One thing which might improve it slightly - keep the twists in the pairs for as long as possible. Even a few inches of untwisted wires is enough to pick up noise. You will also note that each pair, is twisted at a different rate, that is to further minimise cross talk between them and I would twist together the brown and green pairs at both ends - in can sometimes make a difference.

As its the vdsl filter (if memory serves me right) there will be two connector less blocks

The A/B which is unfiltered, hence why removing faceplate improves things
A 2/3/5 one which is where the orange wires should go 2 and 5

In reply to a post by MrSaffron:

The A/B which is unfiltered, hence why removing faceplate improves things
A 2/3/5 one which is where the orange wires should go 2 and 5

Thanks, I'll try that shortly. Does it matter which orange wire goes to which connector? If it does I have a 50:50 chance...

With the extension line connected to the A/B block I had a clear line. No noise on the quiet line test. If it was unfiltered shouldn't I have been hearing broadband noise?

As the broadband is well outside the frequencies you can hear likely to have not heard anything

Also if you had a phone plugged in at the extension without a microfilter that would increase the problems with the connection

Which orange of the pair does not matter

In reply to a post by MrSaffron:

As the broadband is well outside the frequencies you can hear likely to have not heard anything

Slightly confused now!

I thought I had bought a Mk4 faceplate in order to do away with additional filters. I thought I needed to connect the extension to the Mk4 faceplate and then that would be suitable for a voice handset.

But actually the connectors on the Mk4 are for a data extension?

And the connectors on the 5C 'baseplate' for extension wiring are filtered for voice?

In otherwords I already had a filtered Openreach box, I was just buying a more convenient two port version, one for voice and one for DSL..

The aim is to have the FritzBox modem/router connect to the DSL and, to use it for DECT, its phone line to the phone point. Both on the Mk5 faceplate. Then there's a phone extension point in another room which will not have a handset attached but I do want for possible future use.

Currently I have

Receive Direction Send Direction
Attainable throughput kbit/s 50254 15338
Current throughput kbit/s 39998 9997

If I can get a 15Mb upload by moving to the 'faster' fibre package it would be worthwhiile for me. Lets see what happens when I reconnect the Mk4 faceplate - wired as advised!

I have retrieved the 5C I have

The telephone extension if you want it filtered should be connected be connected to 2 and 5 on the Master Socket 5C piece of plastic, i.e. the part that is screwed to the wall box.

The removable VDSL2 faceplate and its A/B connector is where you connect any data extensions.

So you connected the extension to the wrong connector, presume there was no instructions.

The 2/3/5 connector is filtered by the faceplate and when the faceplate is removed is disabled.

In reply to a post by MrSaffron:

presume there was no instructions.

Perfectly correct.

OK wired up properly with extension line working and Mk4 faceplate back on.

A drop in attainable

Attainable throughput kbit/s 48394 14880
Current throughput kbit/s 39998 9997

Maybe later I'll disconnect the extension completely then we'll know if its that wiring or the Mk4 faceplate.

A drop but the upload which you were wanting to chase is holding up, and with maximum sync currently there is scope to upgrade.

NOTE: Upgrading might see the line vary speeds more i.e. be less stable as you are likely to be utilising more marginal bits of the signal. So I'd advise once you have finally finished playing to wait a few weeks and confirm things are stable.