Item:Neori: I would say it is the line adjusting itself, especially if you are still within the initial 10 days of installation.
2nd day in for me. Hoping my DLM profile changes. Haven't had any CRC errors at all which is nice.
Where does one see the current profile?
I don't think you can see your profile. It's more of a self observation/monitoring of the connection. Basically "feeling" and seeing the changes. Have a read on the below VDSL performance thread in the SNAP area. It's really informative.
Main thing I'm looking at are the below;
This is the Bandplan profile that your connection is currently using. This will be either 8b (50mbit max) or 17a (70mbit max). At this point it appears that Chorus will not manually change your Bandplan profile and the only way to get to a 17a profile is if DLM determines that it is appropriate to do so. *4 According to Chorus VDSL documentation, line attenuation must be less than 2.75db (in other words; you are less than approximately 200m from the cabinet) for 17a to be activated, however attenuation figures as high as 7 have been observed prior to some lines being swapped to 17a. Note that this is different to your DLM Profile (see below).
There are 9 different DLM profiles which may be used on your line. *3 In the list below, the first item is the name of the profile, the second item is the latency introduced by Interleaving on the profile, and the third item is the INP (Impulse Noise Protection) figure.
DLM-1 1ms 0INP
DLM-2 8ms 0INP
DLM-4 8ms 1INP *9
DLM-6 8ms 2INP
DLM-3 16ms 0INP
DLM-5 16ms 1INP
DLM-7 16ms 2INP
DLM-8 16ms 4INP
There are also 2 Target Noise Margin (TNM) settings per profile: 9 & 12, but apparently the 9db TNM is only active when on the 17a profile.
Profiles are only changed one level at a time, you won't for instance, go from DLM-1 to DLM-4 in one step. So either TNM will be changed or INP and/or Interleaving latency will be changed as a result of a profile change.] - Note that while this used to be the official policy, it appears that this has recently changed and some new connections are connecting directly at DLM-1 and in some cases even 17a!
Note that the DLM profile is different from the Bandplan Profile which determines the maximum attainable sync speed for your line (see above). Sync rates are not directly managed by DLM.