Telecommunications, the Internet, and

Wireless TechnologySaleh Hasan

Information Systems Course UIBS

Telecommunications System Components and Functions

Computers to process information

Terminals or any input/output devices that send or receive data

Communications processors

Communications software

• Transmit information• Establish interface

between sender and the receiver

• Route messages along most efficient paths

• Perform elementary processing of information

• Perform editorial tasks on data

• Convert message speed or format

• Control flow of information

Types of Signals Digital signal

Discrete waveform

Transmits data coded into two discrete states as 1-bits and 0-bits

Used for data communications

Analog signal

Continuous waveform

Passes through communications medium

Used for video, audio and voice communications

Communication Networks

Star Network: All computers and other devices are connected to a central host computer

Bus Network: Links a number of computers by a single circuit

Ring Network: All computers are linked by a closed loop

Local Area Networks; Require their own dedicated channels, Encompass a limited distance, Gateway, router, Network Operating System (NOS), peer-to-peer

Wide Area Networks (WANs); Span large geographical distance, Consist of variety of cable, satellite, and microwave technologies, Switched lines, dedicated lines

Electronic Commerce and Electronic Business Technologies

Email

Group ware

Voice mail

Fax

Teleconferencing

Data conferencing

Videoconferencing

Distance learning

E-learning

The New Information Technology (IT) Infrastructure

Connectivity

Measures how well computers and computer-based devices communicate

Open System

Software systems

Operate on different hardware platforms

TCP / IP model; is based on OSI layers but it’s focused on the transmission. It’s a short practical model, not so theoretical than OSI.

Internet Service Provider (ISP); Commercial organization with a permanent connection to Internet

What is the Internet?

Information appliance Device customized to perform few specialized computing tasks with minimal user effort

Internet Tools for Communication

Electronic Mail (E-Mail) –Connects people worldwide

Usenet Newsgroups –Online discussion group

LISTSERV –First email broadcast from mailing list

Chatting –Live, conversations among people

Instant messaging -Creating private chat channels

Internet telephony (VoIP) –Two-way voice transmission among the internet

The Wireless Web Web-based applications Enables users to access digital information

from the Internet Wireless Web Standards:

Wireless Application Protocol (WAP) = Accessing information over a mobile.

WML (Wireless Markup Language) = Provides navigation support, data input, hyperlinks, text and image presentations, and forms.

Microbrowser = Web browser designed for use on mobiles

I-mode = Mobile internet similir service to WAP

Voice portals – access to information through spoken commands and voice responses

Web Content Management Tool

A content management system (CMS) is a system providing a collection of procedures used to manage work flow in a collaborative environment. These procedures can be manual or computer-based. The procedures are designed to do the following:

Allow for a large number of people to contribute to and share stored data

Control access to data, based on user roles (defining which information users or user groups can view, edit, publish, etc.)

Aid in easy storage and retrieval of data Reduce repetitive duplicate input Improve the ease of report writing Improve communication between users

The Challenge of Managing the New Information Technology Infrastructure

Loss of management control

Connectivity and application integration challenges

Organizational change requirements

Hidden costs of enterprise computing

Scalability, reliability, and security downtime