There are different types of UTP cable categories , and the numbers refer to their revision .
CAT1 is for telephone and doesnt support network traffic . The wire isn’t twisted . It is use by phone companies for ISDN.
CAT2 is use for token rings networks up to 4 mbps.
CAT3 is use for network up to 10 mbps .
CAT3-4-5 are 4 pairs twisted copper wires.
CAT5e support 1gigabit network.
CAT6 is use for network of more then 1 gigabit and contains a physical seperatir between the 4 pairs to reduce electromagnetic.
2 popular wiring schemes standard are T-586A and T586B
they differ in which color coded pairs are connected – pair 2 and 3 are reversed
Color Codes for T568B
Pin Color Pair Name
1 white/orange (pair 2) TxData +
2 orange (pair 2) TxData –
3 white/green (pair 3) RecvData+
4 blue (pair 1)
5 white/blue (pair 1)
6 green (pair 3) RecvData-
7 white/brown (pair 4)
8 brown (pair 4)
Color Codes for T568A
Pin Color – Pair Name
1 white/green (pair 3) RecvData+
2 green (pair 3) RecvData-
3 white/orange (pair 2) TxData +
4 blue (pair 1)
5 white/blue (pair 1)
6 orange (pair 2) TxData –
7 white/brown (pair 4)
8 brown (pair 4)
UTP cables are terminated with standart connectors , RJ-45 and Punchdown .
The cross-over (X OVER) UTP
The x-over cable allows us to connect two HOSTs like ; PC to PC , switch to swtich , hub to hub or router to router .
only 4 pins are needed for a x-over cable ,
1->3
2->6
3->1
6->2
