Wednesday, 9th May 2012
Bluetooth >>> this is a very familiar word among
youngster. We use it whenever we want to transfer media like songs and pictures
between mobile phones.
So,
the function of Bluetooth
is to connect and exchange information between devices such as mobile phones, laptops, PCs, printers, digital
cameras and video game consoles
over a secure, globally unlicensed short-range radio frequency. Similarly,
we need to know how the data transfer through Bluetooth and what are the
devices used in the transfer.
Transfer of Data using Bluetooth
Basically, Bluetooth
technology use radio wave to transmit data and it follows the IEEE 802.15
standard. The technology that enables it to transmit data with lesser problems
caused by interference is Spread-spectrum Frequency Hopping technology. This
technology enables the data transfer occurs on unlicensed 2.4 GHz (Industrial, Scientific and
Medical) frequency band that is shared among other devices (microwave ovens,
cordless phones, garage door openers, etc. ) and hence, avoiding
the interference with other devices.
On the other hand, the
speed of the data transmission is the same when there are more than one user
using Bluetooth technology to transfer data at the same time. Unlike Wi-Fi,
when there are many users using Wi-Fi at the same time, the speed of data transmission
is definitely slower.
Before the client (the sender) transfers a media (data) to the server (other bluetooth enabled devices), the client has to send a request to the server. Then, the server has to receive the data transfer from the client in order to initiate the transfer of data.
The data transfer through Bluetooth consume only a little amount of energy as compared to cellphone. Bluetooth transfer emit only 1 miliwatt of signal whereas cellphone emit 3 milliwatt. However, one of the advantages of bluetooth transfer is that it can tranmit data although there is barrier like walls.
Before the client (the sender) transfers a media (data) to the server (other bluetooth enabled devices), the client has to send a request to the server. Then, the server has to receive the data transfer from the client in order to initiate the transfer of data.
The data transfer through Bluetooth consume only a little amount of energy as compared to cellphone. Bluetooth transfer emit only 1 miliwatt of signal whereas cellphone emit 3 milliwatt. However, one of the advantages of bluetooth transfer is that it can tranmit data although there is barrier like walls.
The
Devices Used
In order to connect
with other Bluetooth enabled devices, every device no matter the client or the server
has to associate with a transceiver microchips, either build in (eg. Bluetooth
card) or connect externally (eg. Bluetooth USB Dongle).
-
Devices build-in with transceiver
microchips which function as transferring and receiving devices.
OR
- External Bluetooth device called Bluetooth
dongle for those devices that do not have build-in transceiver.
 |
| ^^ Bluetooth Microchip |
 |
| ^^ Bluetooth Dongle |
Drawbacks of Using Bluetooth to Transfer Data
- Distance covered is limited within 10m
- Speed of transferring data is slowest
(1Mbps) when it compared to Infrared (4Mbps) and Wi-Fi (11Mbps – 54Mbps)
The
Future of Bluetooth
Bluetooth technology
is expected to stay strong in the future because Windows and Mac OS continue
their native support for it. Besides, there are also many emerging features
such as Bluetooth in cars; automatic configuration of Piconets; and Quality of
Service (QoS) improvements which shows its potential to be used widely in the
future.
Broadband
Broadband is a technology that transmits data faster than Bluetooth.
Band refers to the bandwidth which means the amount of data that can be sent
from one computer to another through a particular connection in a certain
amount of time; thus, broadband means that this technology is able to transmit
more data and at a higher speed than narrowed frequencies (eg. Bluetooth).
Data transmission using broadband is more effective than Bluetooth
because it can carry multiple media such as voice, video or other data at once
with different channels. These channels are taking different frequencies or specific
time slot to avoid interference occur. Examples of broadband technologies are
broadcast television, cable television, microwave, satellite, wireless phones
and others. To make it clear, let’s take cable television as an example. Cable
television is able to carry 30 or more TV channels just like broadband.
Infrared
Infrared technology
transmits data slower than broadband but faster than Bluetooth. The maximum
amount of data that can be carried through infrared is 4Mb.
To understand the
data transfer through infrared, let’s use remote control as an example.
Basically, remote control
use a particular wavelength to communicate with the device that it command.
When there is an instruction from the remote control, its transmitter sends out
infrared light in the form of pulses to the device that is commanded by it.
Then, the pulses are translated into binary codes which represent its command.
At this moment, the remote control must be placed in front of the commanded
device in order to transmit data in the line of sight. Later on, the commanded device receives these
pulses of light and decodes them into binary data, which is understood by the
microprocessor inside it.
That's all from me. Thanks!
