This is good for testing link connectivity on an Ethernet card – if the adapter can establish a link with itself the hardware on the adapter is probably OK. Ethernet Loopback Adapters are little handy pieces of equipment that route the transmitting pins in an Ethernet jack back to the receiving pins in the same jack. Use a cable tester to verify the proper connectivity of the cable.This post will be short (and sweet).

Crimp the RJ45 end with the crimper toolĬut the cable to length - make sure it is more than long enough for your needs Repeat the above steps for the second RJ45 end.

Verify the wires ended up the right order and that the wires extend to the front of the RJ45 end and make good contact with the metal contacts in the RJ45 end. Insert the wires into the RJ45 end - make sure each wire is fully inserted to the front of the RJ45 end and in the correct order. Trim all the wires to the same length, about 1/2' to 3/4' left exposed from the sheath. Untwist the pairs - don't untwist them beyond what you have exposed Align the colored wires according to the diagrams above. Strip off about 2 inches of the cable sheath. RJ45 Pin #(End 1) Wire Color Wire Diagram RJ45 Pin# (End 2) 1 White/Orange White/Green 2 Orange Green 3 4 Blue White/Brown 5 White/Blue Brown 6 7 8 RJ45 Pin # Wire Color Wire Diagram 10Base-T Signal 100Base-TX Signal 1000Base-T Signal 1 White/Green Transmit+ BI_DA+ 2 Green Transmit- BI_DA- 3 White/Orange Receive+ BI_DB+ 4 Blue Unused BI_DC+ 5 White/Blue BI_DC- 6 Orange Receive- BI_DB- 7 White/Brown BI_DD+ 8 Brown BI_DD-Ĩ Cross Over Cable 1 White/Orange White/Green 2 Orange Green 3 4 Blue Orange / Orange-white Green / Green-white Blue / Blue-white Brown / Brown-whiteĥ About the RJ45 Ends: The RJ45 end is a 8-position modular connectorĪ straight through cable used to connect to a hub or switch, and A cross over cable used to operate in a peer-to-peer fashion without a hub/switch.ħ Standard, Straight-Through Wiring (both ends are the same): One wire in the pair being a solid or primarily solid colored wire and the other being a primarily white wire with a colored stripe.Ĥ Internal Cable Structure and Color Coding Wires are twisted into 4 pairs of wires, each pair has a common color theme. Inside the cable, there are 8 color coded wires. Presentation on theme: 'How to wire Ethernet Cables'- Presentation transcript:Ģ Tools Required CAT 5 Cable - bulk Category 5, cable RJ45 EndsĬrimper for RJ45 Wire Cutters - to cut and strip the cable if necessary Cable Tester

How to make a ethernet loopback cable