Introduction to Data Communication. Fundamental Characteristics. Components of Data Communication. Direction of Data flow. Signals. Transmission Media. Networking.

1. DATA COMMUNICATIONS
Abdullah Al Amin
ID: 171-15-9365
Most. Momtaj Jahan Akhi
ID: 171-15-9380
Jannatul Mahiya Mahi
ID: 171-15-9342

2.  Introduction to Data Communication.
 Fundamental Characteristics.
 Components of Data Communication.
 Direction of Data flow.
 Signals.
 Transmission Media.
 Networking.
CONTENTS

3. What is Data Communication?
Data Communications is the exchange of data between two
devices via some forms of transmission medium (such as wire
cable).
 For data communications to occur, the communicating
devices must be part of a communication system made of a
combination of hardware and software.
 The effectiveness of a data communication system depends
on four fundamental characteristics:-delivery, accuracy,
timeliness and jitter.

4. Fundamental characteristic
The effectiveness of a data communication system depends on
three fundamental characteristics:
 Delivery: The system must deliver data to the correct
destination.
 Accuracy:
 Data delivered accurately.
 Altered data which left uncorrected are unusable.
 Timeliness: The system must deliver data in timely manner
without delay (real-time).

5. Components of Data Communication
 Sender
 Receiver
 Message
 Tramsmission Medium
 Protocol

6. Data Flow
Simplex
Half-duplex
Full-duplex

7. Signals
 There are two types of signals to transfer data.
Signals
Analog Signal Digital Signal

8. Analog Signal
An Analog signal is a continuous which denoted Sine
wave.The representing the Analog signal passes through an
infinite number of points.

9. Digital Signal
A Digital signal can have only a limited number of defined
values. Although each value can be any number, it is as simple
as 1 and 0.

10. Transmission Media
Transmission media is a pathway that carries the information
from sender to receiver. We use different types of cables or
waves to transmit data. Data is transmitted normally through
electrical or electromagnetic signals.

11. Types of Transmission Media
Transmission Media
Guided Media Unguided Media
Coaxial Cable Twisted Pair Cable Fiber Optic Cable
Radio Waves Micro waves Infrared Waves

12. Networking
 A network is a set of devices(often referred to as nodes)
connected by media links.
 A node can be a computer, printer or any other device
capable of sending and/or receiving data generated by other
nodes on the network.
 The links connecting the devices are often called
communication channels.

13. Networking

14. Networking
Mainly four devices are used in networking:
 Modem
 Hub
 Switch
 Router