Telephone Connection

IDC termination is the best way of terminating telephone wiring. Much better than screw terminal telephone connection because they are prone to over tightening and cutting the wire rather than just gripping it.

Telephone Connection using IDC Connectors

IDC-TerminationThis is the most reliable way of termination and that used extensively by BT. Quick and easy, buy a tool and save damage to the Master Socket or NTE5 as you make your telephone connection. Note that with IDC (Insulation Displacement Connection) you can terminate a maximum of 3 wires per slot on top of each other.




Telephone Connection – Colour Code

There are a few variations of telephone wire colour code.

Stripey internal cable

2 = Blue
3 = Orange (Bell circuit only used between extensions if no Broadband)
5 = White

Old or very new internal cable

2 = Blue
3 = Green (Bell circuit only used between extensions if no Broadband)
5 = Orange

Overhead cable where it comes into the house

2 = Orange
5 = White

Underground cable where it comes into the house

2 = Blue
5 = White

Telephone Connection – Spur star or ring wire?

Telephone extensions can be star wired, daisy chained or spurred. Unlike mains household wiring there’s no need to connect in a ring. Some configurations can slow broadband speed though so a good rule is to have the least amount of spurs and extension wiring attached, maintaining a fast internet connection.




Digital Face Plate or Filter Plate

A Filtered face plate is just that – an add on faceplate with a built in ADSL Broadband filter. This supplies all your extension sockets with the telephone signal, but filters out the Broadband part, keeping the Broadband speed at it’s fastest where the master socket is. You won’t be able to use your router in the extension sockets if you fit this but it acts as a barrier preventing extension wiring from slowing your line down.
This Digital Faceplate has 2 sockets on the front – a smaller connection for your router, and a standard telephone socket for the phone only. This faceplate does away with the need for external ADSL filters.

Telephone Wire Inserter Tool for IDC Extension Sockets

You must use a tool to insert the wires. You can buy a cheap plastic disposable tool for a handful of uses, or a more robust tool which includes a cutter leaving a neat problem free termination in one easy operation. By not using the correct tool you run a high risk of damaging the socket connector blades and they will no longer grip the cable being terminated.

All my images used on this site of Telephone Connection are subject to copyright and are not permitted to be used without my written permission.



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