VDSL Band Status / Line stats - Is this a good FTTC line?

[g67575]

I was wondering if someone could tell me if I have a good, average, or poor / long line, based on my VDSL Band status / line statistics. Here are the stats:

I have manually increased the SNR Margin on my router to 9dBs (at default it runs a little less than 6dBs most of the time, but sometimes is set to 3dBs by BT's DLM system)

I read something interesting here, about this subject: "On longer lines then the higher U and D values are dropped as they are run at higher frequencies and higher frequencies do not travel as far along a line as lower frequencies... which then results in a lower throughput, in UK we generally have 3 up and 3 down."
From here:
https://uktechhub.com/forums/topic/...tus-on-dsl-log-status-page-u0-u1-u2-d1-d2-d3/

I also found a very useful tool to calculate what your ADSL or VDSL line *should* be able to sync at, based on the downstream attenuation of the connection. My line has a downstream attenuation of 10.4 dB and the calculator estimates a max line speed of 51.917 Mbps. Calculator here:
https://www.speedguide.net/dsl_speed_calc.php

EDIT - Apparently the VDSL checker recommends that the VDSL profile is set to '8a' (standard is 17a in the UK), so I will test this later.

I'm leaning towards it being an average - poor line, as the U3, D4 and U4 frequencies appear to be inactive. Also, the U2 and D3 frequencies are both over 30dBs.

 

[Dg834man]

Pretty good line, there should be a page in there with a bit called spectrum in it its a graph of the bit loading per tone, why do you think its an average to poor line? i had a poor vdsl line 15.5mb down and 0.7mb up only got bit loading on u0 and d1, you've made a few different posts and still not stated what the exact problem is with the line unstable/interleaved?

 

[g67575]

I used the calculator to work out the D1 and D2 bands independently, than added the results together. In theory at least, the line should be capable of ~67.9mbps on the downstream (if the line had no other problems, like noise for example).

I think it's an average line because it looks like the higher frequency D3 band has such high attenuation (43.8dB to the router), that it doesn't contribute towards the overall speed of the line (if the VDSL speed calculator is correct)

It's not a bad line really, I just wondered why the line has never been able to achieve higher sync speeds than ~50mbps (at SNR Margin of 6dB) and ~60mbps (at SNR Margin of 3dB).

The sync speed of the line is to be expected for VDSL2, considering the total distance to the cabinet is approx. 753 meters.