DARARITH's Blog

How to wire Ethernet Cables

What You Need:

Required:

• Ethernet Cable - bulk Category (Cat) 5, 5e, 6, 6a or higher ethernet cable
• Wire Cutters - to cut and strip the ethernet cable if necessary
• For Patch Cables:
  • 8P8C Modular Connector Plugs ("RJ45")
  • Modular Connector Crimper ("RJ45")
• For Fixed Wiring:
  • 8P8C Modular Connector Jacks ("RJ45")
  • 110 Punch Down Tool

Recommended:

• Wire Stripper
• Cable Tester

Ethernet Cable Pin Outs:

There are two basic ethernet cable pin outs. A straight through ethernet cable, which is used to connect to a hub or switch, and a crossover ethernet cable used to operate in a peer-to-peer fashion without a hub/switch. Generally all fixed wiring should be run as straight through. Some ethernet interfaces can cross and un-cross a cable automatically as needed, a handy feature.

Standard, Straight-Through Wiring Diagram(both ends are the same):

RJ45 Pin #	Wire Color (T568A)		10Base-T Signal 100Base-TX Signal
1	White/Green		Transmit+
2	Green		Transmit-
3	White/Orange		Receive+
4	Blue		Unused
5	White/Blue		Unused
6	Orange		Receive-
7	White/Brown		Unused
8	Brown		Unused

Straight-Through Ethernet Cable Pin Out for T568A

RJ45 Pin #	Wire Color (T568B)		10Base-T Signal 100Base-TX Signal
1	White/Orange		Transmit+
2	Orange		Transmit-
3	White/Green		Receive+
4	Blue		Unused
5	White/Blue		Unused
6	Green		Receive-
7	White/Brown		Unused
8	Brown		Unused

Straight-Through Ethernet Cable Pin Out for T568B

____________________________________________________

Crossover Cable Wiring Diagram(T568B):

RJ45 Pin # (END 1)	Wire Color		RJ45 Pin #  (END 2)	Wire Color
1	White/Orange		1	White/Green
2	Orange		2	Green
3	White/Green		3	White/Orange
4	Blue		4	Blue
5	White/Blue		5	White/Blue
6	Green		6	Orange
7	White/Brown		7	White/Brown
8	Brown		8	Brown

Crossover Ethernet Cable Pin Outs
+Note: The crossover ethernet cable layout is suitable for 1000Base-T operation, all 4 pairs are crossed.

Source: ertyu.org