What Is Telecom EngineeringTelecom Equipment EngineerBasics Of TelecommunicationTypes Of CommunicationModulationFrequency Spectrum

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Telecommunications engineering, or telecom engineering, is an engineering discipline that brings together electrical engineering with computer science to enhance telecommunication systems.The work ranges from basic circuit design to strategic mass developments. A telecommunication engineer is responsible for designing and overseeing the installation of telecommunications equipment and facilities, such as complex electronic switching systems, copper wire telephone facilities, and fiber optics. Telecommunication engineering also overlaps heavily with broadcast engineering.

What Is Telecom Engineering

A telecom equipment engineer is an electronics engineer that designs equipment such as routers, switches, multiplexers, and other specialized computer/electronics equipment designed to be used in the telecommunication network infrastructure.

Telecom Equipment Engineer

A basic Telecommunication consists of three primary units that are always present in some form.

1)Transmitter

2)Medium

3)Reciever

Basic Of Telecommunication

A Transmitter is a collection of one or more electronic devices or circuits that convert the original source information to inform suitable for transmission over a particularly transmission medium.

Transmitter

There are two types of Medium.1)Unguided MediumWhich includes (Free Space/Air)2)Guided MediumWhich includes : Twisted PairFiber Obtics

Medium

A Reciever is a collection of electronic devices and ckts,that accepts the transmitted signal from the transmission medium and then converts those signals back to the original form.

Reciever

There are three types

1)Simplex2)Half Duplex3)Full Duplex

Types Of Communication

Simplex is a one way communication.

It Means that you can only either send or receive a message or input.

Example: Radio,Remotes etc

Simplex

Its a (Two way Communication).You can send and also receive

msgs.(But one at a time)Example:Walkie Talkie

Half Duplex

It is also a Two way communication.

You can also send or receive msgs both at a time.

Example: Mobile Phones etc.

Full Duplex

Message Signal

Carrier Signal

Signals

Modulation is simply the process of changing one or more properties or parameters of a high frequency Analog Carrier in proportion with low frequency Information Signal(Message Signal).

Modulation

There are various types of modulation,but the following two modulations are widely used.

1)A.m Modulation2)F.m Modulation

Types Of Modulation

Modulation is one of the most important aspect of Telecom Engineering..

It is necessay because if we will transfer only message signal of low frequenies,then we will have to make unpractically large anteenas,which is impossible.

It consumes very less time for the trasformation of signals.

Why Modulation is Necessary

Elf 30Hz to 300HzVF 300Hz to 3KhzVLF 3Khz to 30Khz Lf 30Khz to 300KhzMF 300Khz to 3MHzHF 3MHz to 30MHzVHF 30MHz to 300MhzUHF 300Mhz to3GHzSHF 3Ghz to 30GhzEhf 30GHz to 300GHz

Frequency Spectrum

It includes Ac Power Distribution signal and low Frequency Telementy Signals.

ELF(30Hz to 300Hz)

It includes fequencies generally associated with Human Speech,

Standard Telephone Channels have a 3khz bandwidth

VF(300Hz to 3KHz)

It includes the upper end of human hearing range.

VLF are used for some Govt. and Military system such as Submarine Communications.

VLF(3KHz to 30KHz)

It is used primarily for Marine and Aeronotical Navigation System.

LF(30Khz to 300KHz)

It is used For Commercial AM Broadcasting.

MF(300KHz to 3MHz)

Mostly Two Way Radio Communication use this range.

Amateur Radio and citizen Band use this frequency

HF(3 MHz to 30Mhz)

It is used for Commercial FM Broadcasting and Commercial T.v Broadcasting.

VHF(30Mhz to 300Mhz)

It is used for T.v broadcasting,Land mobile communication and Cellular Telephones.

UHF(300Mhz to 3GHz)

It includes majority of Frequency used for Microwave and Satellite radio Communication Systems.

SHF(3Ghz to 30 GHz)

It is seldom used for Radio Communications and it is accepted in very sophisticated expensive and specialized applications.

EHF(30 GHz to 300GHz)

Thank You