The USB interface has 4 cables, the USB interface is laid flat, in order is 1, 2, 3, 4 contacts, the corresponding power cable, data cable, data cable, ground, that is, red, green, white, black, details are as follows:
1, VBUS (4.75-5.25V), power cord, red cable.
2, data-, data transmission line, green line.
3, data+, data transmission line, white line.
4. gnd, ground wire, black wire.
Extended data
USB supports four basic data transfer modes: control transfer, isochronous transfer, interrupt transfer, and data block transfer. Each transmission mode, applied to a terminal with the same name, has different properties.
1. Control transmission type: Support the transmission of control, status, configuration and other information between peripherals and hosts, providing a control channel between peripherals and hosts. Each peripheral supports a control transfer type so that configuration and command\/status information can be transmitted between the host and the peripheral.
2, isochronous (lsochronous) transmission type (or synchronous transmission) : support periodic, limited delay and bandwidth and data transmission rate unchanged between the peripheral and the host data transmission. This type is error-free, so it cannot guarantee correct data transmission, and supports data transmission like computer-telephone integrated system (CTI) and audio system with the host.
3, interrupt transmission type: Support such as gamepad, mouse and keyboard input devices, the amount of data transmission between these devices and the host is small, no periodicity, but sensitive to response time, require immediate response.
4, data block (Bulk) transmission type: support printers, scanners, digital cameras and other peripherals, the amount of data transmitted between these peripherals and the host is large, USB in the case of meeting the bandwidth for this type of data transmission.
USB uses the block bandwidth allocation scheme. If a peripheral exceeds the current bandwidth allocation or potential requirements, the device cannot be accessed. Terminals of the synchronous and interrupt transmission types retain bandwidth and ensure that data is transmitted at a certain rate. The central and control terminal transmits transmission data at the best available bandwidth.
The phone charger socket connection method is very simple. First insert the plug into the jack of the phone charger, then insert the other end of the plug into the wall outlet.
Before inserting the plug, make sure that the power switch of the phone charger is turned off. Once plugged in, the phone charger's indicator light should light up to indicate that it is charging. Remember not to unplug during the charging process to avoid affecting the charging speed or the battery life of the phone.
After charging, the plug should be unplugged in time to avoid wasting power and safety risks.
To connect a phone charger socket to a wall outlet, first make sure that both the socket and the charger are of the same standard, such as a European standard or an American standard.
Then, plug the charger into the wall outlet, making sure it is fully plugged in.
Next, connect the other end of the charger to the charging port of your phone, making sure that the plug matches the charging port exactly.
Finally, turn on the power switch of the socket, and the phone will start charging. Make sure to use the appropriate charger and the correct connection method to ensure safe charging.
When using the phone charger socket, ensure that the device is plugged in the correct direction. In general, the plug should be inserted into the jack on the left side of the socket, and the pin at the bottom of the device should be aligned with the jack on the right side of the socket. Finally, gently press the plug to make sure the device starts charging. Do not remove or disconnect the device during charging. Otherwise, the charging effect may be affected.