Why is this happening?

Noticed my line keeps switching from interleaved to fast path. I force it to run on ADSL2 via my router and it randomly keeps dropping during the day.

When I check why it is dropping it keeps going from interleaved to fast path.

I've opted into interleaving on my ISP's portal.

Why is the DSLAM playing around with my line??

It's the DLM discovering that your line is stable enough to handle Fast Path.

What ISP? At a guess one delivering BTw WBC, maybe.

However, if your ISP provides a means of specifying Interleaved on their portal, they should honour it and program DLM accordingly.

I'm with Xilo on 21CN WBC.

I thought that because I am 'Opted IN' it would run all the time?

You need to speak to Xilo.

I'm also on WBC but my ISP says it's auto by DLM and they can't change it, but we don't have a user settable portal like you.

I also wanted Interleaved, but I've settled for Fast Path as the error rates are low.

On the original DLM, it was possible to specify Fast Path or Auto. Auto defaulted to Fast Path, and the DLM switched to Interleaved if it decided it was needed. It never switched back if circumstances changed.

If Fast Path was specified it didn't switch to Interleaved.

I think it's possible that there are two factors causing your problem.

First, the new DLM (as well as having instant IP Profile changes and a 3dB noise margin setting), is clearly able to revert to Fast Path.

Second, the option in your ISP's portal may be mis-labelled and means "Auto" as above.

How do you get it back to Interleaved, and is there a setting in your router you could use? Possibly via telnet?

This isn't good news.

I'm on a 3db profile at the moment, router forced to ADSL2 connecting at around 6700kbps @ 48.5db attenutation.

Recently it's been dropping during the day, which the line never does. Pretty sure it's DLM doing it.

The only way I can get it back to interleaved is by pulling the plug on the router at 8pm but then it re-syncs at 5300kbps.

It's a noisy line at night, it goes wild on ADSL2+ and without interleaving the pings rocket to over 100ms.

If Xilo can't do anything, would moving to LLU like Sky help?

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.

In reply to a post by wolvesmad:

without interleaving the pings rocket to over 100ms.

Surprised latency increases with Fast Path.

During the day the ping is 11ms. At night 100ms.

See the BQM in my sig, (on Plusnet fTTC), and also this BT thread. If your latency problem is recent, it could be part of a wider issue.