2. 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
3. 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
4. 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
5. Electronic Commerce and Electronic
Business Technologies
Email
Group ware
Voice mail
Fax
Teleconferencing
Data conferencing
Videoconferencing
Distance learning
E-learning
7. 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
8. What is the Internet?
Information appliance Device customized to perform few
specialized computing tasks with minimal user effort
9. 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
10. 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
11. 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
12. 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
