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Extending BT Telephone Socket with Cat5


I have a BT Master Socket which needs to stay where it is, but I need to extend this about 60m away.

What has been done, is a normal cable (BT to RJ11) has been cut. The BT plug part plugged into the master socket and on the other end, two wires have been joined onto a Cat 5 Cable via a junction box)

The blue and white of blue pair were used.

The Cat 5 cable runs all the way to another BT socket 60m away, and the blue and white of blue pair are plugged into 2 and 5 on the BT socket.

No dial tone!

Qu: Do I need a MODTAP for this type of connection?

Qu: The BT Cable to RJ11 cable has 4 wires in it. Does it make a difference which two are used?

THE BT MAIN CABLE that goes into the BT Master Socket uses the BLACK and GREEN cable.

Please help


Established Member
What you're doing is quite correct, and you don't need a MOD TAP.
The BT line is on pins 2 & 5 from the socket so that's fine. Check to make sure you're connecting the CAT5 cable to pins 2 & 5 on the BT Plug. I'm assuming the cable you're connecting the CAT5 to has 4 wires from the BT plug, connect to the first and last.

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