Category 5. This is an Ethernet cabling standard and one of the most popular these days. To get speeds of 100 Mbps, you need to use CAT5 cables. The term category 5 is used to indicate that this is the 5th generation in cabling standards for twisted pair cables. Each category of cabling standards describes the performance characteristics of the wiring standards. Category 5 is one of the best cabling standards available today. It essentially depends on the number of twists per inch and the higher this number the better the performance of the wiring as it will reject noise and provide greater bandwidth.