy · Mar 25, 2010, 16:17:26

In the 2700 stats I have 16.4db down and 6.1db up for noise margin.

Rik · Mar 25, 2010, 16:21:20

That suggests your target NM has probably been pushed out to 15db by the DLM, due to either instability or errors. If the 2700 holds the sync, after 14 days, the margin should reduce to 12db, then 9 then 6 - depending on when the line becomes unstable. Each 3db drop is worth 5-700k of sync speed to you.

Glenn · Mar 25, 2010, 16:24:22

Interestingly, Brian told me a while back it would happen, I have lost 500kbs after my router resync'd, the attenuation rose from 58.9 to 59.2.

qweezy · Mar 25, 2010, 16:28:52

Thanks for all the help guys!

Lets hope it stays stable.

Rik · Mar 25, 2010, 16:30:16

Let us know how you get on.

qweezy · Mar 26, 2010, 18:18:46

All was going well, stable for just over 24 hours.

However, I lost sync again in last few minutes.

Shame

I was getting better speeds too.

qweezy · Mar 26, 2010, 18:23:18

And lost it again.....

Held sync for less than 5 minutes.

Steve · Mar 26, 2010, 18:26:27

There's some electrical 'noise' from somewhere.

Rik · Mar 26, 2010, 18:29:41

Have you done a quiet line test, qweezy, dial 17070, select option 2 and listen. You should hear just a quiet hum or hiss.

qweezy · Mar 26, 2010, 18:33:41

Hello,

Just did the quiet line test and its clear. No crackles or pops.

it must be interference from somewhere/something.

Rik · Mar 26, 2010, 18:39:28

It must. If you've done everything to eliminate your own setup, then all you can do is ask IDNet to get a BT engineer out to you, but be aware that may attract a £170 charge.

qweezy · Mar 26, 2010, 21:57:10

I want to avoid a BT Engineer at all costs. I have had one out before a few years ago and it solved nothing at all.

Just one last check, I plugged the router into the test socket and the attenuation values/Noise margins are the same.

I have been going around my house looking a bit crazy turning appliances on and off to see if it boots off the ADSL, but I haven't found anything.

The only possibility I can see is an electrical issue with the router. I have it plugged into a block in which a number of other electrical items run off, is there a possibility that the turning on/off of these items could disrupt the router?

I would be interested to know if the DLM still sees router DC's and not connectivity failures since I have started using the 2Wire.

Oh, and is it normal for the DSL Sync light to flash at different rates before sync? This happened with my Belkin and the 2Wire. The DSL light would flash very quickly, then slowly then quickly again until it synced and went solid.

Thanks.

Rik · Mar 27, 2010, 10:10:49

The test socket may not change the stats, qweezy, but you need to keep the router there for at least 24 hours, as it will indicate if there's an issue with your internal wiring. The power supplies with many routers, and definitely the 2700, are not of the highest quality, so I would recommend having it on a separate, surge-protected, socket. Even better is to use a small uninterruptible power supply.

You'd have to ask support about what the system is seeing on resyncs as we can't reach them today for routine issues.

The DSL sync light does exactly what you describe as it negotiates the sync. It seems to take longer on ADSL2+ than Max.