Mon Oct 24 15:18:07 CST 2022
In 1996, the usb standard, jointly designed by Intel, Microsoft, ibm, Compaq, NEC, and many other companies, was introduced. Most keyboards, mice, smartphones, and printers, etc. use the usb standard for power supply and data transfer.
USB standard has become an integral part of our digital life, but for the usb standard itself, after more than two decades of development, its branches and derivatives are more complex, until the USB-IF changed the naming rules to USB3.0/USB4.0 to: USB 5Gps, USB 10Gps, USB 20Gps, USB40Gps, from then on by speed to name.
The full name of USB is Universal Serial Bus, as the name implies, USB was created to achieve the purpose of "UNIVERSAL" from the beginning.
Before the birth of USB, keyboard, mouse more than the use of ps two interface, gamepad has a special game port, printers and other peripherals, but also more than the use of serial port and parallel port connection.
For example, the use of PS/2 interface keyboard, mouse, it must be plugged in before the computer is turned on to use, while the use of USB standard devices can be achieved with plug and play.
USB is also very easy to expand using USB hub to achieve one point multi-interface.
With USB interface, fast transmission speed, easy to use, flexible connection. And the USB standard itself does not require a license fee, so it quickly replaced other similar standards.
Nowadays, computers are almost invisible to those old interfaces, and having a USB interface can meet the needs of connecting most devices.
But today the USB standard has not been able to achieve complete universality, the USB standard in order to meet the needs of all kinds of different devices, using a considerable number of different kinds of interfaces.
One of the interfaces we are most familiar with is this one, which is known as the standard Type-A interface.
Another common interface such as the standard Type-B, this interface is mostly for the printer connection port.
Type-B corresponds to the small size of the interface is Mini-B. Many old mp3, mp4, and old cell phones use this interface, many people also directly called it mini-USB. It's very popular in the era before the smartphone.
The following kind is called micro-B, which is the micro-USB interface we often hear about. Android devices often use this type interface. Since the implementation of the EU standard in 2007, more and more cell phones and Bluetooth headsets have started to use micro-B.
There is also a high-speed version of micro-B: "Micro-B super speed", an interface mostly found in early mobile hard drives.
But micro-B series has been replaced by the latest Type-C interface, Type-C interface has only one form, and does not distinguish between positive and negative, more convenient to use. Now most of the new cell phones, tablets, notebooks, etc. are equipped with Type-C interface.
In addition to the commonly used ones, USB has many other interface forms. USB interface types are complicated, how to figure out the difference between them? You just need to divide them into three types of A/B/C, standard, mini, micro, three size standards as below.
The standard USB interfaces all use the USB protocol, and although they don't look the same, they are all USB standards.
The lightning interface used by Apple also uses the USB protocol, but the lightning interface is not the standard interface for USB.
With the development of TypeC interfaces, these complex interfaces are destined to become museum displays. One interface to connect all devices will become possible, and USB will not be far from being truly UNIVERSAL.
USB has evolved from the initial 1.5Mbps to today's 40Gbps.
It is not the form of the USB interface that determines the maximum transfer speed of USB, but the version of USB protocol supported by the interface.
By HornmicLink_Henry @221024 15:38