P - J21 WOL connector
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J21 WOL connector   The WOL header is a 3-pin connector. The WOL cable runs from the WOL header on the motherboard to the WOL header on a network card that supports WOL. The Magic Packet technology that the WOL header is based on is used to remotely wake up a sleeping or turned off computer on a network. Magic Packet technology is based completely in the local area network (LAN) controller, which allows the computer to go into a very low-power mode that removes the power from the entire computer, except the LAN chip.