What is the transmission speed of usb3.0

The transmission speed of "usb3.0" is "5.0Gbps", which is 500MB per second; "usb3.0" adopts a two-way data transmission mode to simplify the direction of data flow, shorten the transmission time, and add more The physical bus in parallel mode is characterized by a very fast transmission rate and is compatible with "USB2.0" and "USB1.1" devices. The "usb3.0" interface has type A male port, type B male port, and AB universal female port. There are four forms: mouth and B-type female mouth.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What is the transmission speed of usb3.0

The transmission speed of usb3.0 is 5.0Gbps. usb3.0 adopts a bidirectional data transmission mode and adds more parallel mode physical buses. It is characterized by a very fast transmission rate and is compatible with USB2.0 and USB1.1 devices.

usb3.0 transmission speed

The maximum transmission bandwidth of usb3.0 is up to 5.0Gbps, that is, 500MB/s, down Compatible with usb2.0 and usb1.1. Among them, the 5.0Gb/s bandwidth of usb3.0 is not 625MB/s obtained by dividing 5Gb/s by 8, but uses the same 10-bit transmission mode, and adds a pair of corrections on the basis of usb2.0. Wrong code, so its full speed is only 500MB/s. In addition, usb3.0 is the latest USB specification. This specification is mainly initiated by industry giants such as Intel, Microsoft, HP, and Texas Instruments. Compared with usb2.0, it adds more parallel mode physical buses to integrate host control and asynchronous transmission. Combined, it is different from the half-duplex mode of USB2.0 and adopts two-way data transmission to simplify the data flow direction and shorten the transmission time.

Extended content: The usb3.0 specification is affected by the two interface media of optical and copper, and their cable lengths and transmission speeds are also different. In addition, the usb3.0 interface has type A male port, type B male port, The four forms of AB universal female port and B-type female port also have differences in appearance design.

Extended knowledge

USB 3.0 is a USB specification initiated by companies such as Intel. Now updated to USB 3.2 gen 1 by USB IF.

USB 2.0 has been widely recognized by PC manufacturers, and the interface has become a necessary interface for hardware manufacturers.

Please note that the bandwidth of 5Gbps is not 625MB/s obtained by dividing 5Gbps by 8, but uses the same 10 Bit transmission mode as SATA (a pair of error correction codes are added based on USB2.0 ), so its full speed is only 500MB/s.

However, everyone should note that this is a theoretical transmission value. If several devices share a USB channel, the main control chip will allocate and control the bandwidth available to each device. For example, in USB1.1, all devices can only share 1.5MB/s bandwidth. If a single device occupies all the bandwidth of the USB interface, it will make it difficult to use other devices.

USB-IF announced the latest USB naming specification. The original USB 3.0 and USB 3.1 will no longer be used. All USB 3.0 standards will be called USB 3.2. Considering compatibility, USB 3.0, USB 3.1 and USB 3.2 are called USB 3.2 Gen 1, USB 3.2 Gen 2, and USB 3.2 Gen 2x2 respectively.

Data transmission

USB3.0 introduces full-duplex data transmission. Two of the five lines are used to send data, the other two are used to receive data, and one is a ground wire. In other words, USB 3.0 can perform read and write operations simultaneously and at full speed. Previous versions of USB did not support full-duplex data transfer.

Power supply

The USB 3.0 standard requires that the power supply capacity of the USB3.0 interface is 1A, while USB 2.0 is 0.5A.

Power Management

USB 3.0 does not use device polling, but uses an interrupt-driven protocol. Therefore, the standby device does not consume power until an interrupt requests data transfer. In short, USB 3.0 supports states such as standby, hibernate, and suspend.

Physical appearance

The above specifications will also be reflected in the physical appearance of USB 3.0. But the USB 3.0 cable will be "thicker" because the USB 3.0 data cable has 4 more internal wires than the 2.0 one. However, this port is a drawback of USB 3.0. It contains additional connectivity equipment.

Supported systems

Windows 10, Window8.1, Window8, Windows Vista, Windows 7 SP1 and Linux (and Linux-based Android) all support USB 3.0. Apple's latest Apple Mac book air and Mac book pro are also supported. For XP systems, USB 3.0 can be used, but only at USB 2.0 speeds.

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