Q. What is a short range wireless communication technology called?
- LTE
- Bluetooth
- Fiber Optic
- Wi-Fi
Correct Answer: Option (b)
Explanation:
Bluetooth is a widely used technology for short-range communication enabling exchange of data over distances up to 10m. The 2.4 GHz ISM (Industrial, Scientific, and Medical) band is reserved for this technology. This band is available globally and is license-free. What sets this technology apart from other wireless technologies is its capability of transferring data over short-ranges without interference.
Although, other options like (d) and (a) might also seem correct, but in the question it has been stated technology for ‘short range’ communication.
By using bluetooth technology, devices typically can communicate with devices in the range of 10m with some class A devices reaching up to 100 metres. This technology is also classified under the range of low-power consumption. It uses around 1 milliwatt of power for communication with other devices over wireless networks.
Another factor that is of importance in this technology is its architecture. It utilizes peer-to-peer architecture for connecting with other devices. This means that there is no intermediate infrastructure, such as access points or routers, required for connection with other devices. This thing makes technology highly versatile and increases its usability in sectors such as industrial automation, automotive systems, and healthcare applications.
Security is also taken care of in bluetooth. The data transmitted over bluetooth connection is encrypted and can also be configured to use authentication for establishing connection. This makes it secure from eavesdropping and makes it compatible for personal data transfer over short-ranges.
The idea for bluetooth was conceived in 1994 as a wireless alternative for RS-232 cables for communication over short-ranges. The first commercial product utilizing this technology was launched in the year 2000 which was a hands-free mobile headset. Presently, this technology is being integrated into everything from smartphones, smartwatches, cars, and gaming consoles to industry level IoT sensors.