Ah, right, that looks fine and looks quite standard. I'll just see if I can dig up the reference for you.
Right here you go, my bold -
| Quote from: SIN498v4p3 |
2.2.1 Dynamic Line Management
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.
On the first day of operation, DLM will intervene if severe instability is detected.
Otherwise, DLM will wait until the day after provision before deciding if it must
intervene, provided that the line has been trained up for at least 15 minutes during the
preceding day.
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. The
purpose of the minimum rate is to ensure that the line does not train at a rate which is
significantly below the level the line should be able to achieve. If this happened, then
the line is likely to remain at a very low rate until a re-train is forced by the user by
powering off the modem.
Note : It is the DLM system that sets the line profile, and this should not be interfered
with by CPs/users setting rates, SNR margins etc. at the modem.
Note : The upstream throughput is also constrained on the DSLAM to the upstream
rate requested in the order, i.e. 2Mbit/s, 10Mbit/s or 20Mbit/s, so even if the VDSL2
upstream line speed is higher, the upstream throughput is constrained to the level
ordered for the product. |
I can see that there may be an element of confusion between the established Profile (band) and Banded speeds that occur on 21CN ADSL (when there has been a fault condition and if it were not for the Banding the speed would be higher).
Certainly in your case you aren't achieving the higher speed of the Profile your are on, so not restricted. It should be noted that if your current sync speed is actually lower than your line may be capable of, if the DLM sees a stable low enough error connection, it will raise the speed. It does seem better at doing this than 21CN ADSL DLM, judging by reports that other users have made.
