How to make your own network cables

We show you how to clean up the rat's nest of cables behind your PC by making custom-length network cables.

By Marco Chiappetta, PC World |  Networking, network

You'll find a couple of standard wiring schemes and types of network cables. The Telecommunications Industry Association's T568A and T568B standard wiring schemes define the order of the individual wires and pin-outs for eight-pin modular connectors and jacks, such as those used for network cables. Depending on how you wire the cables, you can make "straight-through" or "crossover" cables; I'll give you more details on what those are in just a moment. First, take a look at the following diagrams to figure out how to arrange the wires to make your cable.

For most home-networking circumstances, you'll want to use the T568B wiring scheme and straight-through cables. The network cables currently connecting your broadband modem, router, and PC or media player to your network switch are all straight-through cables. The T568A wiring scheme may be present in some preexisting residential network wiring or other similar projects, but the vast majority of premade network cables available at retail (at least in our experience) use T568B.

Crossover cables are a different matter. Crossover cables serve only to connect similar devices together, in lieu of a network switch or hub. For example, you can connect two PCs directly to each other to transfer data between them using a crossover cable. Years ago, connecting one network switch to another also required a crossover cable, but most modern switches, hubs, routers, and similar devices are now equipped with Auto-MDIX ports that can detect whether a crossover is required and automatically choose the MDI or MDIX configuration necessary to properly connect to whatever device is at the other end of the cable.

I have included the diagrams above to illustrate the different wiring schemes. Inside standard CAT 5, 5e, and 6 cable, you'll find four twisted pairs of wire of varying colors: orange with orange/white, green with green/white, blue with blue/white, and brown with brown/white. You may also see some fibers in the cable that add tensile strength, and that you can cut off when you're crimping on a connector--the fibers don't carry any electrical signals.

To make a common, straight-through cable, you need to arrange the internal wires and place them into connectors with the same T568B (or T568A) scheme at both ends of the cable. To make a basic crossover cable, use T568A at one end and T568B at the other. Or, to make a 1-gigibit-suitable crossover cable, you must cross all four of the pairs.

Next Page: Preparing and Making Cables

Prepare the Cable


Originally published on PC World |  Click here to read the original story.
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