How to send data signal from master socket to extension socket?

2 Nov 2018
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United Kingdom

Apologies if a lot of this is pretty obvious, but my knowledge is fairly limited.

We just had a Master Socket 5c MK 4 fitted (downstairs) and unknown to us at the time it has filtered out the data signal to the extension socket (upstairs), where the router was previously connected to and we would like to be connected again.

On the master socket an orange and white wire plug into the A and B connections and a green and black wire go into the 2 and 5 connections. I believe this green and black wire brings the phone signal to the extension socket. Note that all the wires mentioned come through the same cable (there is unconnected red, blue, grey and brown wire).

I also read that the A and B connection on the back of the faceplate is a data connection. As shown at the bottom of this pdf:

We don't want a phone signal in the extension socket, just a data signal for the broadband. Is it possible to swap the green and black wires from 2 and 5 to the A and B connections on the back of the faceplate and send data to the extension socket instead?
(I believe this is what this website is talking about doing? htps://

If it is applicable, the upstairs extension socket has older wiring, which I believe is as listed below:

Pin 2 is A (blue)
Pin 5 is B (orange)

Pin 3 is Bell wire (green)
Pin 4 is Earth wire (brown)

If moving the green and black wires in the master socket to the data connection on the back of the faceplate will carry the data signal to the extension will the extension socket need to be updated to a new one with a separate data socket? Or will the existing extension socket work, with or without a micro filter connecting to it?

Thanks a lot for your help.
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