Gist of Science Reporter
Ans. Bluetooth is a
short-range wireless technology that allows computers, phone and other devices
to talk to each other over short distances (up to 100 meters). Bluetooth uses
radio waves (in the 2.4 Gigahertz range) and is designed to be a secure and
inexpensive way of connecting and exchanging information between devices such as
mobile phones, laptops, PC’s, PDAs, printers, digital cameras, mouse and
keyboards. Wi-Fi networks and Bluetooth are the wireless hotspots in today’s
time and are almost 20 times faster than the earlier versions. With the latest
technology of Bluetooth (version 2.0), devices can hence achieve data transfer
speeds up to 2 or 3 Mbps (megabits per second).
Why the name Bluetooth? The name comes from the ancient King
Harald Blatan of Demark (Blatan in Danish translates to “blue tooth” in
English). Sweden-based telecom company Ericsson developed the technology and was
cofounder in 1998 of the Bluetooth Special Interest Group Governing body (www.bluetooth.com).
Bluetooth is also standardized as an IEEE wireless personal area network.
Q. What is Global Positioning System?
Ans. Global Positioning
System, or GPS, is one of the most widely used technologies in the communication
world. GPS navigational systems are supported by a network of 27 satellites,
which orbits the Earth in acyclic pattern every twenty four hours. At any given
time, signals from a minimum of four satellites are accessible to any one point
on Earth. Whenever a receiver device is activated, radio waves are sent out. A
receiver’s exact location is determined through a process called triangulation
where three satellites work together to track down possible location points,
while a fourth satellite compiles the data ad picks out the exact location.
calculations are made based on how long it takes the radio signals to travel
back and forth between the receiver and the satellites.
A GPS tracking system uses the Global Navigation Satellite
System (GNSS) network. This network includes a range of satellites that uses
microwave signals that are being transmitted to GPS devices to give information
on location, vehicle speed, time and direction. So, a GPS tracking system has a
potential to provide the real time and past navigation data on any kind of
journey. Location tracking by providers in case of an emergency and giving
navigation directions are other uses of this technology in mobile phones. A
mobile phone also work like a two-way radio when communicating with the cell
phone towers and the GPS capability of phones simply extends the radio signals
to reach out to the space satellites.
The receiver device can be located inside the phone itself,
or the user can use a wireless connection like a Bluetooth connection. Mobile
phones work on Java-based programs and have database access to their provider’s
system. The mapping capabilities are displayed on the phone’s screen via the
cellular provider’s database. The accuracy of these maps depends on how
frequently your provider updates the database.
Q. What do you understand by IMEI Number?
Ans. IMEI Number is
something all mobile users should be aware of. IMEI is the acronym for
International Mobile Equipment Identity. This code is a unique number associated
with every mobile phone and can help us to find our stolen cell phone easily. We
can find our mobile phone’s IMEI number by dialing the sequence *#06# into the
phone. The unique 15-digit IMEI code of the mobile phone will be displayed
instantly. Note this number down and keep it in a secure place so that you can
find it in case your phonies misplaced or stolen. You can also find the IMEI
number by checking themetallic plate under the battery, after making sure that
power is switched off. In case your mobile phone gets lost or stolen, you can
inform yours network provider who can then put the IMEI number on a shared
database. This will prevent that particular phone from being registered on any
network. Thus, it will be useless for a thief even if the mobile phone’s SIM
card is changed. And then, by the use of GPS, the phones could be tracked. This
IMEI number is also required to unlock the mobile phone and get it working once
it is found.
In case your mobile phone doesn’t have the IMEI number then
you are in trouble! The Department of Telecom (DOT), Ministry of Communications
and Information Technology, Government of India has direct cell phone operators
to disconnect mobile phone handsets without legitimate International Mobile
Equipment Identify (IMEI) number from 1 December 2009. This has been done to
counter threats to national security, as many crimes have been aided by phones
that cannot be easily tracked. So check that cannot be easily tracked. So check
your cell phone and replace it if it does not have a proper IMEI number to
prevent misuse of your phone.