mobile phones and networks

8/3/2019 Mobile Phones and Networks

1/21

Mobile phones and networks

Milinkovi Miljan Renduli DejanMilovanovi Nikola Pjevovi Uro

Negovanovi Luka


2/21

We will present you some basic information about: Mobile phones and networks.

Mobile phones and driving safety.

Mobile phones radiation and health.


3/21

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.


4/21

Mobile phone

history


5/21

1973 the first mobile phone.

1984

available to the public.

1988

Big company' s startedto make mobile phones.


6/21

Mobile phone components


7/21

The circuit board.

A battery.

Keypad.


8/21

Display.

The antenna.

The speaker and microphone.

SIM Card.


9/21

Mobile networkgenerations


10/21

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.


11/21

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.


12/21

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.


13/21

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.


14/21

Mobile phone.

..and driving safety


15/21

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.


16/21

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.


17/21

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.


18/21

Mobile phone can cause

slightly raised blood pressure

at the time of use.

Mobile phone can cause mildfatigue after prolonged use.


19/21

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.


20/21

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.


21/21

mobile phones and networks

Documents