Phone line exension over CAT5

[hpoom]

I know this has been asked on here before, but I have just done a search and can not find the answer to my question.

My sisters house if all Cat5'ed up. She has a standard BT master socket in the hall (no other phone sockets). I want to leave the phone plugged into this socket, but also run a phone extension over Cat5 to the lounge for the Sky Box.

Also I am hoping after learning how to do this on here house I can use the Cat5 in my next house to distribute all my phonos.

I know I can plug one of these into the RJ45 socket in the lounge:
http://www.letsautomate.com/10638.cfm?

And I can join socket 2 in the lounge to socket 1 in the hall buy using a patch cable in on the patch panel (I am fully sufficent with networking!). So that just leaves me needing to get from a BT style socket to an RJ45 socket. Also I need to split the BT socket so that the phone can still be plugged in.

No as I see it I have 2 options.
1) find a cable that is BT plug on one end and RJ11 or RJ45 on the other (a mate told me an RJ11 plug will go in a RJ45 socket, is this true?) With this I would still need to get a splitter like this:
http://www.shop.bt.com/invt/ccr122

Problem with this idea is a cannot find and BT plug to RJ45 plug cable anywhere? Any ideas?

2) cut a Cat5 cable in half and wire the correct cables of the Cat5 into the back of the master socket.

Problem with this idea is I know nothing about phone cabling so I need somebody to tell me which of the 4 pairs of Cat5 to use and where to wire them in?

Can somebody please help?
Thanks!

[jsap]

An RJ11 socket will fit into an RJ45 socket, so use the BT (or similar) doubler with a modem cable (BT plug to RJ11), into the socket, then in the sky room either use the letsautomate adaptor or a RJ11-RJ11 cable.

[hpoom]

jsap thanks for the reply.

I got some adapters from a mate yesterday but I am not sure the cableing is right. The one on the left is a Master RJ45 to BT, and the one on the right is a secondary RJ45 to BT. I think I need the one on the right but the cables are

RJ45:
pin1 - Black
pin2 - White
pin3 - Green
pin4 - Blue
pin5 - Red
pin6 - Orange
pin7 - (none)
pin8 - (none)

BT Plug
pin1 - Orange
pin2 - Blue
pin3 - Black
pin4 - White
pin5 - Red
pin6 - Green

Now with the pins crossing over any cable I make to go from the BT socket to the RJ45 in the hall will need to have the same cross over in cables so that it all works. So what wires do I need to crip to which pins in the BT plug and RJ45 plugs?

Thanks!

[hpoom]

Originally Posted by jsap

An RJ11 socket will fit into an RJ45 socket, so use the BT (or similar) doubler with a modem cable (BT plug to RJ11), into the socket, then in the sky room either use the letsautomate adaptor or a RJ11-RJ11 cable.

What I am trying to say (but missed in my last post). Is I thought I could make my own RJ11 to RJ45 cable using a crimping tool and some Cat5. But I need to make it cross the cables in the same way that the RJ45 adapter to BT socket does (so something along the lines of the colours and pins numbers above).

Does anybody know why the pins are not just wired pin1 to pin1? Is there a reason for this? Also does anybody have a line to a diagram showing what pins I should wire RJ11 to on the Rj45.

[hpoom]

http://www.mediahub.co.uk/support/rj...ng/wiring.html

This page show the diagram "BT LJU to RJ45 adapters" Which is exactly how my adapter is wired (minus the resistor).

So I guess I can just revirse this when making an RJ11 to RJ45 cable???

[vex]

Originally Posted by hpoom

RJ45:
pin1 - Black
pin2 -
pin3 -
pin4 - Blue
pin5 - Red
pin6 -
pin7 -
pin8 -

BT Plug
pin1 -
pin2 - Blue
pin3 - Black
pin4 -
pin5 - Red
pin6 -

These are the colours/pins you are interested in, 2 and 5 on the BT end carry voice and Pin 3 carries the ringer.

And yep, basically if you just reverse this at the other end then is should all work ok.