Wake-on-LAN (WOL) is a technology in which the network card cooperates with other software and hardware to send specific data to the network card in the standby state, so that the computer starts from the shutdown state.
Below are the Fulfillment conditions:
Folding hardware requirements
To achieve Pos equipment with remote wake-up technology, the hardware requirements are mainly reflected in the power supply, motherboard and network card.
Folding power supply
Pos terminal's power supply must be an ATX power supply that meets the ATX 2.01 standard or higher, and the + 5V Standby current should be at least 600mA or more. Mainly to ensure that after the main power supply of the power supply stops working, the main board and network card work power is supplied through the Standby line. P3 processors are supported in the future.
Prior to the PCI 2.1 and 2.1 standards, motherboards that support remote wake-up usually have a dedicated 3-pin socket to ensure that power is supplied to the network card in the shutdown state (powered by the PCI slot during work). Since most current motherboards support the PCI 2.2 standard, + 3.3V Standby power can still be provided directly to the network card through the PCI slot when the host is down, so there is no need for an additional 3-core power cable to power the network card. Motherboards that comply with the PCI 2.2 standard support remote wake-up on power supply, but some cannot respond to the power-on signals of network cards and PCI devices. For motherboards that support remote wake-up, the network card and PCI device boot function must be turned on in the BIOS settings. For example: "Wake on LAN" "Wake on PCI Card" "power on lan" "power on pci card" settings.
Folding network card
The network card must support the WOL standard, which was first proposed by AMD. To know if your network card supports WOL, after you confirm that the power supply and motherboard support, you can first shut down the computer, and then check the network cable connection status indicator on the device connected to your network card. If the connection indicator is on, your network card supports the WOL function (even if the function is not enabled in the motherboard BIOS), if the connection indicator is off, your network card does not support the WOL function.
After pos hardware debugging and support, you can send specific data to the network card that is still in some working state through the device connected to the network card. The content of the data card is the MAC address of the 16-bit network card. After receiving the data, the network card compares its MAC address. If it is correct, the network card will send a boot signal to the motherboard through the PCI slot, and the pos computer starts.