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Crimping Pliers.

Types of Cable

Data communications cables and plugs

Ok, so moving on now to Data communications cables and the crimp connectors used.


First let’s have a look at the wires used.

These multicore wires are known as twisted pair cables.

Twisted pair cables were first used in telephone systems by Alexander Graham Bell in 1881. By 1900, the entire American telephone line network was either twisted pair or open wire with similar arrangements to guard against interference. Today, most of twisted pair cables in the world are outdoor landlines, owned by telephone companies, used for voice service, and only handled or even seen by telephone workers. The majority of data or Internet connections also use these wires.

Modular plugs

To connect these wires to equipment such as phones or computers the wires are crimped in to plugs known as modular plugs.


So that the correct ratchet crimping pliers can be selected, it is necessary to explain a little about the different types of modular plugs available.

Modular plugs have a standardised naming scheme. In the picture on the right you can see that there are 8 pins (positions) that wires can be connected to. If all 8 wires are connected, it would be an 8 position 8 connection plug - an 8P8C.


It follows that a 6P6C plug would have 6 positions and 6 connections. Equally you could have a 6P4C plug which has 6 positions but only 4 wires connected.

Have a look at one connected to your computer or phone to see if you can tell what it is.

Quite straightforward? Well, sometimes a modular plug is specified by what plug socket it will go into and the wiring connections in that socket which is an American standard that is sometimes quoted. This system uses an RJ code to define how the plug is to be wired.


And it can get complicated, so to avoid confusing the life out of you, let’s leave that to the wiring experts – this cross reference is perfectly OK for selecting the right crimping pliers:


                                 6P4C = RJ11
                                 6P6C = RJ12
                                 8P8C = RJ45

So what exactly is the role of the modular plug ratchet crimping pliers?


Quite simply, it presses the wires into the connectors in the plug, making sure they are all in the right places and secure.

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