#usb_connectors

To understand the usb interface, you must first understand its concept. In English, usb is the abbreviation of Universal Serial Bus, translated into Chinese is the meaning of "universal serial bus". It is not a new bus standard, but a new interface technology for PC applications. In 1995, the usb interface was already used on the PC, but due to the lack of software and hardware support, the USB ports of these PCs were idle. Until 1998, with Microsoft's built-in support module for USB interface in Windows 98, and the increasing number of USB devices, the USB interface gradually entered the practical stage.

USB uses a 4-pin plug as a standard plug. With this standard plug, all peripherals can be connected in a daisy chain without losing bandwidth. The USB standard divides USB into five parts: controllers, controller drivers, USB chip drivers, USB devices, and client drivers for different USB devices.

USB requires support from the host hardware, operating system, and peripherals to work. At present, the motherboard generally adopts a control chipset that supports USB functions, and also has a USB interface slot. Windows 98 and above have built-in support for the USB interface (but Windows NT does not yet support USB). At present, there are many USB peripherals such as digital cameras, digital speakers, scanners, keyboards, and mice. With the popularity of a large number of USB-enabled PCs, USB has gradually become the standard interface for PCs. The latest PCs support almost 100% of USB, and devices that use USB interfaces are also growing at an alarming rate. Currently we are using the USB1.1 standard interface, which has a transmission speed of 12Mbps. USB 2.0 standard The seven vendors, COMPAQ, Hewlett Packard, Intel, Lucent, Microsoft, NEC, and PHILIPS, have jointly developed the USB 2.0 interface standard. USB 2.0 increases the data transfer speed between devices to 480Mbps, which is about 40 times faster than the USB 1.1 standard. The biggest benefit for users is that they can use more efficient external devices and have multiple speeds. Peripherals can be connected to USB 2.0 lines, unlike the USB 1.1 era, because high bandwidth allows more devices to worry about bottlenecks during data transmission. USB 2.0 can use the same specifications of the cable in the original USB definition. The specifications of the connector are also the same. Under the premise of high speed, the excellent features of USB 1.1 are maintained, and backward compatibility is also guaranteed.

According to the latest USB naming convention published by USB-IF, the original USB 3.0 and USB 3.1 will no longer be named. All USB standards will be called USB 3.2. Of course, considering compatibility, USB 3.0 to USB 3.2 are called respectively. USB 3.2 Gen 1, USB 3.2 Gen 2, USB 3.2 Gen 2x2.

For the new USB 3.2 Gen 2x2 naming, it uses all the data pins up and down to double the data speed. So, when will the USB 3.2 Gen 2x2 device be used?

The USB-IF standards group revealed that the USB 3.2 Gen 2x2 controller will be available later in 2019, meaning that consumers will be able to use the latest standards in their desktops during the year. In other words, consumers can use existing devices by purchasing peripherals that support the USB 3.2 Gen 2x2 standard.

For the USB socket and the standard big name, including USB 3.0 and USB 3.1, after the unified system, everyone is called USB 3.1. For example, in July 2013, after USB 3.1 was released, USB-IF called all USB 3.X USB 3.1, including USB 3.1 Gen 1 and USB 3.1 Gen 2. Now that USB 3.2 has been released for a while, USB-IF has to do something new, and that is the reunification of the USB 3.X series.