USB 3.0HUB

USB3.0 HUB is commonly known as usb3.0 splitter, also known as usb3.0 hub, usb3.0 is relative to usb2.0, the highest transmission rate of USB2.0 is 480Mbps, that is, 60MB/s.

Definition

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 of bandwidth. If a single device occupies all the bandwidth of the usb interface, it will bring difficulties to the use of other devices. The highest transmission rate of usb3.0 is 4.8Gb per second, which is 10 times higher than usb2.0. The usb3.0 splitter is a device that can convert one USB interface into multiple (usually 4) and use these interfaces at the same time. And the speed is 10 times faster than usb2.0 splitter.

Introduction

The USB3.0 interface standard has been around for half a year, and the USB3.0hub has also been introduced. USB3.0hub is the USB3.0 splitter.

Everyone noticed that there is no interface for the USB3.0 splitter. Its interface is different from the USB2.0. The USB2.0 data line has only one interface, while the 3.0 has two interfaces. Such an interface is dedicated Designed for usb3.0, its running speed is also greatly improved. However, with the advent of USB3.0, it will inevitably impact the original industrial structure. Some manufacturers have successively launched their first USB3.0 products, winning attention. It is not difficult to see the presence of USB3.0 and 2.0 from some technical information topics, and the topics surrounding the two are also constantly intensifying. On the Huaqiang Electronic Network, there is also a Weibo topic debate about USB3.0 and USB2.0. According to the published Weibo, there are not a few who are optimistic about USB2.0.

Feature

1.USB 3.0, what a popular word! The USB 3.0 interface standard was only announced in November 2008. It has been less than 3 years since there have been a large number of USB 3.0 products on the market: USB 3.0 motherboards, USB 3.0 mobile hard drives, USB 3.0 flash drives, USB 3.0 card readers, USB 3.0.

2.According to the media, the transfer speed of USB 3.0 is 4.8Gbps, ten times that of USB 2.0. Yes, it is G-level, but this is a bit, not a byte. Just like you pull a 4Mbps network cable, the actual download speed can only reach 512KB/S. Because 8 bits = 1 byte, that is, 4.8Gbps=600MB/S, which is still a theoretical value.USB 3.0 interface on the motherboard, USB 3.0 motherboard, you can often see this USB 3.0 master chip D720200F1.

3.600MB/S, really fast. But to achieve this speed, these two bottlenecks must be broken: motherboard interface and storage medium. You rushed to the Computer City, bought a USB 3.0 mobile hard drive and tried it back, and found that the speed is still USB 2.0. This bottleneck is probably due to the motherboard interface. USB 3.0 motherboards, although various manufacturers have launched them, because Intel currently does not integrate a USB 3.0 host controller in its chipset, USB 3.0 motherboards are not yet popular and relatively expensive. The so-called USB 3.0 motherboards you see now are all transitional products, and most of them bridge two blue USB 3.0 ports through a third-party USB 3.0 master chip. PS: If your desktop motherboard does not have a USB 3.0 interface, but there is still a free PCI-E slot, you only need to buy a PCI-E to USB 3.0 adapter card; for notebooks, buy a PCMCIA to USB A 3.0 expansion card (USB 3.0 ExpressCard) will do.

4.Even if it comes out of the motherboard with a USB 3.0 interface, the mobile hard disk used is also USB 3.0, can the actual transmission speed reach 600MB/S? Photo Steak can tell you with certainty: No show at the moment! Limited by the mechanical structure of the hard disk, the internal transmission speed of the mainstream 3.5-inch 7200 rpm 500G hard disk will not exceed 150MB/S, and the internal transmission speed of the 2.5-inch 5400 rpm 500G mobile hard disk is lower. I used a 120G mobile hard drive with USB 3.0 interface to test on a host equipped with Gigabyte G41 motherboard, Pentium E5800 CPU, DDR3 1333 2G memory, and USB 3.0 Express Card. ATTO showed that the read and write speeds were only 45MB. /S and 47MB/S (the bottleneck has appeared in the hard disk, which is the transmission speed of the hard disk). Of course, some people can buy an SSD solid state drive to try, the speed will be much faster (the new SSD, its read and write speed has reached 500MB/S).

New technology

Provides a higher transmission speed of 4.8Gb/s

· Provides better support for devices that require greater power support, maximizing the power supply of the bus

· Added new power management functions

·Full-duplex data communication provides faster transmission speed

· Backward compatible with USB 2.0 devices