I had power cut last month with 4 times in a space hour but DLM haven't been hit. Don't understand really as I only swap over modem three times but DLM was hit the next morning.

God damn u BT.

Question is what does INP 3.00 (1147) mean?

Plusnet told me ppp session disconnected to different gateway cause DLM. I told them that's rubbish, DLM won't be affect if the openreach modem dsl light stay active at all times. They say no, both router and modem must stay on at all times no disconnection.

Edited by adslmax (Fri 26-Sep-14 02:19:29)

I was hit by DLM for re-syncing my modem 3 times in less than 1 hour.
(Trying to set the configuration to match someone else's which did not work)

It took 14 days for the line to recover and be restored.

My line is 80/20 with little noise but increasing crosstalk due to new cab with growing number of users.

The 10 resysnc rule of thumb is not true from my experience.

I think BT will be more than likely to change the rules for DLM as the network grows.
Also maybe DLM is adaptive as well and it changes its rules over time.

I used to get interleaving applied every couple of months. It took exactly 14 days for it to be removed. Thankfully since the modem firmware updates my line is rock steady.

In reply to a post by adslmax:

They say no, both router and modem must stay on at all times no disconnection.

That seems unlikely- the DLM should only be interested in whether or not you have sync with an acceptable error rate, not whether you're logged in.

Last night my connection was drop (ppp reconnection) because of plusnet current line speed changed from 77.4 Mb to 70.6 Mb. (Hope it doesn't affect DLM)

In reply to a post by adslmax:

Question is what does INP 3.00 (1147) mean?

INP stands for "Impulse Noise Protection", and the "3.0" value means 3 symbols. In this sense, a symbol means a number of bits; if I understand it correctly, the "bit loading" for a particular tone is the number of bits carried by each symbol.

What does *that* mean?

The INP value is set by DLM, and is the primary means by which DLM asks for protection against noise to be turned on for your line. This is what we mean by DLM intervention.

When INP is non-zero (in this case 3), DLM is asking the modem to synchronise with INP methods in place, such that any noise burst that destroys up to 3 symbols of data can be recovered. The modem responds by configuring FEC and interleaving in such a way as to make this happen.

If DLM set a higher INP value, it would be asking for additional protection from longer bursts of noise.

I don't know what the "(1147)" means (where did you get it from?) but I'd take a guess that it is a value for the interleaving depth chosen by the modem, as part of its configuration of FEC and interleaving.

DLM making worse on my line now. Not happy at all.

http://www.thinkbroadband.com/speedtest/results.html...

http://www.speedtest.net/my-result/3789458215

I don't think that's DLM, it looks like exchange or backhaul congestion. BT can take a long time to sort that out!

Max that is what I get all the time... Started at full whack for 4 - 5 weeks solid,and now down to 53.....

BT told me when I phoned them up that they couldn't reset the profile.