I have recently moved into a new apartment and I have rewired a couple of phone sockets as the had clearly been messed with before. While decorating I removed a blanking plate in the living room and found phone wires behind. I believe this might have been an optional upgrade when the flat was built, but they obviously wired them anyway and just put the socket on.

Behind this plate are 2 wires. One has a white sheath and looks like all the others in the flat. The other has a grey sheath and is different. As far as I can tell this is the last socket in the chain.

Where could the grey one go?

  • How many wires are in each set? It sounds like you might have a Cat3(24/6) and a Cat5e(24/8) wire. Can you post a picture? – Machavity Oct 12 '17 at 12:44
  • From memory 4 or 5 twisted pairs. This is the only socket with the different wire. I'll try and take a photo later – Mark Tickner Oct 12 '17 at 15:00
  • I have wired the socket into the white sheathed wire and my router has an internet connection. They were both 4 pair – Mark Tickner Oct 12 '17 at 17:51
  • 1
    They're both Cat5e then (which is more common of late). So sounds like one is being used as Ethernet then. – Machavity Oct 12 '17 at 18:14

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