Data Communication and Computer Networks (BIT 121)

Dr. Husam OstaAssistant Professor

Marks

Attendance & Contribution----10Quizzes ----------------------------20Mid-term exam-------------------25Project------------------------------20Final exam-------------------------25

Introduction

Communication Systems - a

Communication describes the general information exchange Systems. People. Media. etc.

Communication Systems - b

Primitive communications systems: Smoke signals. Drums. Semaphore.

Communication Systems - c

Modern communications systems : Telephone. Internet. Television. Radio. Fax.

Communication sorts of things

What sorts of things are communicated?Speech.Pictures.Video.Data.

Communication components

Communication components consisted the following:

Transmitter Receiver Medium Message

Protocol

sender of information destination of information area to bring information from sender to receiver The message is the information (data) to be

communicated. A protocol is a set of rules that govern data

communications.

What is a Communication System?

Communication systems are systems designed to transmit information.

Types of Communication

Point-to-point CommunicationMultipoint CommunicationSimplex CommunicationHalf Duplex CommunicationFull – duplex Communication

Point-to-point CommunicationIn this type, communication takes place

between two end points. For instance, in the case of voice

communication using telephones, there is one calling party and one called party.

Multipoint Communication In this type of communication, there is one

sender and multiple recipients. For example, in voice conferencing, one person

will be talking but many others can listen. The message from the sender has to be

multicast to many others.

Simplex Communication

In simplex communication, communication is possible only in one direction.

Example:TV Radio

Half Duplex Communication Half-duplex communication is

possible in both directions between two entities (computers or persons), but one at a time.

2 way signal transmission but not simultaneously.

Example: walkie talkie

Full – duplex Communication In a full-duplex communication system, the two

parties—the caller and the called one—can communicate simultaneously.

Telephone is one of the examples of this type.

Network

A computer network is an interconnection of a group of computers to exchange data and share the resources.

Network

Computer Networks can be classified according to:ScaleFunctional relationship Network TopologyProtocolNetwork medium Network Scope

Network classification by Scale

Network classification by Scale

Personal Area Network (PAN)Local Area Network (LAN).Campus Area Network (CAN).Metropolitan Area Network (MAN).Wide Area Network (WAN).

Network classification by Functional Relationship

Client-server.

Peer-to-peer (workgroup).

Network classification by Network Topology

Bus network.

Star network.

Ring network.

Mesh network.

Network classification by Protocol

Computer networks may be classified according to the communications protocol that is being used on the network.

Network classification by Network Medium Electronic Networks

Optical Networks.

Wireless Networks.

Network Access Scope

Intranet

Extranet

Internet

Summery

We understand what is Communication System. We understand the types of communication. We understand what is Computer Network. We understand the Network classification.