In reply to a post by yarwell:

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.

That's the DLM for ADSL though.

Thank you BatBoy .

Clarity is very important here, as confusion abounds. For instance, you know when the Openreach DLM sets a maximum rate for the line, is that the actual sync speed or is it 98% of the sync speed

Where does that 98% come from? I don't remember seeing it anywhere.

Dynamic Line Management (DLM) is employed in GEA-FTTC. DLM constantly manages lines to maintain a target link quality (speed and stability). It does this for as long as the product exists.
At provision, the line is put on �wide open� VDSL2 line profiles allowing the upstream and downstream line speeds to run at the upper limit of the product option selected.

If DLM intervenes it will set a profile with a maximum rate and a minimum rate, where the minimum rate is set at approximately half of the maximum rate.

I've no idea what the bands applied might be, but I assume the sync resulting would be the upper limit of it.

That's the DLM for ADSL though.

What is ? RAMBO or whatever did DLM, IP Profiles live in a large number of boxes in Derbyshire or somewhere.

http://www.kitz.co.uk/adsl/maxdsl2.htm has a diagram - is it wrong ?

Openreach docs all work in line rates, profiles are an upstream responsibility.

http://www.sinet.bt.com/498v4p3.pdf section 1.2.1 is helpful.

Line rates are "the rate at which Ethernet traffic can be transmitted on the link"

"As a result of these overheads, the actual achievable throughput in bits per second is
dependent on the reported VDSL2 rate and frame size of the data being transmitted."

"For example, if the reported downstream VDSL2 data rate is 40,000kbit/s and the IP
packet size is 1500 bytes(i.e. Ethernet frame size at End User LAN is 1514 bytes) the
maximum throughput achievable is actually 39,178kbit/s (when measured at the EU
LAN i.e. no VLAN header, but including Ethernet header)."

In reply to a post by yarwell:

That's the DLM for ADSL though.

What is ? RAMBO or whatever did DLM, IP Profiles live in a large number of boxes in Derbyshire or somewhere.

http://www.kitz.co.uk/adsl/maxdsl2.htm has a diagram - is it wrong ?

Thanks very much for that link Phil . I note the following within it. (My bold/underline)

For more information on how Max DSL works and how its different from traditional adsl - see How DSL Max works and What is MaxDSL? . In particular look at the DLM process to see how it is responsible for the bRAS and IP profile.

Are you trying to help the OP Phil, or just trying to show off your (sometimes incorrect or incomplete) knowledge?

I particularly object to your frequent links to and quotes of BT SINs in your replies to me. I am fully aware of these, as you must realise from the content of my posts, so please desist.

Edited by RobertoS (Wed 13-Feb-13 17:38:49)

words, and for some reason I can't find them on the page linked ?

It's clear from the diagram that the BRAS is not the DLM system, but merely a consequence of the sync speed which itself is a consequence of the DLM system. Note the one way arrow. BRAS profile is a dependency of DLM via the sync speed.

I've no idea why anyone would want to conflate the line management and IP profiling into one thing when they are a) different functionalities and b) different systems

The description under "Dynamic Line Management (DLM) - Ongoing Process" on http://www.kitz.co.uk/adsl/maxdsl2.htm looks solid to me.