Presentation on DATA COMMUNICATION by Cj Subham

DATA COMMUNICATION
PRESENTED BY-
SUBHAM LAHIRY MAJUMDAR
BRANCH:- E&TC
REGD NO.:- F15011003035
SEMESTER:- 5TH SEMESTER

CONTENTS-
 Introduction
 Basic Parts of Data Communication
 Data Transmission Types:-
i. Serial Data Transmission
ii. Parallel Data Transmission
 Types Of Serial Data Transmission:-
i. SYNCHRONOUS TRANSMISSION
ii. ASYNCHRONOUS TRANSMISSION
 Data Transmission Modes:-
i. SIMPLE
ii. HALF DUPLEX
iii. FULL DUPLEX
 BIBLIOGRAPHY
 CONCLUSION

What is data communication?
Transmission of data from one place to another
place is called data communication.

Basic parts of data communication
Three components are essential in data
communication.
1. Sender / Source
2. Data Communication Medium
3. Receiver / Sink

Basic parts of data communication
Sender/Sourc
e
Receiver/Sink
Medium

Sender / Source
Sender or source is the data producer or the
place where the data is produced for data
transmission.
E.g.: Imagine you call a friend of yours.
Then you become the Sender or Source.
Sender

Data Communication Medium
The medium which is used to transmit data to
the receiver.
E.g.: In the example mentioned above, wireless
…….communication
becomes the data communication medium there.

Receiver / Sink
The receiver is the person who gets data at the
end.
E.g.: Your friend is the receiver in the above
mentioned example.
Receiver

DATA TRANSMISSION TYPES
Data transmission can be done in two ways.
1.Serial data transmission
2. Parallel data transmission

Serial data transmission
•Data is transmitted here, one after the other
(one bit at a time, in a serial way).
•Such data transmission is done in bits in a
computer network.
•One wire is enough here for data transmission.

Parallel data transmission
•Several bits are transmitted at a time
•Several wires are used for this.
•In most of the instances, use of at least eight
wires for this is the normal way.

SERIAL TRANSMISSION IS FURTHER
DIVIDED INTO 3 TYPES:-
 ASYNCHRONOUS TRANSMISSION
 SYNCHROMOUS TRANSMISSION
 ISOCHRONOUS TRANSMISSION

ASYNCHRONOUS TRANSMISSION:-
 In asynchronous transmission 1-byte of data is
transmitted at a time.
 Bit synchronisation is made possible by using start and
stop bits.
 Start bit indicates the beginning of data.
 It is usually a zero.
 Stop bit indicates the end of data.
 Addition of start and stop bit increases the no. of data
bits.
 Hence more bandwidth is required for data
transmission.
 There is an idle time between the transmission of data
bytes.
 This idle time is known as gap.
 Ex:- (keyboard and modem)

SYNCHRONOUS TRANSMISSION
 In synchronous transmission blocks of data are transmitted.
 It does not transmit start and stop bits.
 There is no gap between the various bytes in the data stream.
 As the bytes are placed on the link without any gap it is the
responsibility of the receiver to separate the bits stream into
bytes so as to reconstruct the original information.
 In order to receive data error free the receiver and sender
operates in same clock frequency.
 It is faster as compared to asynchronous transmission.
 It is costlier than asynchronous transmission.
 It is used for high speed data communication between
computers.

Data Transmission Speed
The speed of data transmission is measured in
Bytes per second (bps)
Kbps (kilobytes per second)
Mbps (Megabytes per second)
Gbps (Gigabytes per second).

Simplex
•Data is directed one way only.
•There is no any space for data transmission to be
directed the other way.
Examples: Television transmission
Radio transmission.
From your computer to the printer.
From the mouse to your computer.
•Data transmission is always done here only from
sender to receiver.

SIMPLEX-EXAMPLES
One way only
Television transmission

Half-Duplex
Data can be directed one way at a time.
The data flows in one direction or the other,
but not both at the same time.
Example: Walkie-talkie.
Where only one party can talk to the other at a
time

HALF DUPLEX -EXAMPLES
Walkie-talkie

HALF DUPLEX -EXAMPLES
Walkie-Talkie.

Data can be transmitted both ways at a time.
Example: Telephone.
Both ways at a time
Duplex/Full duplex

CONCLUSION
 New forms of business involving data, knowledge
and communication will result in a Information
Revolution. Computer networks will lift the current
businesses in the agricultural and industrial sectors
up to a higher level. Fast communication between
people, accurate control and a better co-ordination
of tasks will enable companies to
offer products and services that are exclusive and
of a better quality.

BIBLIOGRAPHY-
1. WIKIPEDIA
2. DATA COMMUNICATION NOTES
3. Www.GOOGLE.COM
4. TEXT BOOK OF DATA COMMUNICATION (BY B.A.
FOROUZAN)
5. Text book of ADVANCE COMMUNICATION(BY
S.RAPPAPORT)

Presentation on DATA COMMUNICATION by Cj Subham

Presentation on DATA COMMUNICATION by Cj Subham

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