data communications and computer networks
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Overview of Data Communicationand Computer Networks
01204325: Data Communication and Computer Networks
Asst. Prof. Chaiporn Jaikaeo, [email protected]
http://www.cpe.ku.ac.th/~cpjComputer Engineering Department
Kasetsart University, Bangkok, Thailand
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Outline
Data Communication Overview
Definition
Components
Protocols and standards
Network Overview
Connectivity
Categories
Internetworks
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Motivations
Efficient way to share resources
Cost – less expensive
Accessibility – easier
Efficient way to exchange information
Time – faster
Size – bigger
Correctness – more accurate
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Data Communication: Definition
Data Communication:
Transfer of data from one device to another via
some form of transmission medium.
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Data Communication
Hi, how are you?
01010001
Hi, how are you?
UserComputer
you?
how
are
Hi,
you?
how
are
Hi,
01010001
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Components in Communication
Hi, how are you?
5 Protocol
4 Medium
3 Receiver2 Sender
1 Message
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Data Representation
Numbers
8/16/32 bit integers
floating point
Text
ASCII, Unicode
Images
Bit patterns, Graphics formats JPG/GIF/etc
Audio Samples of continuous signal
Video Sequence of bitmap images
150
2
255
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Protocols and Standards
Protocol A set of rules governing data communications
Syntax: format of data block
Semantics: meaning of each section
Timing: speed and sequencing
Standards De facto (in practice) standards not approved but widely adopted
De jure (in law) standards approved by an organization
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Standards Organizations
Creation Committees
ISO, ITU-T, ANSI, IEEE, EIA
Forums
Regulatory Agencies
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Direction of Data Flow
Simplex: One direction only
Server Monitor
data flow
Keyboard
data flow