Data communication (simple explanation)

DATA COMMUNICATION

Presented by: Md. Akid Sultan Khan

ID:1104067CSE,CUET.

Objective

Explain Data Communication.Show some simple diagram for Data

Communication.Explain about modems.Explain various wireless

communication.

Aim

Show some aspects of Data Communication & types of varieties in this extra-ordinary sector of communication.

Definition

Refers to the moving or transferring of data between two electronic devices.

Simple Data Communication system

Data Communications over Standard Telephone Lines - Modems

Most telephone lines are analog, not digital.

modem converts it from analog format to digital format.

`

The analog signal(audible)

is sent throughtelephone lines.

MODEM MODEM 011010001011010001

Digital signal Digital signal

This modem convertsdigital to analog.

This modem convertsanalog to digital.

Internal Modem

External Modem

Using Digital Data Connections

Dedicate to transmitting data in digital format.

Transmit data at much higher speeds than standard analog phone lines.

Diagram of digital data connections1 2

3

4

Broadband Connectionstransmit data faster than is possible

through a standard dial up connection using a modem.

The most commonly used digital telephone services are:

ISDN,T1 and T3 DSL Cable Modems ATM

Wireless communication

Use RF or IR to transmit data between devices on LAN.

Wireless signals are electromagnetic waves that can travel through a vacuum of outer space.

Categories of wireless Communication

WLAN

WAN

WIMAX

WiFi

Local Area Networks (LANs)

Connected by a cable, infrared link, or small transmitters.

Transmits data by breaking it into small pieces.

Every LAN uses a protocol.

LAN Communication Sample

Wide Area Networks (WANs)

transmit data over leased high-speed phone lines or wireless links such as satellites.

LAN 1LAN 2

WAN

WiMAX

Provide 30 to 40 megabit-per-second data rates.

Enable to delivery of last mile wireless broadband access .

Simple WiMAX Communication system

Wi-Fi

radio waves to provide wireless high-speed internet and network connections

easily accessible in the corporate infrastructures

Simple WiFi System

ConclusionIn this presentation we

Explain how computer data travels over telephone lines.

Explain a modem’s function.Differentiate four types of digital data

connections.Describe how wireless networks

functions.

Thanks To All

AnyQuestions???