BROCADE IP PRIMER

Chapter 1: Networking BasicsT568AT568B1. White with Green stripe 1. White with Orange stripe2. Green 2. Orange3. White with Orange stripe 3. White with Green stripe4. Blue 4. Blue5. White with Blue stripe 5. White with Blue stripe6. Orange 6. Green7. White with Brown stripe 7. White with Brown stripe8. Brown 8. BrownWhich one do you use? In the end, the important thing is to be consistent. Ifyou are using the A-standard, always use the A-standard. If you are using the B-standard, always use the B-standard. This is especially true of the cable itself.If you have used the A-standard on one end of the cable, use the A-standardon the other end of the cable. There's one exception that I'll talk about in aminute.For Ethernet 10Base-T and 100Base-T, only pins 1, 2, 3, and 6 are important.The first pair, 1 and 2, is used to transmit data. The second pair, 3 and 6, isused to receive data. In the A-standard, transmitting is the green pair andreceiving is the orange pair. In the B-standard, it's the opposite. The orangepair transmits, and the green pair receives. The blue pair and brown pair areunused.As I mentioned earlier, a standard Ethernet cable is one that has the samestandard arrangement of cables on both ends of the cable. This is commonlyreferred to as a straight-through cable. This is because a signal sent on pin 1on one side will be received on pin 1 of the other side; a signal sent on pin 2on one side will be received on pin 2 of the other side; and so forth. This cableis used to plug a computer (or most any other device) into an Ethernet hub orswitch.But what if we need to connect two hubs or switches together? Or what if wewant to directly connect two computers together? You would use what is calleda crossover cable. The crossover cable uses one standard on one side, but theopposite standard on the other. For example, if you were using the T568A standard,you would create a crossover cable by making one end of the cable A-standard, and the other end of the cable B-standard. You're matching yourtransmit pair directly to the receiving pair of the other side.24 Brocade IP Primer