MMC Module 2 Communications Basics Training Manual

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1 MMC [Module Two]

TRAINING MANUAL Communications Basics

Table of Contents

2.1 Mobile Network Technologies ..................................................................................... 2

2.2 Historical Introduction ................................................................................................. 2

2.3 Basic communications system Elements ....................................................................... 4

2.4 Radio transmission techniques .................................................................................... 5

2.5 Structure of cellular network ....................................................................................... 6

2.6 Cell phone network technologies ................................................................................. 6

2.7 SIM card ...................................................................................................................... 7

2.8 IMEI ............................................................................................................................ 8

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TRAINING MANUAL Communications Basics

2.1 Mobile Network Technologies

As a Cell-Phone repair Engineer or technician, all we need is just to have a simple understanding

about cellphones Mobile Networks. We do not need extreme and intimate deeper meaning about

it. That's because what we are going to take around here is to fix what those various mobile

phones company created and build - to make it as simple as that - We are going to fix somewhat

if their product gets busted by the end users who bought it.

Below is just a simple basic information of what we are going to learn.

2.2 Historical Introduction

Telecommunications is the transmission of information through sounds, words, visuals from a

distance.

From ancient to modern times, mankind has been looking for means of long distance

communications (Telecommunication). For centuries, letters proofed to be the most reliable

way to transmit information.

Fire, flags, horns, etc. were used to transmit information faster.

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Telegram: The first wireline communications was the telegraph, invented in the 1844 by

Alexander Graham Bell. The first telegraph message travelled 40 miles. It opened a new

era of long-distance telecommunication.

Telephone: The first successful telephone call by Bell in 1876. When we talk over the

telephone, our voice is converted to electronic signal by the microphone in the handset.

The signal is then transmitted over telephone wires.

1st Generation cellular system (1G): In 1982, the Bell telephone company introduced the

AMPS (Advanced Mobile Phone Service) radio network, thereby deploying the first

cellular network.

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2nd Generation (2G): In 1982 the Conference of European Posts and Telecommunications

(CEPT) created the Group Special Mobile (now known as GSM) and mandated the creation

of a European standard for mobile radio telecommunications in the frequency band

reserved for this purpose. This group produced the GSM standard that is widely deployed

today.

2.3 Basic communications system Elements

Communication system composed of three basic elements: Source, Transmission medium,

Destination.

Source: transmitting antenna. e.g. radio station Antenna.

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Transmission Medium:

Destination: receiver node. e.g. radio.

2.4 Radio transmission techniques

Simplex: communications in one direction only.

e.g. Television, Radio

Half Duplex: two-way communication in the same channel. At any given time a user can

only transmit or receive.

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Full Duplex: Simultaneous two-Way communication. Separate channels are provided for

communication to and from the terminals.

2.5 Structure of cellular network

Cellular network composed of two systems: Switching System, Base station System.

Switching system is responsible for performing call processing and subscriber related

functions.

Base station system performs all the related radio functions.

2.6 Cell phone network technologies

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2.7 SIM card

The Subscriber Identity Module (SIM) is an electronic microchip for storing information includes

subscriber identification, charging, and security.

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Types of SIM cards:

2.8 IMEI

International Mobile Station Equipment Identity (IMEI) is a 15-Digit number that verifies the

mobile equipment is type-approved and not stolen.