"Edit: The connector in question is definitely a WOL connector.
Another edit: The WOL cable is only needed on motherboards that do not support the PME portion of the PCI 2.2 standard. If yours is a reasonably recent motherboard, then you should be able to configure WOL in the Power Management section of your BIOS and will not need the WOL cable.
If the connection looks like the following picture, then it is a WOL connection.
The WOL connection accepts a cable that looks something like the following picture.
Every WOL cable that I have ever seen has red and green wires, along with some other color.
The other end of the WOL cable connects to the WOL port on your motherboard.
If your motherboard has an integrated NIC, then your motherboard may not have a WOL port."