USB 3.0, an extension to USB 2.0 [Universal Serial Bus] introduced was introduced in 2008 after 8 years of launch of USB 2.0 in 2000.
USB is an Industry standard developed in Mid 90's that defines the Connectors, Cables and Communications protocols used in a bus for connection, communication and power supply between computers and electronic devices. Nowadays , USB is widely used to Transfer data , Recharge devices , and almost of sort of computer attachable devices are available with USB connectivity.
USB is an Industry standard developed in Mid 90's that defines the Connectors, Cables and Communications protocols used in a bus for connection, communication and power supply between computers and electronic devices. Nowadays , USB is widely used to Transfer data , Recharge devices , and almost of sort of computer attachable devices are available with USB connectivity.
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| USB 3.0 with SupersSpeed and A,B Connectors |
USB 3.0 Features
- USB 3.0 can attain speeds upto 5Gbps with its new "SuperSpeed" technology while USB 2.0 has top transfer rate of around 480Mbps.
- USB 3.0 can automatically identify when device is Idle and further can decrease the power supply. Hence, USB 3.0 is more power efficient.
- As the number of wires get doubles in USB 3.0 , the amount of power it can deliver will also go high. USB 3.0 can deliver 900mA supply as comapred to 500mA of USB 2.0 and Hence, more devices can get connected to same USB hub.
- USB 3.0 can asynchronously identify the state of device and start communication when device is ready . Therefore with the use of NRDY and ERDY packets the bus utilization of USB 3.0 is much more effective then 2.0 .
- USB 3.0 is backward compatible and all previous USB 2.0 hosts can respond to USB 3.0 devices normally But, the speed is limited to 480Mbps in case .
Physical Differences
- USB 3.0 has 8 channel Bus as comapred to USB 2.0 4 channel bus.
- With the increase in data channels, different B type of connectors are needed for 3.0 communication. There are 2 varient of USB 3.0 B type connector , One is standard and another as Micro.
- USB 3.0 connectors are blue coded while USB 2.0 are silver to uniquely identify them by watching them physically.