Download - Mobile Phones and Networks
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Mobile phones and networks
Milinkovi Miljan Renduli DejanMilovanovi Nikola Pjevovi Uro
Negovanovi Luka
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We will present you some basic information about: Mobile phones and networks.
Mobile phones and driving safety.
Mobile phones radiation and health.
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Mobile phones Mobile phones, also known as
cellular phones or wireless phones,
are hand-held phones with built-in
antennas.
Unlike home phones, mobilephones can be carried from
place to place.
This makes them a good choicefor people who want to be in
touch with other people even
when they are away from the house.
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Mobile phone
history
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1973 the first mobile phone.
1984
available to the public.
1988
Big company' s startedto make mobile phones.
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Mobile phone components
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The circuit board.
A battery.
Keypad.
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Display.
The antenna.
The speaker and microphone.
SIM Card.
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Mobile networkgenerations
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1G network
First generation of mobile networks.
Launched in Japan in 1979.
Analogue signals.
Brick-sized phones.
Voice traffic only.
No inter-network roaming possible. Standards: AMPS, TACS, NMT.
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2G network
Second generation of mobile networks.
Launched in Finland in 1991.
Digital signals.
SMS text messages.
Voice services and low data transmission.
Secure air interface. Standards: GSM, IS-95, PDC and iDEN.
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3G network
Third generation of mobile networks
Launched in Japan in 2001.
Fast comunication, clarity of voice.
Internet, mobile tv, video
conferencing.
Video calls, MMS, 3D gaming.
Standards: UMTS, CDMA2000 and TD-SCDMA.
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4G network
The forth generation of
mobile network.
Expected to provide mobile
broadband solution to all
mobile devices.
New revolution for the mobile
phone industry and the users.
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Mobile phone.
..and driving safety
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Mobile phone use while
driving is dangerous.
Hands-free phone does notsignificantly reduce the risks.
Drivers generally react slower
when using a mobile phone.
Drivers are more likely to wander
out of their lane when they are
using a mobile phone.
Drivers tend to spend lesstime checking what is going on
around them.
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Safe driving tips for using a mobile phone:
Never read or send text
messages while driving.
Use voicemail instead of answering
your phone while driving.
Pull over safely and park
to make or receive a call.
Plan breaks for phone calls. Never look up phone
numbers while driving.
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Mobile phone and health
Mobile phone radiation is
the subject of recent interest
and study.
Part of the radio waves are
absorbed by the human head.
Increased risk of tumor if
used one hour per day.
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Mobile phone can cause
slightly raised blood pressure
at the time of use.
Mobile phone can cause mildfatigue after prolonged use.
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Here are some steps you cantaketo minimize the
effects of mobile phoneradiationexposure:
Use hands-free to decrease the radiation to the head.
Keep the mobile phone away from the body.
Limit use to essential calls and keep calls short.
Children should be allowed to use the mobile phone in cases ofemergency only.
Do not use the mobile phone in enclosed metal spaces such as
vehicles or elevators.
Purchase a phone with a low SAR (Specific Absorption Rate).
Take nutritional supplements, particularly anti-oxidants.
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Conclusion
Mobile phones are a vast improvement over the
telecommunicationstechnology ofthe past, and are
daily becoming a fixture of modern life.
As always,communication is vital, and mobile
phones will help us to better communicatewiththe
keypeople in our life.
Using a mobile phone is one of the first steps we
must take to participateeffectively in the emerging
global economy.
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