Answer Posted / sj
Bluetooth is an open wireless protocol for exchanging data over short distances from fixed and mobile devices, creating personal area networks (PANs). It was originally conceived as a wireless alternative to RS232 data cables. It can connect several devices, overcoming problems of synchronization
The word Bluetooth is an anglicized version of Old Norse Blátönn or Danish Blåtand, the name of the tenth-century king Harald I of Denmark, who united dissonant Danish tribes into a single kingdom.
The implication is that Bluetooth does the same with communications protocols, uniting them into one universal standard.
The Bluetooth logo is a bind rune merging the Germanic runes (Hagall) and (Berkanan).
[edit]Implementation
Bluetooth uses a radio technology called frequency-hopping spread spectrum, which chops up the data being sent and transmits chunks of it on up to 79 frequencies. In its basic mode, the modulation is Gaussian frequency-shift keying (GFSK). It can achieve a gross data rate of 1 Mb/s. Bluetooth provides a way to connect and exchange information between devices such as mobile phones, telephones, laptops, personal computers, printers, Global Positioning System (GPS) receivers, digital cameras, and video game consoles through a secure, globally unlicensed Industrial, Scientific and Medical (ISM) 2.4 GHz short-range radio frequency bandwidth. The Bluetooth specifications are developed and licensed by the Bluetooth Special Interest Group (SIG). The Bluetooth SIG consists of companies in the areas of telecommunication, computing, networking, and consumer electronics.[4]
[edit]Uses
Bluetooth is a standard and a communications protocol primarily designed for low power consumption, with a short range (power-class-dependent: 1 meter, 10 meters, 100 meters) based on low-cost transceiver microchips in each device.[5] Bluetooth makes it possible for these devices to communicate with each other when they are in range. Because the devices use a radio (broadcast) communications system, they do not have to be in line of sight of each other.[4]
Class Maximum Permitted Power
mW (dBm) Range
(approximate)
Class 1 100 mW (20 dBm) ~100 meters
Class 2 2.5 mW (4 dBm) ~10 meters
Class 3 1 mW (0 dBm) ~1 meter
In most cases the effective range of class 2 devices is extended if they connect to a class 1 transceiver, compared to a pure class 2 network. This is accomplished by the higher sensitivity and transmission power of Class 1 devices.
Version Data Rate
Version 1.2 1 Mbit/s
Version 2.0 + EDR 3 Mbit/s
Bluetooth normal speeds are
120kb - 723kb & 30ft - 300ft
Class 3 devices (eg in most personal computing type devices) have a short 30ft range, high powered Class 1 devices have the longer range, and Class 2 are somewhere in between. Either built in or available as add-on cards.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
explain how bluetooth devices integrate easily with tcp/ip network
Is the slave to slave communication is possible in piconet and if yes then how?
What is Airport?
What kind of encryption will be used for Bluetooth security?
What is bluesnarfing?
What are the difference between power classes in bluetooth?
What companies are involved in the Bluetooth initiative?
How secure is a Bluetooth network?
Can you please explain the difference between power classes in bluetooth?
Explain how data is transferred through bluetooth
What are the uses of bluetooth?
Will other rf devices interfere with bluetooth devices?
Which method is used for Data transfer?
How many devices can communicate concurrently?
what is ldap and its uses?
