2 pair cat 5 cable how to#
2 pair cat 5 cable pdf#

You canвЂ™t simply connect the pair to any old combination on the other end, you have to match polarity. Orange/White and Green/White are positive. The solid (or dominant) color is negative. The positive wire on the transmit pair must hook up to the positive wire on the receive pair on the other side. That is, one of the wires in each pair is positive, and one is negative.

There is a polarity involved with the wires in the pair. If you hooked up two computers together, you needed a crossover (null modem connector). A terminal would hook up directly to a computer. For you old-timers, this is similar to RS-232, where there is data communication equipment and data terminal equipment. You have to use a crossover cable to cancel two crossovers. If you hook two hubs together, by connecting pins 1 and 2 of the two hubs together, you are actually connecting the receive pairs of the hubs together. The Hub connects the transmit pair to receive. This is why you canвЂ™t connect two hubs together without using a special crossover port or cable. Hubs and Switches automatically вЂњcross overвЂќ, so you can wire the Transmit pair to the Transmit pair on the Hub, and the hub will actually connect to the Receive pair (confusing). When your NIC receives data, it uses the Receive pair. When your NIC (Network Interface Card) sends data to another device on the network, it uses the pair of wires known as the Transmit pair. If you stick to one standard, you donвЂ™t have to guess what the other end is. The problem arises if you work on the wiring later. You could use any pair you wanted, really, and this is why it doesnвЂ™t matter, technically, if you use 568A or 568B style wiring. All this comes down to the fact that we need to connect pins 1 and 2 on one device to pins 1 and 2 on the other device, and pins 3 and 6 on one device to pins 3 and 6 on the other device. On our cable, orange with a small white stripe is simply orange. Note that orange may be orange with a small white stripe, and orange/white may be white with a small orange stripe. That is, orange and orange/white are twisted together. You can tell what pairs are twisted together by the fact that they share colors. It is important that the pairs are twisted together. What does this mean, really? Well, the ethernet devices communicate on two pairs of wires. Green/White should be on the left, with the tab facing away from you as you look at the plug. So, if you want to make a Cat5 cable and have a couple RJ-45 connectors, some wire, and a crimper, look at the 568A diagram and match the colors on both plugs. 568B is quite widely used, especially in the US however, new wiring installs should probably follow 568A.

2 pair cat 5 cable pdf#

We wrote up a couple pdf diagrams for these you can refer to: 568A, 568B. There are many different schemes for wiring Category 5 cables, EIA/TIA 568A and 568B are the most common.

2 pair cat 5 cable how to#

Part 1 вЂ“ How to wire Cat5 cables, and how they work.