Category 5 Cable

Category 5 cable (Cat 5) is a twisted pair cable for carrying signals. This type of cable is used in structured cabling for computer networks such as Ethernet. The cable standard provides performance of up to 100 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet). Cat 5 is also used to carry other signals such as telephony and video. In some cases, multiple signals can be carried on a single cable; Cat 5 can carry two conventional telephone lines as well as a single 100BASE-TX channel in a single cable.

The cable is commonly connected using punch down blocks and modular connectors. Most Category 5 cables are unshielded, relying on the twisted pair design and differential signaling for noise rejection. Category 5 has been superseded by the Category 5e (enhanced) specification. Category 6 cable supports even higher speeds.

TIA/EIA-568-A.1-2001 T568A Wiring
Pin Pair Wire Color
1 3 1 white/green
2 3 2 green
3 2 1 white/orange
4 1 2 blue
5 1 1 white/blue
6 2 2 orange
7 4 1 white/brown
8 4 2 brown
TIA/EIA-568-B.1-2001 T568B Wiring
Pin Pair Wire Color
1 2 1 white/orange
2 2 2 orange
3 3 1 white/green
4 1 2 blue
5 1 1 white/blue
6 3 2 green
7 4 1 white/brown
8 4 2 brown
USOC/RJ61 Wiring
Pin Pair Wire Color
1 4 tip white/brown
2 3 tip white/green
3 2 tip white/orange
4 1 ring blue
5 1 tip white/blue
6 2 ring orange
7 3 ring green
8 4 ring brown

Read more about Category 5 Cable:  Cable Standard, Characteristics

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