USB HUB
USB Hub refers to a device that can expand one USB interface into multiple and use these interfaces at the same time. USB HUB can be divided into USB2.0 HUB, USB3.0 HUB and USB3.1 HUB according to its USB protocol.
Content
Strucuture
Classification
Instructions
Common problems
Structure
First of all, the term is divided into two parts: USB and hub
First, USB is the abbreviation of Universal SerialBus in English, and "Universal Serial Bus" in Chinese, also known as Universal Serial Interface.
Second, Hub is a hub that everyone often talks about. It uses a star topology to connect multiple USB interface devices.
USB Hub, can be connected to computer desk lamp, computer fan, MP3, U disk, voice recorder, digital camera, etc.
* One USB interface can be expanded into multiple independent working USB interfaces.
* Adopt the second generation USB HUB controller
* Directly connected to the computer, no need for external power supply, easy to use
* The computer automatically recognizes and installs, no driver is required, plug and play, plug and play freely
* Support USB2.0, speed up to 480Mbps, backward compatible with USB1.1
* Built-in current overload short-circuit protection device
* System support: Win95/98/Me/2000/XP, Linux2.4andMac os8.5 or above.
Classification
USB2.0 HUB supports USB2.0, the theoretical bandwidth is up to 480Mbps;
USB3.0 HUB supports USB3.0, backward compatible with USB2.0/1.1, theoretical bandwidth up to 5Gbps;
USB3.1 HUB supports USB3.1, backward compatible with USB3.0/2.0/1.1, theoretical bandwidth up to 10Gbps
Instructions
1. USB-HUB is a device that provides extended communication. If the Hub can drive a 2.5-inch mobile hard drive when the external power supply is not connected, it mainly depends on the power supply capacity of the computer expansion port.
2. Generally the 2.5-inch mobile hard disk needs to be powered by the computer or Hub, and the 3.5-inch mobile hard disk needs to be equipped with a high-power dedicated power supply; please do not directly connect this type of equipment;
3. Without external power supply: The current provided by a computer USB port is about 500MA, which can barely be enough for a 2.5-inch mobile hard disk, and part of it through the USB-Hub is not enough for ordinary 2.5-inch mobile hard disks. of.
4. For the front USB ports of many compatible machine cases, the power supply capacity is even worse due to one more adapter and material problems such as wires; it is very easy to cause the mobile hard disk to be unusable or even lose data and damage the hard disk;
5. If your mobile hard drive makes a "click" sound, it is caused by insufficient power supply; for your mobile hard drive, it is recommended to connect the USB-Hub to the integrated USB port on the motherboard on the back of the chassis to ensure better Contact and power supply.
6. When using the mobile hard disk, please use the original USB power supply line. Ordinary usb cable, with small diameter and large loss, cannot meet the power supply needs.
Common problems
Slow down
Under the vista operating system, plug in the USB Hub (with 4 ports) and the U disk, the computer prompts can speed up, can the speed be increased?
USB-Hub is just a tool for extending the USB interface. To put it bluntly, it is just an interface expansion tool. In fact, the use of USB-Hub can only slow down the speed of the USB device, and it is absolutely impossible to make it faster. The best way is to connect the USB device directly to the USB port of the computer instead of connecting it through the USB-Hub. Especially for mobile hard drives, don't try to use USB-Hub to connect easily, it will even damage your mobile hard drive's life.
You don't need to pay attention to the prompt, because it is likely that the USB-Hub power supply is insufficient. Even if it is changed to another socket, it will not work better. In addition, don't connect a mobile hard disk to the USB-Hub. Some, such as a camera, are more suitable to connect to the USB-Hub. Do not connect too many devices to the USB-Hub, it is best to connect directly to the computer.
Mobile Hard disk
Question: The mobile hard disk connected to the USB Hub cannot be used
Answer: Simply put, the power supply of the mobile hard disk is insufficient. The mobile hard disk is powered by USB, and the mobile hard disk generally uses a notebook hard disk, with 0.5A-1A. The smaller the current, the lower the requirement for USB power supply, and vice versa. The USB Hub itself has no power supply, it borrows the 5V power from the motherboard USB. You know it. If you don’t recognize it, the power supply is insufficient. You can use it by plugging the mobile hard disk directly into the motherboard.
You can choose a hard disk with a small working current as much as possible, and then buy a USB Hub for a good-quality notebook, and the problem will be more than half solved.