I had applied for a course for four weeks for which I have given three lectures and now this is my fourth lecture which is the last lecture of this course so I hope you all like this course of mine. If it has come and it has proved to be very useful for all of you, then today is my last lecture, so today my course is being completed, so I hope that you have benefited a lot from this course of mine, then next Insha'Allah Will definitely be back with a new course

So Let's Start:

Data Communication

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Information Communication Data correspondence is a course of moving information electronically starting with one spot then onto the next.

Basic Components Of Communication:

• Message
• Sender
• Receiver
• Transmission Medium
• Encoder and Decoder

1. Message:

The message is the information or data to be conveyed. It might comprise of text, number, picture, sound, video or a mix of these.

2. Sender:

Sender is the device that sends the message. It is also called source or transmitter. The sender can be a computer, fax machine or mobile phone etc.

3. Receiver:

Receiver is the device that receives the message. It is also called sink. The receiver can be a computer, printer, fax machine or mobile phone etc. A computer is usually used as receiver in data communication systems

4. Transmission Medium:

Transmission medium is the way through which the messages are moved. It is also called communication channel. The transmission medium is a physical cable or wireless connection.

5. Encoder and Decoder:

The encoder is a device that converts digital signals in a form that can pass through transmission medium. The decoder is a gadget that changes over the encoded signals into advanced structure.

What Is Signal ?

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A Signal is an electromagnetic or light wave that addresses information. Signs are utilized to move information starting with one gadget then onto the next through a correspondence medium.

Forms of Signals:

• Digital Signal
• Analog Signals

Digital Signals:

The advanced signs are as electrical beats of ON and OFF. These signs are in discrete structure. They give low mistake rate. All information correspondence between the PCs is in computerized structure. PCs comprehend and work just in computerized structure. The accompanying figure addresses a high voltage as a 1 and a low voltage as a 0.

Analog Signals:

Simple sign is a persistent electrical sign as wave. The wave is known as transporter wave. Phone line is most regularly utilized media for simple transmission of information. Light, sound, radio and microwave are also examples of analog signals.

Characteristics of Analog Signals:

Frequency:

The occasions a wave continues during a particular time stretch is known as recurrence.

Amplitude:

The tallness of wave inside a given timeframe is known as plentifulness.

Different Data Types

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1. Text:

Text data consists of words, sentences and paragraphs. Examples some examples of text data are Usman Khalil, Pakistan, Islam etc.

2. Numeric Data:

It may also contain decimal point * plus sing "+" or negative sign "-". The use of "+" with positive numbers is optional. Examples 10, +5,-12, 13.7, -32.5 etc.

3. Image:

This type of data includes chart, graph, pictures and drawings. This form of data is more comprehensive. The bits are packed as bytes.

4. Audio:

Sound is a representation of audio.

5. Video:

Video is a bunch of full movement pictures played at a rapid video is utilized to show activities and developments.

How is data represented in computer?

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Computer works with binary numbers, Binary number may be 0 or 1. The paired digit 1 demonstrates the presence of electrical heartbeat. The paired digit 0 demonstrates the shortfall of electrical heartbeat. The binary digit is known as bit. It is an abbreviation of binary digit. It is the smallest unit of memory. A collection eight bits is called byte. One byte can store single character.

Data Transmission Mode

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The manner by which information is sent starting with one spot then onto the next is called information transmission mode.

Types of Transmission Modes:

• Simplex mode
• Half duplex mode
• Full duplex mode

1. Simplex Mode:

In simplex mode, information can stream just one way. It can't be moved in the two ways. It-works in a way like a single direction road. The direction of flow never changes. It cannot perform both actions.

2. Half-Duplex Traffic:

In half-duplex mode, information can stream in the two ways however not simultaneously. It is transmitted one-way at one time. A gadget with half-duplex mode can send or get information yet not simultaneously. Model web surfing is an illustration of half-duplex correspondence. The website page is downloaded and shown before the client gives another solicitation.

3. Full-Duplex Mode:

In full-duplex mode, information can go in the two ways at the same time. Full duplex mode is a quicker method of information transmission when contrasted with half duplex. Time isn't squandered in adjusting the course of information stream.

Types of data transmission

There are two types of data transmission. These are as follows:

• Parallel Transmission
• Serial Transmission

Parallel Transmission:

A strategy for transmission in which gatherings of pieces are sent simultaneously over various wires is called equal transmission. It is typically unidirectional. Each piece is sent over a different line. The interior exchange of information in a PC utilizes an equal mode. The information transmission among PC and printer is done usin8 equal transmission.

Serial Transmission:

A technique for transmission in which information is sent the slightest bit at a time is called sequential transmission. The person pieces are sent successively. Sequential transmission is slower than equal transmission as information is sent successively the slightest bit at a time. Phone lines utilize this technique for information transmission. Every individual piece of data goes along its own correspondence way.

Thank you so much for your attention. Now my lecture and my course is End. Remember me in your prayers.

If you want to know previous lecture then follow this link below:

Lectures	Topic	Links
Lecture 01	Basic Concept Of IT	Link
Lecture 02	Information Network	Link
Lecture 03	Application and uses of Computer	Link
Lecture 04	Data Communication	Continue

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