6-Pack 4-Pair Ethernet Loopback Plug, Pinout 1-3,2-6,4-7,5-8 Green, TS-UL02-6 

Ethernet RJ45 Plug with Pin-1 connected to pin-3, Pin-2 connected to Pin-6, Pin-4 connected to Pin-7 and Pin-5 connected to Pin-8.
This pinout is needed to make a network card operate as though it is connected to a live network. Ideal for testing Ethernet networks and for any other applications that require this type of Loopback plugs.

Specifications:

CablesOnline Part Number: TS-UL02-6