What is the speed of usb2.0 and 3.0

Theoretically, the transmission speed of USB1.1 can reach 12Mbps/second, while USB2.0 can reach the speed of 480Mbps/second (60MB/s); USB3.0 is the latest USB specification, characterized by the transmission rate Very fast, the maximum transmission speed can reach 5.0Gbps/second (500MB/s). USB3.0 is 10 times faster than the current 480Mbps USB2.0, its appearance is basically the same as the current USB interface, and it is compatible with USB 2.0 and USB 1.1 devices.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

USB, the abbreviation of English Universal Serial Bus, is an external bus standard used to standardize the connection and communication between computers and external devices. It is an interface technology applied in the PC field.

What is USB 2.0?

USB2.0 (Universal Serial Bus2.0, Universal Serial Bus) is a new interface technology used in the computer field. The USB interface has the characteristics of faster transmission speed, support for hot swapping and connection of multiple devices. It has been widely used in various types of external equipment. There are four (five) types of USB interfaces: USB1.1, USB2.0, USB3.0 and USB3.1 (3.1Gen 1 and 3.1Gen 2).

Theoretically, the transmission speed of USB1.1 can reach 12Mbps/second, while USB2.0 can reach the speed of 480Mbps/second (i.e. 60MB/s), and can Compatible with USB1.1.

USB2.0 is several times faster than USB1.1, but it requires driver cooperation! The USB port and USB peripherals on the motherboard are required to be USB2.0 in order to achieve the working speed of USB2.0. As long as If one is not USB2.0, it will work in USB1.1 state.

What is USB 3.0?

USB 3.0 is the latest USB specification. This specification is mainly initiated by industry giants such as Intel, Microsoft, HP, Texas Instruments, NEC, and ST-NXP. It is characterized by very fast transmission rates and can theoretically It reaches 5.0Gbps/second (500MB/s), which is 10 times faster than the current 480Mbps High Speed ​​USB (referred to as USB 2.0). The appearance is basically the same as the current USB interface, and it is compatible with USB 2.0 and USB 1.1 devices.

Extended information:

The reason why USB 3.0 has "super speed" performance is entirely due to technological improvements.

Compared with the USB 2.0 interface, USB 3.0 adds more parallel mode physical buses.

You can pick up a USB cable nearby and look at the interface part.

Based on the original 4-wire structure (power, ground, 2 data), USB 3.0 adds 4 more lines for receiving and transmitting signals.

So there are a total of 8 lines, whether in the cable or on the interface.

It is the additional 4 (2 pairs) lines that provide the bandwidth required by "SuperSpeed ​​USB" to achieve "super speed".

Obviously 2 (1 pair) lines on USB 2.0 are not enough.

In addition, the signal transmission method still uses host control, but it is changed to asynchronous transmission.

USB 3.0 utilizes a bidirectional data transmission mode, instead of the half-duplex mode of the USB 2.0 era. Simply put, data only needs to flow in one direction, which simplifies the time consumption caused by waiting.

In fact, USB 3.0 does not adopt any advanced technology that is rarely heard of, but it theoretically increases the bandwidth by 10 times. Therefore, it is more approachable and friendly. Once SuperSpeed ​​USB products come out, more people can easily accept them and make better customized products.

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