Can someone help me identify what these cables are for?

I'm guessing (and hoping) the one in the bedroom is for a cat 5 wall socket -- and that these corresponds to some of the cables exiting in the basement ceiling.

Bedroom wall

cables wall bedroom

Basement ceiling

cables ceiling basement

  • \$\begingroup\$ Doesn't look like cat5: wrong colours, not twisted. Alarm system? \$\endgroup\$
    – pjc50
    Sep 23, 2015 at 13:11
  • \$\begingroup\$ You're right. Not cat5 unfortunately. \$\endgroup\$ Sep 23, 2015 at 13:20
  • \$\begingroup\$ Hm. Why the downvote? Is this the wrong place for such questions? \$\endgroup\$ Sep 23, 2015 at 13:21
  • \$\begingroup\$ Spy cameras I reckon LOL. \$\endgroup\$
    – Andy aka
    Sep 23, 2015 at 14:22

1 Answer 1


The cables in the top photo seem to be telephone wires, but certainly not cat5 cables. It looks like two telephone wires were connected together.

Cat5 ethernet cables always have 8 insulated wires, grouped into 4 twisted pairs. The cable is thicker and the insulation quite thin so that you can see bulges formed by the twisted pairs.

In the bottom photo I can't see the cable(s), but the colors are wrong for cat 5 cable.

More information on cat5 cable, including the proper colors, can be found e.g. here.

  • \$\begingroup\$ I see. Thanks for the info. I realize a little research would have ruled out the cat5 possibility. \$\endgroup\$ Sep 23, 2015 at 13:17
  • \$\begingroup\$ Two telephone wires connected together? That sounds like ISDN. \$\endgroup\$ Sep 23, 2015 at 13:22

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