Data communication involves the exchange of data between two devices via a transmission medium. For communication to occur, the devices must be part of a communication system consisting of hardware and software. A key aspect of data communication systems is delivering data to the correct destination accurately and in a timely manner. Essential components include a sender, receiver, transmission medium, and set of protocols to govern the communication.

1. Prepare by
Mr. shashikant M. Saryam

2. What is Data Communication?
 The exchange of data between two
devices via some form of transmission
medium such as a wire cable.
 For data communications to occur,the
communicating devices must be part of
a communication system made up of a
combination of hardware (physical
equipment) and software (programs).

3.  Delivery:
The system must deliver data to the correct
destination.
 Accuracy:
The system must deliver the data accurately.
Data that have been altered in transmission
and left uncorrected are unusable.
 Timeliness:
The system must deliver data in a timely
manner. Data delivered late are useless.

4.  Sender/Transmitter: The sender is the device that
sends the data message
 Receiver/destination: The receiver is the device
that receives the message
 Medium: The transmission medium is the
physical path by which a message travels from
sender to receiver
 Message: The message is the information (data)
to be communicated
 Set of rules (Protocol) :
To govern data communications, various sets of
rules had been already designed by the designers
of the communication systems, which names as
protocol

11.  Singling rate: the number of signal element
sent in 1s(baud). Also called pulse rate
 Data rate: number of data elements(bits)sent
in 1s(bps)
 Bit rate: number of bits sent per second
 Baud rate: how many times signal changes
per second

12.  Sharing resources
 Reduced cost
 Reduced time
 Scalability
 Reliability
 security

15. The physical topology of network refers to the
configuration of cables, computers and other
Peripherals.
Types of Network topology
 Bus
 Star
 Ring
 tree
 Mesh

17.  Based on Transmission technologies:
Point to point, multipoint, broadcast
 Based on physical size:
PAN, BAN, LAN, MAN, VAN, VPN
 Based on architecture:
peer to peer, client server

29.  User login accounts & passwords can be
assigned in one place
 Access to multiple shared resources (such as
data, files or printers) can be centrally
granted to single user or group of users
 Problem can be track, diagnosed and can
often fixed from one location

30. Thank you..