Chapter 11 Data Communications Data Communications MANAGEMENT INFORMATION SYSTEMS 8/E Raymond McLeod, Jr. and George Schell Copyright 2004 Prentice-Hall, Inc. 11-1 Communication Basics Communication Basics Computer communications is at Computer communications is at three levels three levels – Application level Application level – Computer level Computer level – Communication channel Communication channel Protocol Protocol – Set of rules for communications Set of rules for communications – OSI Standard OSI Standard 11-2
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Chapter 11Data CommunicationsData Communications
MANAGEMENT INFORMATION SYSTEMS 8/E
Raymond McLeod, Jr. and George Schell
Copyright 2004 Prentice-Hall, Inc.
11-1
Communication BasicsCommunication Basics
�� Computer communications is at Computer communications is at
three levelsthree levels
–– Application level Application level
–– Computer levelComputer level
–– Communication channelCommunication channel
�� Protocol Protocol
–– Set of rules for communicationsSet of rules for communications
–– OSI StandardOSI Standard
11-2
OSI (Open System Interconnection) OSI (Open System Interconnection)
ReferenceReference ModelModel
Layer Name Purpose
7 Application Layer Application-to-application communication
6 Presentation Layer Manage data representation conversions
5 Session Layer Establish and maintain communication channel
4 Transport Layer Guarantee end-to-end integrity of transmission
3 Network Layer Route data between network addresses
2 Data Link Layer Move data from one network address to another
1 Physical Layer Put data onto and off of the network media
11-3
11-4
Andrew S. Tannebaum,
1996, “Computer
Network”, Third
Edition, Prentice Hall
Inc., A. Simon &
Schuster Company,
Upper Saddle River,
New Jersey 07458
11-5
Andrew S. Tannebaum, 1996, “Computer Network”, Third Edition, Prentice Hall Inc., A.
Simon & Schuster Company, Upper Saddle River, New Jersey 07458
11-6
Andrew S. Tannebaum, 1996,
“Computer Network”, Third
Edition, Prentice Hall Inc., A.
Simon & Schuster Company,
Upper Saddle River, New
Jersey 07458
ISO WebsiteISO Website
11-7
Protocols for Computer Protocols for Computer
CommunicationCommunication
�� Early computersEarly computers
–– TerminalsTerminals
–– Sneaker netSneaker net
�� System Network Architecture (SNA)System Network Architecture (SNA)
–– Established by IBM in 1974Established by IBM in 1974