Editing Wake-on-LAN (section)

==Hardware requirements==
Wake-on-LAN support is implemented on the [[motherboard]] of a computer and in the [[network interface controller]]. It is consequently not dependent on the [[operating system]] running on the computer. In order to get Wake-on-LAN to work, enabling this feature on the network interface card or on-board silicon is sometimes required. Details of how to do this depend upon the [[operating system]] and the device driver.

Wake-on-LAN usually needs to be enabled in the Power Management section of a PC motherboard's BIOS/UEFI setup utility, although on some systems, such as Apple computers, it is enabled by default. On older systems the BIOS/UEFI setting may be referred to as WoL; on newer systems supporting PCI version 2.2, it may be referred to as PME (Power Management Events, which include WoL). It may also be necessary to configure the computer to reserve standby power for the network card when the system is shut down.

With older motherboards, if the network interface is a plug-in card rather than being integrated into the motherboard there may be a header onboard connected to the network card via a special three-pin cable the card. Systems supporting the [[PCI Local Bus|PCI]] 2.2 standard and with a PCI 2.2 compliant network adapter card do not usually require a cable as the required standby power is relayed through the PCI bus.<ref>{{cite web |url=http://xlife.zuavra.net/index.php/60/ |archive-url=https://web.archive.org/web/20070308143030/http://xlife.zuavra.net/index.php/60/ |title=Xlife » Using Wake-On-LAN WoL/PME to power up your computer remotely |archive-date=8 March 2007 |work=zuavra.net |access-date=28 October 2015}}</ref> The power supply must meet [[ATX]] 2.01 specifications.

Laptops powered by the Intel Centrino processor technology or newer<ref>{{cite web |url=http://www.intel.com/network/connectivity/products/wireless/prowireless_mobile.htm |title=Intel® PRO/Wireless 3945ABG Network Connection – Overview |work=Intel.com |archive-url=https://web.archive.org/web/20090201155041/http://www.intel.com/network/connectivity/products/wireless/prowireless_mobile.htm |access-date=28 October 2015|archive-date=2009-02-01 }}</ref> (with explicit BIOS/UEFI support) allow waking up the machine using Wake on Wireless LAN (WoWLAN).

In most modern PCs, [[ACPI]] is notified of the ''waking up'' and takes control of the power-up. In ACPI, OSPM must record the ''wake source'' or the device that is causing the power-up{{snd}}the device being the ''soft'' power switch, the NIC (via Wake-on-LAN), the cover being opened, a temperature change, etc.<ref name="download.microsoft.com">{{cite web |url=http://download.microsoft.com/download/5/b/9/5b97017b-e28a-4bae-ba48-174cf47d23cd/cpa002_wh06.ppt |title=ACPI In Windows Vista |first=Allen |last=Marshall |work=[[Windows Hardware Engineering Conference|WinHEC 2006]] |publisher=Microsoft |pages=23–25}}</ref>

The three-pin WoL interface on the motherboard consists of: pin 1, +5V DC (red); pin 2, [[Ground (electricity)|ground]] (black); pin 3, wake signal (green or yellow).<ref>{{cite web |url=http://users.skynet.be/sky50985/optionsb.htm |archive-url=https://web.archive.org/web/20070121141824/http://users.skynet.be/sky50985/optionsb.htm | title=How to connect the UIRT2 B |archive-date=21 January 2007 |work=skynet.be |access-date=28 October 2015}}</ref> By supplying the pin-3 wake signal with +5V DC the computer will be triggered to power up provided WoL is enabled in the BIOS/UEFI configuration.