fcit presentation first year bca

1. BASIC ELEMENTS OF COMMUNICATION SYSTEM
AND DATA TRANSMISSION MODES
 PREPARED BY : VAIBHAV JAIN

2. What isCommunication ?
According to John W. Newstrom (n.d),
communication is the transfer of
information from one person to another.
He believes that it is a way of reaching
other by transmitting idea, facts, thoughts,
feelings and values.

3. Elements ofCommunication system
• There are six elements of
Communication system which
includes:
Information source
Input transducer
Transmitter
Channel
Receiver
Output transducer

4. Information source
 A source or sender is one of the basic
concepts of communication and
information processing. Sources
are objects which encode message data
and transmit the information, via a
channel, to one or more observers (or
receivers).

5. Input transducer
 This input transducer converts the non-
electrical physical quantity into an
electrical signal. The physical quantities
such as sound or light can be converted
into electrical quantities such as voltage
or current by using this transducer.
Example: Microphone

6. CHANNEL
THE CHANNEL IS THATT
WHICH IS RESPONSIBLE
FOR THE DELIVERY OF
THE CHOSEN MESSAGE
FORM FOR EXAMPLE POST
OFFICE, INTERNET,RADIO

7. Transmitter
 A transmitter is an electronic device
used in telecommunications to
produce radio waves in order to
transmit or send data with the aid of
an antenna. The transmitter is able to
generate a radio frequency alternating
current that is then applied to the
antenna, which, in turn, radiates this as
radio waves

8. Receiver/ Decoder
• The receiver or the decoder is
responsible for
extracting/decoding meaning
from the message. The receiver is
also responsible for providing
feedback to the sender. In a
word, it is his/her job to
interpret.

9. Output transducer
 The output transducer transfers signals
out of the electrical domain and into the
domain that can be perceived by one of
the five human senses. A substantial
amount of power is usually required to
transfer information out of the electrical
domain. An output transducer can: Produce
sound with a speaker or buzzer..

10. TRANSMISSION MODES
The term Transmission Mode
defines the direction of the flow of
information between two
communication devices
i.e. it tells the direction of signal
flow
between the two devices.
There are three ways or modes of
data transmission: Simplex,
Half duplex (HDX), Full duplex
(FDX)

11. Simplex: In Communication Networks, Communication
can take place in one direction connected to such a
circuit are either a send only or receive only device.
There is no mechanism for information to be
transmitted back to the sender. Communication is
unidirectional. TV broadcasting is an example. Simplex
transmission generally involves dedicated circuits.
Simplex circuits are analogous to escalators, doorbells,
fire alarms and security systems.
Examples of Simplex mode:
1.A Communication between a Computer and a keyboard
involves simplex duplex transmission. A television
broadcast is an example of simplex duplex transmission.
2.Another example of simplex transmission is loudspeaker
system. An announcer speaks into a microphone and
his/her voice is sent through an amplifier and then to all
the speakers.

12. Half Duplex: A half duplex system can transmit data in
both directions, but only in one direction at a time that
mean half duplex modes support two-way traffic but in
only one direction at a time. The interactive transmission
of data within a time sharing system may be best suited to
half-duplex lines. Both the connected devices can transmit
and receive but not simultaneously. When one device is
sending the other can only receive and vice-versa. Data is
transmitted in one direction at a time, for example. a
walkie-talkie.
Example of half duplex mode:
A walkie-talkie operates in half duplex mode. It can only
send or receive a transmission at any given time. It cannot
do both at the same time.
As shown in fig. computer A sends information to
computer B.

13. Full Duplex: A full duplex system can transmit data
simultaneously in both directions on transmission path.
Full-duplex method is used to transmit the data over a
serial communication link. Two wires needed to send data
over a serial communication link layer. Full-duplex
transmission, the channel capacity is shared by both
communicating devices at all times.
Both the connected devices can transmit and receive at the
same time. Therefore it represents truly bi-directional
system. The link may contain two separate transmission
paths one for sending and another for receiving.
Example of Full duplex mode:
Telephone networks operate in full duplex mode when two
persons talk on telephone line, both can listen and speak
simultaneously.

14. Thank You