USB- types of transferring the data

A USB is the extension of the motherboard for connecting the several external devices. The external device may be an external modem, scanner, flash drives, MP3 players, printers, mobile phones, etc.  

Using of a can USB converter has become the mostly used and very cost effective methods of connecting different types of devices. It has become a part of everybody’s lives really quickly as it had originated back only in the mid 1990s.

The full form of USB is Universal serial Bus and it has been with us since many decades now. It is a widely used cables all our personal computers. External hard drives, Web cameras, memory sticks, all are interfaced over the can USB.

It is a practice where in the USB host (which is the PC in most cases) will initiate the transmission and the device (for example, a USB speaker) will respond to it. Every transmission is dealt with a particular device, and to a specific endpoint on the device.  In-transfers are the process of sending the data to the PC. Out- transfers transmit data to the device.

There are four basic types of In and Out transfers in a Can USB Converter:

• Bulk transfer

This type of transmission is used to constantly move the data between host and the device. All Can USB cables carry a CRC which is supposed to indicate if an error has occurred. In the process of bulk transfer, the data receiver needs to verify the CRC. If it is the correct CRC, the transfer is acknowledged and assumed to have happened error free. With the incorrect CRC, the transmission will not be a success.

• Isochronous transfer

Isochronous transfers are meant for transmitting the data in real time between the host and device. An endpoint is set by the host, the host assigns a specific bandwidth to that endpoint and regularly carries out the in and out transfer at that end point.

• Interrupt transfer

Hosts make use of Interrupt transfers to frequently poll the device and find out if something worthwhile has occurred. The name ‘interrupt’ transfer is a bit confusing as this does not interrupt anything.

• Control transfer

Control transfers function more or less like bulk transfer. These are mostly used for operations that are outside normal data flow. All the transmissions are made in Serial to USB frames. USB cables are therefore extremely usable, durable and having a large popularity. It makes the moving of big files an easier and a simpler process.