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Department of
Computer Science
975361Data Communication and Computer Network I
Spring 2009
P. Jitngernmadan
975361 Data Communication and Computer Network I
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Contact Information
� Firstname: Prajaks� Lastname: Jitngernmadan
� Office: SD 507 Department of Computer ScienceFaculty of Science
� Email: [email protected]
� Office Hours: Every Thursday from 4 p.m. – 5.30 p.m. Or by using the Email.
P. Jitngernmadan
975361 Data Communication and Computer Network I
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Course Details
P. Jitngernmadan
� 3(3-0-6)
� With 3 Credit
� 3 Hours of lecture
� Students should do the self-study at least 6 hours a week!
975361 Data Communication and Computer Network I
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Course Description
P. Jitngernmadan
� Needs and problems in data dissemination and communication. Layered and structuring of data and standards of information of OSI. Overview of data communication. Multiple linkage and single linkages. Physical standards. Electrical signals, data organization, data validation. Control of network and networking. Hardware and their utilization. Alternating circles,group protocols. Process to process communication. Fundamental concepts in group communication application programming.
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Chapter 1 Introduction
P. Jitngernmadan
Chapter 1
Introduction and fundamental terms
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� Data Communication is the handling and transmission of digital data over communication channels between computers and/or other devices (in general over the great distance)
� These 2 aspects must be included:
� Computer networks
� How the computers are connected?
� Which media can be use to transmit the data?
� How can I rule the access of the transmitting media?
� Protocols
� How the data exchange can be done uniformly?
� How can we achieve the realizable and effective transmission?
Chapter 1 Introduction
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� Fundamental terms
� Tasks of networks:
� Establish the connection (connectivity) for data transmission
� Enable effective and low-cost use
� Provide services that can be used from several applications
� Powerful transmission and quality of transmission
Chapter 1 Introduction
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� Fundamental terms
� Tasks of networks:
� Establish the connection (connectivity) for data transmission
� Enable effective and low-cost use
� Provide services that can be used from several applications
� Powerful transmission and quality of transmission
Chapter 1 Introduction
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� Fundamental terms – Local Area Network (LAN)
� Corporation-wide networking, connect computers and others devices
� Network belongs to the company
� A few workstations to 1000 in one network
� Example: Ethernet, Token Ring
� Data transfer rate: up to 10 Gbps
� Types: Direct connection network (shared network) or switchednetwork
Chapter 1 Introduction
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� Fundamental terms –Wide Area Network (WAN)
� The distances are almost around the world
� Transmission media between companies (carrier)
� Fixed connections or dial-up connections
� Typical: X.25, ISDN, ATM (Asynchronous Tranfer Mode)
� Data transfer rate: up to 10 Gbps
� With costs (according to using time or data volumes)
� Switched Network
Chapter 1 Introduction
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� Fundamental terms – Shared Network (direct connection)
� Point-to-point connection
� Multiple access, point-to-multiple point connection
Chapter 1 Introduction
Wired or wireless
connection
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� Fundamental terms – Topologies
� Bus Topology
Chapter 1 Introduction
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� Fundamental terms – Topologies
� Star Topology
Chapter 1 Introduction
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� Fundamental terms – Topologies
� Tree Topology
Chapter 1 Introduction
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� Fundamental terms – Switched Network
� Indirect connection
Chapter 1 Introduction
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� Fundamental terms – Circuit Switching (conventional telephony)
� Throughout connection between participants
� Exclusive connection use for two partners
� Receiver must accept the messages immediately
� Network can’t buffer, delay or recode
� Gauranteed bandwidth and constant signal runtime
� But: line is occupied, even if there is nothing to be transmitted
� Example: telephone network
Chapter 1 Introduction
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� Fundamental terms – Packet Switching (message switching)
� Messages will be cut into fixed-size packets
� Packets will be transmitted to the node computers, buffered there and go on transmission over other nodes
� Physical circuit connection only exists between nodes
� Transfer rates can be various on the way
� Gauranteed bandwidth and constant signal runtime are possible but not always implemented
� Example: switched LAN, X.25, Frame Relay, ATM, IP-Switching
Chapter 1 Introduction
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� Fundamental terms – Joint Network
Chapter 1 Introduction
Switching nodes betweennetworks using differrent
technologies
Network usinguniform
technology
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� Fundamental terms – Definition Network
� A network is a connection structure for two or more terminals that are connected directly or indirectly.
� Or consisting of networks that are connected over switching nodes
Chapter 1 Introduction
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� Fundamental terms – Data Packet
� Transmitting data (sequence of binary encoded information) will be sampled
� The sampling will be extended by management information
� Payload: sampling from the transmitting data or message
� Management information: Header
� Address information of sender and receivier
� Control information for different purposes
Chapter 1 Introduction
Transmitting data
PayloadHeader
