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Telecom Engineering

Tehseen Hussain

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Telecomm. Definition

Transmission of signals over a distance for thepurpose of communication.

The word telecommunication is adapted from a Frenchword. It is a compound of the Greek prefix tele, meaning

'far off', and communication, meaning 'to transferinformation'.

3 parts:

Transmitter

Medium Receiver

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Who invented the Telephone?

Alexander Graham Bell

(1870s)

More about

Alexander Graham

Bell:

Wife was deaf.

Wanted tocommunicate to herat a distance.

http://www.telcomhistory.org/vm/Images/AGB1867.jpg

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Wireless Technology

Telegraphs and telephones are examples ofwireline, or wire-bound technology, because theyrely on physically connected wires to transmit andreceive signals.

Wireless technology - relies on the atmosphere totransmit and receive signals.

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Wireless Technology

Examples of wireless technology

Mobile Phones

Radios

Televisions

Satellite communications

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Who invented the Mobile phone?

The first handheld mobile cell phonewas demonstrated by Motorolain1973.

the first cell phonecall was made by

Motorola engineer Martin Cooper The first commercial automated

cellular network was launched inJapan by NTTin 1979.

SIM Card

The first SIM card was made in 1991 byMunich smart card maker

http://en.wikipedia.org/wiki/Motorolahttp://en.wikipedia.org/wiki/Nippon_Telegraph_and_Telephonehttp://en.wikipedia.org/wiki/Nippon_Telegraph_and_Telephonehttp://en.wikipedia.org/wiki/Motorola

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Mobile telephony(1G)

The first generation of mobiletelephony (written 1G)operated using analoguecommunications.

AMPS (Advanced MobilePhone System), whichappeared in 1976 in the UnitedStates, was the first cellularnetwork standard.

this first-generation analoguenetwork had weak securitymechanisms which allowedhacking of telephones lines.

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2G

The second generation of mobile networks(written 2G) marked a break with the firstgeneration of cellular telephones by switching fromanalogue to digital.

The main 2G mobile telephony standards are:

GSM(Global System for Mobile communications)

Data rate:

2G-GSM provide SMS & MMS data rate =maximum 9.6 kbps

2.5G- GPRS(General Packet Radio System)data rate=maximum 40 Kbit/s

2.75G- EDGE(Enhanced Data Rates for Global Evolution) =473 Kbit/s

http://en.kioskea.net/contents/gsm.php3http://en.kioskea.net/contents/gsm.php3

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3G

The most important of these characteristics are:

high transmission data rate:

144 Kbps with total coverage for mobile use,

384 Kbps with medium coverage for pedestrian use,

2 Mbps with reduced coverage area for stationary use.

door to multimedia uses such as video transmission,video-conferencing or high-speed internet access.

3.5 G=data rate 8 to 10 Mbps

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Flow of call

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Any Question?

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Thank You