Line speed

[#1]

These are my current stats, I get 48ish down and 8 up

[#2]

Looking at that, I wouldn't anticipate any further lowering of your SNR or improvement in your download speeds due to DLM training, unless there is anything you can do to reduce the noticeable interference on the inbound VDSL signals.

Try unscrewing your BT Master socket faceplate, and connecting your router to the hidden "TEST" socket, and see whether your line stats are any better (preferably using the shortest DSL cable you have).

To connect your router's DSL socket to the TEST socket, you'll either need -

- an RJ11 to BT431 (phone plug) cable (possibly from an unused phone handset/base) -

- or use an inline dangly DSL filter to act as an adaptor for your RJ11 to RJ11 cable -

[#3]

Thanks for the tips but this is already plugged directly into the test socket to remove any internal wiring, I've bought a twisted pair rj11 cable and this microfilter https://www.run-it-direct.co.uk/adsl-vdsl-filters/vdsl-microfilter/ which was the best VDSL one I could find! I would say that my attenuation stats were similar on my old line and that did manage to get down to 3 noise margin and sync at 60, it stayed like that for a couple of months before the line started failing so I was hopeful this could get to 60 as well. Any more tips I can try I would definitely give a go!

[#4]

I do have an ADSLnation xf-1e microfilter that I know used to be the best for ADSL connections but I've not tried it with VDSL, it might be worth me giving that a go but I don't want to upset DLM by disconnecting etc

[#5]

As you are already plugged in to the TEST socket, don't bother with changing the filters over.

The use of the filter in your case, is just to act as a RJ11 to BT431 plug converter, the 'filter' part is irrelevant.

Inside the filter, the BT plug and the DSL (MODEM) socket are directly connected together, with the noise filter only on the PHONE socket.

See this simplified circuit -

On my setup, I don't use any filter, I have a 50cm RJ11 to BT431 modem cable made with twisted CAT5e.

.

[#6]

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@JHarland wrote:

Any more tips I can try I would definitely give a go!

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The next thing to look for, is whether there is anything electrical adjacent to the internal route of your landline phone cable from the master socket, to where the cable goes outside.

In this topic, we were able to significantly improve someone's modem stats, just by rearranging nearby power supplies and other cables.

Currently your line stats are -

                   Upload / Download
  Line attenuation:  11.4 / 18.7
Signal attenuation:  11.4 / 25.4

The problem you have is that the download signal attenuation is too high.

You somehow need to find and reduce the line interference so that 25.4 is closer to 19 or 20.

As you are already in the TEST socket to eliminate the faceplate and any extension wiring,  then eliminating nearby electrical RFI noise (if possible) from the length of the landline cable and within close proximity of  the router,  is the next step.

.

[#7]

I had actually already swapped out the microfilter but did actually get better stats, my router is now syncing at 55 and I'm getting 50 down in real world tests.
I have ordered a cat6a pure copper, shielded, twisted pair rj11 cable so hopefully that might bring that signal attenuation down

[#8]

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@JHarland wrote:
I have ordered a cat6a pure copper, shielded, twisted pair rj11 cable so hopefully that might bring that signal attenuation down

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I agree that you need to keep your DSL lead as far away from electrical interference sources as possible but I doubt that a short screened cable, with an unterminated screen, will have much effect when you consider that it's hung on the end of many hundreds of meters of unscreened cable back to the FTTC cabinet.

My suggestion would be to stop tinkering with the connection for a week or so and give the DLM a chance to do its thing.

[#9]

Any advantage of using ferrite chokes on power cables?

[#10]

Personally, looking at your sync speed (~50 MB/S) and your 'real world' speed, I don't think spending any money would get you anywhere. Do you honestly think you would notice any difference in performance if you got a couple of extra mb/s - I don't?