Phone extension

[Capn Ahab]

Have been asked to connect a phone extension where cable with 3 twisted pairs has already been pulled in.

First of all I thought phone line only had four wires? A phone jack only has 4 connections AFAIK anyway.

The main question though is whether fitting a slave socket at each end with a jack to jack connector at the origin will work?

Cheers.

 

[ashrow]

you only need 3 cores for the phone extension
Terminal 2, 3 and 5
Terminal 3 is the ringer core, a master phone point only needs 2 and 5

Correct colour code if i remember rightly
2 blue white
3 orange white
5 White blue

Hope this helps

 

[Capn Ahab]

So I'd better just tuck the other three cores out the way then.

 

[ashrow]

yep

 

[Capn Ahab]

The phone isn't working. Connected as above, but also terminated white/orange in 4. Phone dead. I have no idea how to test, but I suspect the phone cable that has been there "since forever" may be damaged somewhere along the 20M run.

Anyone got any suggestions? It is in a local supermarket, so there are several phones dotted about.

 

[ayjay]

did you use the correct tool to attach the wires into the blade connectors in the plate?

 

[Geordie Spark]

The phone isn't working. Connected as above, but also terminated white/orange in 4. Phone dead. I have no idea how to test, but I suspect the phone cable that has been there "since forever" may be damaged somewhere along the 20M run.

Anyone got any suggestions? It is in a local supermarket, so there are several phones dotted about.

Are you saying you don't know how to test for continuity??

If your answer is "yes", then this once fine forum really has gone to the dogs !!!

You say: "there are several phones dotted about" This may mean they are part of a system whereby one phone can call another in the supermarket i.e. till operator to manager's office.

If this is the case you'll probably need ALL the cores connected at all the sockets.

It makes no difference to the working which colours you use - so long as 2 goes to 2, 3 goes to 3 etc. but the normal convention is:

2 Blue with white stripe
3 Orange with white stripe
4 White with orange stripe
5 White with blue stripe

The greens will go to terminals 1 & 6.

 

[Rappid]

Measure the voltage, you should have 50v dc, will give you a idea where the break is if you measure at every connection point.

 

[Adam W]

I was thinking along the same lines as Geordie - chances are it's not simply a case of master and slave, but each extension goes back to a switch, so staff can call between extensions.
The supermarket and their head office probably don't want customers, suppliers etc calling up and having their call answered by some naughty customer who has heard the phone ringing on the shop floor.

 

[SYKRAPS]

Find the other end Capn Ahab and ensure that the the terminal numbers and colour codes match, you say that the cable was already pulled in so are you sure it is connected at the other end?

Also if it is part of a cabinate installation you may need to fit a patch lead at the cabinate end to make your outlet live.