Saturday 29 June 2013

BLUETOOTH

BLUETOOTH - A WIRELESS NETWORK


Have you ever thought about the working of Bluetooth, a wonderful networK???
Read this post you will get clear idea about its working..........

WHY IT IS CALLED AS BLUETOOTH???

Bluetooth was named after a king in Denmark "HARALD BLUETOOTH", who got his name because of his fondness for blueberries, which stained his teeth.
He was famous for uniting the warring tribes of Scandinavia, just like our Bluetooth protocol, uniting different technologies.
Hence the name Bluetooth came.

WHAT IS THE NEED FOR BLUETOOTH???

When two devices need to talk with each other either it should have wired connection or wireless connection.
Wired connection increases cabling, cost and complexity.
Compared to wired, wireless is advantageous but it need more power for transmission.
Bluetooth offers a solution to this problem.

GENERATION OF BLUETOOTH:

Now Bluetooth is in its second generation.
First generation Of Bluetooth 1.0 has maximum data transfer speed of 1 Mbps.
Second generation- Bluetooth 2.0 has transfer rate of 3 Mbps.

HOW BLUETOOTH CREATES A CONNECTION???

Bluetooth takes small networking area and keeps transmission power extremely low.
It consumes just 1 milliwatt of power, thereby saving cell phone charges.

HOW BLUETOOTH OPERATES???

It operates in Radio frequency range. Its transmission frequency is 2.45 Gigahertz (actually between 2.402 GHz & 2.480 GHz).
Here you should ask a query... Many devices in our home operate in radio frequency region but Bluetooth doesn't interfere with those gadgets why?
The answer is here, there is more chance of interference yet it won't interfere because of low power consumption. As the transmission power is very low it restricts the usage of Bluetooth within 10 meters (32 feet). So it won't affect any other electronic gadgets.
Bluetooth can connect up to 8 devices simultaneously within 10 meters range.
You should ask another query here...  If many devices turned ON Bluetooth at a time and transfers data, won't they interfere with each other because all are working in same frequency range?
To solve this problem Bluetooth uses a technique called SPREAD-SPECTRUM FREQUENCY HOPPING.
SPREAD-SPECTRUM FREQUENCY HOPPING means jumping of data from one frequency to another.
Not clear....??? When a device transfers data via Bluetooth it will select particular frequency between 2.402 GHz & 2.480 GHz.
If some other device working nearby also took the same frequency data collision may occur.
In order to avoid that Bluetooth keep on jumping from one frequency to another called frequency hopping. (HOP-jump)
By this technique a device can use 79 individual frequencies and it will jump to other frequency 1600 times per second.
Due to this jumping other devices can also use the slice of frequencies without any trouble.
This device reduces collision because it is very rare for any two devices to use the same frequency. If it happens that is also not a problem because every device lasts in particular frequency only for a fraction of second.

SECURITY IN BLUETOOTH:

Usually wireless communication is not safer. Most of the devices grab radio waves in air automatically. But Bluetooth communication is secured one.
Before connecting to any device the Bluetooth will ask for permission to the user else it will ask for code.
After the establishment of connection only it will start transferring data. All these securities are made in software level.
A user can put his device in non-discoverable mode thereby preventing any other devices to identify it.

Bluetooth is a wonderful small network discovered to transfer data with low power... Make use of it....!!!

No comments:

Post a Comment