Twisted Pair Cables

2 types of Twisted pair cables.

1. Shielded Twisted Pair (STP)
2. Unshielded Twisted Pair (UTP)

Since shielded twisted pair has an external metal shield and is costly, unshielded twited pairs is used.

UTP
Different categories based on Bandwidth.

Category 1 or CAT 1 - Used for telephone communication, not for data transmission.
Category 2 or CAT 2 - 4 Mbps
Category 3 or CAT 3 - 10 Mbps
Category 4 or CAT 4 - 16 Mbps
Category 5 or CAT 5 - 100 Mbps
Category 5e or CAT 5e - Enhanced model of CAT 5.
Category 6 or CAT 6 - 1 Gbps