Loopback Plug:

Loopback plug is use to check the working of NIC (Network Interface Card).

After Plugging in if it shows connected, that means the your NIC is working.

The Formula to create loopback plug is

1        2

^        ^

|         |

3       6

that means  one end the first wire is attached to PIN 1 and the other end is attached to PIN 3

and the other wire, one end is attached to PIN 2 and the other end is attached to PIN 6.

 

In this loopback PIN1 and PIN 2 will send the data and PIN 3 and PIN 6 will receive the data