@btcare tweeted something about problems with sites recently too

In reply to a post by wolvesmad:

I have opened a ticket with them.

Unfortunately my line is quite long and noisy at night. Without interleaving i'll probably end up with a 9db/12db SNR.

For 21CN ADSL2+ your long noisy line MSAN should be set to minimum download noise margin 6dB and interleaved path to obtain a stable connection, 3dB-noise margin is too low.

http://en.wikipedia.org/wiki/MSAN

3db is solid interleaved on ADSL2 - 30 days + uptime.

In reply to a post by wolvesmad:

3db is solid interleaved on ADSL2 - 30 days + uptime.

Huh? I thought it was randomly dropping?

EDIT: Re. Interleaving as others are saying your ISP should be able to 'pin' this.

Edited by b4dger (Tue 09-Oct-12 16:26:53)

Can you confirm if you sync on adsl2 or adsl2+, as even the mode on your line by the sounds of it could make a significant difference, are you able to force Adsl2 mode ? If it wasn't 21 cn wbc i would say try adsl g.dmt (upto 8mb) but as i don't know too much about 21cn and the available config options,
The rising ping during night time sounds like congestion local to you(exchange ) or vp

WBC should let you force g.dmt if the modem gives the option. I usually try it on the modems I have to see if it works

In reply to a post by MrSaffron:

WBC should let you force g.dmt if the modem gives the option. I usually try it on the modems I have to see if it works

In that case i would be trying the G.dmt mode , on a longish line like that, certainly nothing to loose by trying it, The op may get the best of both worlds a higher sync rate and fast path , giving a connection that is stable too

Edited by tommy45 (Tue 09-Oct-12 17:54:18)

I force ADSL2 which has been VERY stable on a 3db SNR margin - when interleaved. Unfortunately, it is a noisy line at night, always has been.

Xilo have been excellent as usual. BT have reported back asking for line stats as from what they can see, the line is in interleaved mode and at Xilo's end, i've opted in on interleaving.

It was DLM dropping the line during the day, changing the mode from interleaved to fast.

Prior to that, it had been up for 38 days at 6100kbps.

3dB margins are really only meant for lines that don't have night time noise issues.

Hence why it was a late change for BT Wholesale to squeeze more speed for the those in good areas