So, could one of the above please say in one sentence what I should do. (Use disconnect & reboot the router once a day, or wait for the PPPoE?)

Use disconnect & reconnect the router once a day.

Second sentence, sorry: There is no need to wait between disconnect and reconnect; there is evidence that where the MODEM is disconnected/reconnected it is best to wait between the two.

"Use disconnect & reconnect the router once a day."

So using the above will not affect DLM?

Which DLM, and affect what setting within it?

I'm beginning to wonder if you will accept any answer that isn't the one already in your head

DLM is only concerned with the Line and the VDSL connection over it, it has no knowledge of the PPP or whatever else may be happening at a higher level. It works on low level errors, stability and sync speeds.

So if you disconnect the router, which is only concerned with higher level stuff, and leave the modem alone, there is nothing for DLM to see or react to.

The upstream signalling of the sync speed to the BRAS and ISP is a good practice thing for traffic management and pipe dimension, it's not to do with the line. See the standards for BRAS functionality if interested.

Umm Phil - I think part of his confusion may be that he hasn't understood that there are two DLMs in play here. You only describe what the Openreach one does. So that could add to his confusion.

Edited by RobertoS (Wed 13-Feb-13 12:13:45)

Okay. Well part of my confusion is 34 replies to my original question, which I thought was straight forward! (Plus another 27 replies on my cross thread at http://forums.thinkbroadband.com/plusnet/f/4209010-p...

I won't comment any further - thanks for the explanations.

In reply to a post by shalom2005:

Okay. Well part of my confusion is 34 replies to my original question, which I thought was straight forward!

LOL

Does a re-synch always result in a lower IP Profile?

No.

is the ip profile system a DLM?

It has no intelligence, algorithms etc. It just is a throughput limit that is set when ppp is established based on the sync speed of the line.

there's only one line, so how are there two DLMs ?

The IP Profile is actually set by the WBC DLM, Bill.

That's a BRAS function, shirley ? as per TR59. I'm not sure calling it "DLM" is helpful.

The Openreach DLM sends out a notification on establishment of a PPP session, not on synchronisation.

The DSLAM inserts line rate data into the PPPoE or DHCP negotiations, for the BRAS or CP to use for downstream traffic shaping, agreed.

Openreach DLM responds to errors and retrains so will be using a different mechanism to keep informed, direct comms with the DSLAM I guess.