Home General Knowledge GK SPECIAL TOPIC : BLUETOOTH TECHNOLOGY
GK SPECIAL TOPIC : BLUETOOTH TECHNOLOGY
Friday, 18 July 2014 08:14




BLUETOOTH TECHNOLOGY

Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances (using short wavelength radio transmissions in the ISM band from 2400-2480 MHz) from fixed and mobile devices, creating Personal Area Networks (PANs) with high levels of security.

There are two important parameters of Bluetooth devices - class and supported profiles.

"Class" signifies the distance at which a Bluetooth connection is possible. Most mobile devices are Class 2, which means they have a range of up to 10 m. Class 1 devices are rare and have a range of up to 100 feet.

A "profile" is a type of Bluetooth connection. The most common are the Headset (HSP) and Hands free (HFP) profiles that enable the device to connect to a wireless headset or hands free.

Bluetooth technology was designed primarily to support simple wireless networking of personal consumer devices and peripherals, including cell phones, PDAs, and wireless headsets. Wireless signals transmitted with Bluetooth cover short distances, typically up to 30 feet (10 meters). Bluetooth devices generally communicate at less than 1 Mbps.

List of applications

* Wireless control of and communication between a mobile phone and a hands free headset

 

* Wireless Bluetooth headset and Intercom.

 

* Wireless networking between PCs in a confined space and where little bandwidth is required.

 

* Wireless communication with PC input and output devices, the most common being the mouse, keyboard and printer.

 

* Transfer of files, contact details, calendar appointments, and reminders between devices with OBEX.

 

* Replacement of traditional wired serial communications in test equipment, GPS receivers, medical equipment, bar code scanners, and traffic control devices.

 

* For low bandwidth applications where higher USB bandwidth is not required and cable-free connection desired.

 

* Sending small advertisements from Bluetooth-enabled advertising hoardings to other, discoverable, Bluetooth devices.

 

* Wireless bridge between two Industrial Ethernet (e.g., PROFINET) networks.

 

* Dial-up internet access on personal computers or PDAs using a data-capable mobile phone as a wireless modem.

 

* Short range transmission of health sensor data from medical devices to mobile phone, set-top box or dedicated tele-health devices.

 

* Allowing a DECT phone to ring and answer calls on behalf of a nearby cell phone

 

* Real-time location systems (RTLS), are used to track and identify the location of objects in real-time using “Nodes” or “tags” attached to, or embedded in the objects tracked, and “Readers” that receive and process the wireless signals from these tags to determine their locations

 

* Personal security application on mobile phones for prevention of theft or loss of items. The protected item has a Bluetooth marker (e.g. a tag) that is in constant communication with the phone. If the connection is broken (the marker is out of range of the phone) then an alarm is raised. This can also be used as a man overboard alarm. A product using this technology has been available since 200