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DATA COMMUNICATION Lecture-43
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Recap of Lecture 42 Local Area Networks (LANs) Project 802
Protocol Data Unit (PDU) Ethernet
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Overview of Lecture 43 Ethernet Implementations Other Ethernet works
Token Bus/Ring
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Ethernet
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10 BASE 2: Thin Ethernet Reduced cost and ease of installation
The cable is lighter weight and more flexible Short range
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10 BASE 2: Thin Ethernet
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10 BASE-T: Twisted-Pair Ethernet
The most popular standard in the IEEE series Star-topology LAN using UTP cable
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10 BASE-T: Twisted Pair Ethernet
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1 BASE 5: StarLAN Daisy chain Range can be increased
As many as 10 stations can be linked in a chain
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1 BASE 5: StarLAN
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Switched Ethernet An attempt to improve the performance of 10BASE-T
N ×10 Mbps with N devices
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Switched Ethernet
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Switched Ethernet
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Fast Ethernet Data rate can be increased by decreasing the collision domain If 10 Mbps 100 Mbps, then 2500 m 250 m
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Fast Ethernet
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100 Base-TX and 100 Base-FX
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100 Base-T4
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Gigabit Ethernet Usually serves as a backbone Four implementations
1000Base-SX, 1000Base-LX: Optical fiber, m 1000Base-CX (STP), 1000Base-T (UTP): 25 m
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Gigabit Ethernet
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Token Bus Bus topology and collision-free using tokens
Used for factory automation and process control
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Token Bus Other LANs are not suitable for this purpose
Token Bus has no commercial application in data communications
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Token Ring Token Ring allows each station to send one frame per turn
Access method: Token passing
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Token Ring
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Summary Ethernet Implementations Other Ethernet Networks
Token Bus/Ring
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Suggested Reading Section 12.2, 12.3, 12.4, 12.5
“Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan
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