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[MikeS]

Hi

Came across a document from BT Wholesale entitled 'Broadband Max Myths and Legends' Oct 2006, which I thought a useful document.   It had this to say on rebooting routers


How many times can my line retrain per day before DLM acts?
This is a BT Wholesale configurable parameter, but currently if a line retrains more than 10 times in any single hour period DLM will take action.
It is therefore inadvisable to manually retrain a line more than 10 times in a single hour as DLM will interpret this as line instability.

[MikeS]

Whoops - forgot to put in the link to Myths and Legends

http://www.thinkbroadband.com/files/broadband-max-myths-and-legends.pdf

[mr_chris]

I didn't do anywhere near 10 in an hour before DLM kicked in on my line!!

[kitz]

>> I didn't do anywhere near 10 in an hour before DLM kicked in on my line!!

hmmm...  the night I had an electrical fault it only took a couple of resyncs at a lower figure before mine kicked in too.
It certainly wasn't 10...  and this is on a line that prior to that, continually sync'd at 8128 for about a year.

[Astral]

Deffo a myth. Mine got kicked by three short power interruptions in an hour.

[setecio]

I can't remember what I read about the effect of this ..... if that happens does it :

) permanently lower your speed
) temporarily lower and adjust back up within a few days / hours
) not actually lower your speed but lower BT's indication of what your speed should be and affect your ability to complain ?
) or something else ?

Thanks.

[roseway]

For a full explanation look at http://www.kitz.co.uk/adsl/maxdsl2.htm but briefly the DLM process controls interleaving and the target noise margin. Interleaving is very commonly applied to help to stabilise a line, and has little or no effect on the speed, but does increase the latency. Increasing the target noise margin results in a lower connection speed with increased stability.

The target noise margin is supposed to come back down again automatically if the connection is stable for a length of time, but this process doesn't appear to work very well. Both interleaving and target noise margin can be adjusted manually if your ISP is willing to push BT to do it.