Pin - Connections for Twisted Pair

Creating Straight Twisted Pair Cable




Here are a few other points to remember when dealing with RJ-45 connectors and twisted-pair cable:

The pins on the RJ-45 connectors aren’t numbered, but you can tell which is pin 1 by holding the connector so that the metal conductors are facing up.



Some people wire 10baseT cable differently — using the green and white pair for pins 1 and 2 and the orange and white pair for pins 3 and 6. This doesn’t affect the operation of the network (the network is color-blind), as long as the connectors on both ends of the cable are wired the same!

If you’re installing cable for a Fast Ethernet system, you should be extra careful to follow the rules of Category-5 cabling. That means, among other things, making sure that you use Category-5 components throughout. The cable and all the connectors must be up to Category-5 specs. When you attach the connectors, don’t untwist more than 1.2 inch of cable. And don’t try to stretch the cable runs beyond the 100-meter maximum. When in doubt, have cable for a 100 Mbps Ethernet system professionally installed.

Creating Crossover Cable

Crossover Cables is a cable that you can use to directly connect two devices without a hub or switch.

You can use a crossover cable to connect two computers directly to each other, but crossover cables are more often used to daisy-chain hubs and switches to each other.

If you want to create your own crossover cable, you have to reverse the wires on one end of the cable.

Note that you don’t need to use a crossover cable if one of the switches or hubs that you want to connect has a crossover port, usually labeled Uplink. If the hub or switch has an Uplink port, you can daisy-chain it by using a normal network cable.