what is data. data communication ,and networks.

3. Data consist on raw facts and
figures.by using an object data
can be easily get. while
information is process foam of
data. data is not certain while
information is certain.
Data
process
information

4. Electronically transmission of data from one
place to another place by using a medium is
called data communication.
There are three components of data
communication
Sender

Medium
receiver

5.  The
way of transmission of data from one
place to other is called data transmission
mode
 There is three transmission modes
 Simplex Mode
 Half duplex Mode
 Full duplex Mode

6. Simplex
mode
•
•
•
•
Data can flow only in one direction
Not moved in both direction.one way street
Not perform both action either send or receive data
Direction of flow not changes
Half duplex
• Data can flow in both directions but not at same time
• One way at one time
• Device with half duplex mode can send and receive data but not at same time
Full duplex
• Data can flow in both directions simonstenously
• Fast speed and time is not waited

7. Simplex
Half Duplex
Full Duplex

8. 

Digital signals are
transmitted in sequence
of voltage
They represented in
binary foams



Digital Data Transmission
Continues in foam of wave
and this wave is called
carrier wave
The number of wave repeats
during a specific time is
known as frequency.
The height of carrier wave
is called amplititude
Analogue Data transmission

10. 
A computer network is a set of two or more
computers connected through to share
information and other resources through
cables, satelite,or telephone cables.
There is three types of networks
LAN(local area networks)
 WAN(wide area networks)
 MAN(metropoletin area networks)


12. The physical layout or the way in which
network connection are made is called
network topologies.
Bus topology
Ring topology
Star topology

13. consists of a single cable—called
a bus— connecting all nodes on a
network without intervening
connectivity devices

15. Every node on the network is connected
through a central device