Difference Between USB 2.0 & USB 3.0

 Universal Serial Bus (USB) tools and ports allow you to connect computer inputs to your computers, keyboards, external hard drives, or storage keys.

The numbers following the USB signal simply correspond to the standard USB standard, series 3.0 and 3.1 being the most recent at the time of writing these lines.

In addition to the color of their connectors (version 3.0 is usually blue), it is the data transfer speed that is the main difference between the two standards.

Thus, the standard of USB 2.0, introduced in 2000, made it possible to ensure that the transfer speed was much higher than at the previous level: from 1.5 MB per second to 60 MB of theory! USB 3.0, which appeared in 2008, doubled the transmission rate by 10, reaching a maximum of 625 MB per second!

Note, if the reverse interaction is supported in the case of USB 3.0 jack (i.e., your device with a USB 3.0 port will run on your computer with USB 2.0 sockets), the transmission speed will remain restricted to 2.0 levels ...

USB rates. In early 1995, the USB standard was developed for connecting various devices.

USB 1.0 standard offers two types of communication:

12 Mb / s in speed mode.

1.5 Mb / s at low speed.

USB 1.1 standard provides specific specifications for USB device manufacturers but does not change the bit rate.

USB 2.0 standard provides speeds of up to 480 Mbit / s.

USB 3.0 standard offers speeds of up to 4.8 Gbps.

If there is no logo the best way to find out if these are USB devices at low or high speeds to view product labels as long as the connectors are the same.

Interaction between USB 1.0, 1.1 and 2.0 devices is guaranteed. However, using a USB 2.0 device in a low-speed USB port (eg 1.0 or 1.1) will limit the bit rate to 12 Mbps. In addition, the application may display a message stating that the flow will be blocked.

USB port:

There are two types of USB connectors:

Type A connectors, which are rectangular and used for low-bandwidth devices (keyboard, mouse, web camera, etc.);

Type B connectors, which have a square shape and are used for high-speed devices (hard hard external, etc.).

Definition: USB Type A and Type B connectors

1. Power + 5V (VBUS) 100mA maximum

Data (D-)

Data (D +)

Mass (GND)

USB bus operation

USB tethering has a power supply feature for connections, up to 15 W per device. It uses a cable that consists of four cables (ground GND, VBUS power supply and two data cables called D- and D +).

Description: USB cable

USB standard allows it to be tied to devices, using a bus or star. Devices can then be connected sequentially, or by branch.

Branching is done using boxes called "hubs", with one input and a few effects. Some are active (provide electricity), some are inactive (computer-enabled).

Definition: The topology of the USB port bus

Description: Starter for USB ports

The connection between the host (computer) and the parameters is done according to the rule of thumb (communication language) based on the principle of the token ring. This means that bandwidth is temporarily shared between all connected devices. The host (computer) sends the first signal in a series of milliseconds (ms), a period of time during which it will give a "speech" to each of them. When the host wants to communicate with the device, it sends a token (data packet, containing the address of the device, embedded in 7 bits) that identifies the device, so the administrator holds the "dialogue" by the parameters. If the device sees its address in the token, it sends a data packet (8 to 255 bytes) in response, if not, it transfers the packet to other connected devices. The data exchanged was encrypted according to the NRZI encoding.

Since the address contains 7-bit codes, 128 devices (2 ^ 7) can be connected simultaneously to the port of this type.

I think I have covered all the information related to USB 2.0 and USB 3.0. If you have any questions then comment so I can erase your thought. Feel free to share your experience with USB 2.0 and USB 3.0