Communication is the process of sending a message from a human source to a human receiver. 3 Basic Elements Source / Sender Medium Receiver

1. Communications
and Networks

2. At the end of this lesson, you should be
able to:
1. Define communication;
2. Enumerate the basic elements of the
communication process.
3. Describe the different kinds of
networks;
4. Explain how technology is changing
the way people communicate.
OBJECTIVES

3. What is communication?
What are the elements of
communication?
What is a network?
DO YOU KNOW…

4. Imagine a world where there are
no words at all. How would you do
the following things?
Greet your best friend?
Tell a story
Send a message to a relative who
lives faraway.
LET’S FIND OUT

5. Draw pictures
Use hand signals
Make sounds
Language is important to
explain your feelings, share what
you know, to create and to dream.
You use it to communicate.
ANSWERS

6. Communication is the process of sending a
message from a human source to a human
receiver.
3 Basic Elements
1. Source / Sender
2. Medium
3. Receiver
COMMUNICATION

7. SOURCE MEDIUM RECEIVER

8. Computer
Communication

9. OLD WAYS OF COMMUNICATION

10. The electronic
telegraph was
developed by
engineers in the
US and UK.
Operators sent
signals through
wires.
TELEGRAPH

11. The operators used
the Morse Code, a
system developed by
Samuel FB Morse in
1844 that used
combinations of dots
and dashes instead of
letters and numbers.
MORSE CODE

12. In 1876, inventor
Alexander Graham
Bell developed the
telephone which
allows people to
speak to each other
over wires.
TELEPHONE

13. In 1887, German
scientist Heinrich
Hertz proved the
existence of invisible
radio waves which
moved at the speed of
light.
They are used to transmit
television and radio
programmes.
RADIO WAVES

14. In 1894, Guglielmo
Marconi invented
the wireless
telegraph. He
successfully sent a
radio signal across
the Atlantic Ocean
in 1901.
WIRELESS TELEGRAPH

15. First television
broadcasts were
made in the
1930’s.
TELEVISION BROADCASTS

16. Modern
Communication

17. INTERNET
Worldwide
connection of
networks that links
millions of
businesses, gov.
agencies, educ,
institutions, and
individuals.

18. WWW
Worldwide
collection of
electronic
documents on the
Internet that you
can access using a
web browser.

19. EMAIL
Transmission of
messages and files
via computer
networks.

20. INSTANT MESSAGING
Real time Internet
communication
service that allow
you to exchange
messages or files
with one or more
people.

21. CHAT
Real time typed
conversation that
takes place on
computers
connected to a
network.

22. NEWSGROUPS
Online areas where
you can conduct
written discussions
about a particular
subject with other
people

23. VIDEOCONFERENCING
Real time meeting
between two or
more
geographically
separated people
who use a network
to transmit audio
and video data.

24. FAX MACHINE
Transmits or
receive documents
over telephone
lines

25. INTERNET TELEPHONY
Sometimes called voice over IP
(VoIP)
It allows you to talk to other
people over the Internet.

26. VOICEMAIL
Functions like an answering
machine. It allows you to leave a
voice message to your phone.

27. SHORT MESSAGING SYSTEM
Also called text messaging that
allows you to type and send short
text message from a cellphone or
personal computer.

28. PICTURE MESSAGING
Also called multimedia service
MMS. It allows you to send
graphics such as pictures and
video clips.

29. Networks

30. NETWORKS
A network is a collection
of computers and devices
connected by
communication devices
and transmission media.

31. ADVANTAGE OF NETWORKS
It allows computers to share
resources like hardware,
software and data.
5 printers can share on
1computer
PCs can share documents to all
other PCs.

32. SERVER AND CLIENT
The server controls access
to the network resources.
The other computers on
the network, each called a
client, requests resources
from the server.

33. KINDS OF NETWORK
LAN (Local Area Network)
- Connects computers and
devices in a limited
geographical area, such as a
home, a school computer
laboratory, an office building, or
a group of buildings close
together.

35. KINDS OF NETWORK
WAN (Wide Area Network)
- Covers a large geographic area,
such as a big city, a country, or
the world.
- It uses a communication channel
that combines many types of
media such as telephone lines,
cables and radio waves.

37. Prepared by
THANK YOU
Teacher Michelle