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The difference between usb3.1 and 3.0, what are advantages of usb3.1?


USB 3.1 is latest USB specification developed by big companies like Intel. The data transfer rate can be increased up to 10 Gbps. Compared to USB 3.0 technology, new USB technology uses a more efficient data encoding system and more than doubles effective data transfer rate. It is fully backwards compatible with existing USB connectors and cables.

USB3.1 is compatible with existing USB 3.0 software stacks and device protocols, 5Gb/s hubs and devices, and USB 2.0 products.

USB 3.1 has three connection interfaces: Type-A (Standard-A), Type-B (Micro-B) and Type-C

The difference between usb3.1 and 3.0, what are advantages of usb3.1?

Type-A(Standard-A)(left) and Type-C(right)

The difference between usb3.1 and 3.0, what are advantages of usb3.1?


Standard Type-A is currently most widely used interface method, Micro-B is mainly used in devices such as smartphones and tablets, and new defined Type

-C is primarily intended for thinner devices.

Type-C greatly reduces appearance and is more suitable for short and thin portable devices. Type-C will replace Micro-AB connector (supports direct transfer of USB devices, does not require host management intervention). will also replace normal Micro-USB connector, Type-C imitates Apple Lightning connector, both front and back can be plugged in and used normally, which is more ideal than existing Micro-USB, although Micro-USB has strong protection Reverse connection prevention function mechanism, but advantage of both positive and negative connection is better than reverse connection prevention, and wiring can be successfully completed in dark. In addition, Type-C also has improved EMI and RFI suppression performance.

Baud rate and coding standard

In response to use of high-speed applications of various devices, USB throughput has been significantly improved from version 1.0 (1.5 Mbps), version 1.1 (12 Mbps), version 2.0 (480 Mbps) to version 3.0 ( 5 Gbps). future needs, new USB 3.1 interface will double bandwidth to 10Gbps, and it is worth noting that encoding speed will also be increased again.

USB 3.0 is 8b10b encoded, meaning in every 10 bits of data transmitted, only 8 bits are real data, and remaining 2 bits are used as a control code, so all bandwidth will be wasted by 20% (2/ 10) New USB 3.1 uses 128b/132b encoding. In 132-bit data, only 4-bit code is used as a control code, and transmission loss rate is greatly reduced to 3% (4/132), so USB 3.1 will not only increase bandwidth. That's all , even transmission efficiency has been greatly improved. In addition, compared to Thunderbolt, USB 3.1 and Thunderbolt1 share same 10Gbps, while Thunderbolt 2 provides 20Gbps, but it only combines two independent 10Gbps of original Thunderbolt 1 into a 20Gbps one-way transmission /s instead of two-way. , and from this point of view, as long as USB 3.1 device is officially released to market, it will still have advantages in terms of bandwidth speed and application breadth.

Power Supply Rules

Compared to USB 2.0's 5V/0.5A, USB 3.0 provides 5V/0.9A power. But people still want a more powerful power supply, so USB 3.1 (SuperSpeed+) has raised maximum allowed power standard to 20V/5A, and power supply is rated at 100W.

Power Supply Specification - USB Power Delivery (USB PD) is intended forFor compatibility with existing USB 2.0 and USB 3.0 cables and connectors, and new USB 3.1 Type-C connector is also universal. USB PD supports higher voltage and current to match various application devices, and is also compatible with current USB Battery Charging 1.2 specification. USB PD is a port-to-port architecture. USB and power communication signals are separated. Power supply is transmitted through VBus communication protocol between host and device. If device supports it, configuration voltage and current can be used (profiles) Provides higher power. USB PD is divided into 5 profiles according to different devices, each requiring use of new detectable wires to provide more than 1.5A or 5V power. output power - more than 5 V / 0.9 A (4.5 W) USB 3.0; Configuration 2 - 5V/2A or 12V/1.5A (18W maximum). can charge tablets and laptops; configuration 3 - 5V/2A or 12V/3A (which can provide a maximum power of 36W for large laptops); configuration 4 - 20V/3A (60W) maximum, but Micro-A/B connector only, configuration 5 - 20V/5A (100W) maximum power, TYPE-A/B connector only. The improvement of USB 3.1 power supply and charging application will enable USB 3.1 to unify transmission interface of mobile phones, tablets and computers.

Audio and sound transmission standards

USB 3.1 adds audio and video transmission over USB A/V. Using USB to transfer images is actually very convenient. In addition to a wide range of USB interfaces, it also allows you to save power cord and be powered directly from USB. For example, ASUS MB168B+ 15.6" portable monitor uses a USB 3.0 port to connect to a display, but it only supports up to Full HD level.The new USB AV 3.1 provides 9.8Gbps bandwidth and supports 4K display up to 4096 x 2304 at 30fps.4K display specification is same as HDMI 1.4.B At same time, USB AV also supports HDCP image encryption technology, with a larger power supply.Larger monitors are expected to also be able to display 4K resolution via USB AV 3.1.In addition, existing devices and monitors can transmit audio and video using USB cables. through USB AV adapters If USB AV is popularized, it will definitely bring a lot of convenience to life, and USB cable can also replace other di playing and become most practical audio and video transmission cable.

What are advantages of usb3.1? In general, there are five advantages of new USB3.1. 1. The read and write speed is so fast with ultra-high theoretical bandwidth

The difference between usb3.1 and 3.0, what are advantages of usb3.1?

The theoretical bandwidth of USB3.1 port is 10Gbps. Of course, real speed is definitely far from theoretical value, but this does not prevent us from achieving ultra-high read and write speeds of 800M/s. in test itself.

2. Ultra-thin interface can bring a new wave of ultra-thin portable electronic devices

The difference between usb3.1 and 3.0, what are advantages of usb3.1?

The size of old-fashioned USB port is 1.4 cm long and 0.65 cm wide, which obviously cannot meet increasingly urgent needs of ultra-thin portable electronic devices, especially mobile phone manufacturers, while size of USB3 The .1Type-C is 0.83 cm long and 0.26 cm wide. Clearly, it has reached a new level of frivolity. The mobile phone interface has been upgraded from original Mini USB to Micro USB, which has become standard configuration of all smartphones and indirectly contributed to first wave of ultra-thin smartphones, and now ultra-thin USB3.1 Type-C. it is not difficult to imagine that a new wave of portable electronic devices will cause a wave of "there is no thinner, but thinner wave" in near future.

3. The two-way connection greatly improves user experience.

One of big advantages that USB 3.1 Type-C brings this time around is that two-way plug and play design makes no distinction between positive and negative, greatly improving bad experience of using USB data cables. I believe many Android users will start to sigh and finally be able to charge their phones with their eyes closed.

4. High compatibility and old hardware won't disappear soon

The difference between usb3.1 and 3.0, what are advantages of usb3.1?

We know that USB compatibility has always been good, and this time USB3.1 specification has also inherited it very well. Only one adapter cable is required, and USB3.1 can be easily compatible with USB3.0 and USB2.0 devices. However, to ensure smooth operation, author still recommends updating USB2.

5. Increased power output ensures fast charging

According to USB3.1 specification, interface can provide a maximum power supply of 5V 20A or 100W. Take ASUS B85M-G PLUS motherboard as an example. The current open power supply is 5V 3A, although only 15W doesn't seem like much. But you should know that USB3.0 power supply current is only 1A. For devices that support fast charging, 3A is undoubtedly a big boon, it's great to think about triple charging speed.

With regard to promotion and development of USB3.1 technology, mobile device manufacturers, especially mobile phone manufacturers, have always been interested in this, but it seems that this is just superficial. Various mobile phones and auxiliary lines claiming to adopt USB3.1 technology Type-C Its data transfer rate and power supply have not improved qualitatively. Really, manufacturers of storage systems and motherboards, representatives of Kingston, SanDisk, ASUS and MSI contribute to development and popularization of USB3.1 technology. During recent assessment of ASUS B85M-G PLUS, ASUS motherboard made a very deep impression on author. CrystalDiskMark Test Read: 686.4 MB/s, Write: 799.7 MB/s The results allow author to see true power of USB3.1.

What are benefits of usb3.1 for mobile phones? Let mobile phones charge faster

Because power standard has been upgraded to 20V/5A and 100W, USB 3.1 can greatly improve device charging speeds and also power more powerful devices such as laptops, projectors, and even TVs. Why Apple's new MacBook only needs built-in USB Type C to meet power and data requirements.

Higher data rate

Because USB 3.1 supports data transfer rates up to 10Gbps, it will greatly improve data transfer rate of mobile phones, which is very beneficial for development of mobile phones. For example, more and more mobile phones are starting to support 4K video recording, video files are getting larger, and higher data rates are needed.

Display support

HDMI is currently interface standard commonly used in TVs and monitors. Although there is a mini version, no mobile phone has a built-in interface as it increases cost and increases volume. And since USB 3.1 supports youinput to display, it is more suitable as an output interface for mobile devices, especially for reversible Type-C.


Obviously, for smaller devices such as mobile phones and tablets, a universal universal interface is needed, which can greatly improve connectivity of devices. From current perspective, Type-C in USB 3.1 is likely to become connectivity standard in future, providing integrated connectivity solutions such as data transfer, peripheral connectivity, and display output.