Wired LANs and Ethernet
01204325: Data Communication
and Computer Networks
Adapted from lecture slides by Behrouz A. Forouzan
© The McGraw-Hill Companies, Inc. All rights reserved
Asst. Prof. Chaiporn Jaikaeo, Ph.D.
chaiporn.j@ku.ac.th
http://www.cpe.ku.ac.th/~cpj
Computer Engineering Department
Kasetsart University, Bangkok, Thailand
Outline
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IEEE standards for LAN/MAN/WAN
Traditional Ethernet
Unicast and multicast addresses
Fast Ethernet
Gigabit Ethernet
Ten-Gigabit Ethernet
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IEEE Standards
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Project 802
 standards for enabling intercommunication
among equipment from a variety of
manufacturers
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E.g.,
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IEEE 802.3  Ethernet
IEEE 802.11  Wireless LAN (Wi-Fi)
IEEE 802.15  Wireless PAN (Bluetooth, etc)
http://en.wikipedia.org/wiki/IEEE_802
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IEEE Standards for LANs
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Logical Link Control Sublayer
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Provides flow and error control for upper
layer protocols
Most upper layer protocols (such as IP) do
not require such services
DSAP – Destination Service
Access Point
SSAP – Source Service
Access Point
(Similar to TCP/IP ports)
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Wired Ethernet
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"Traditional" or "Original" Ethernet created
at Xerox's Palo Alto Research Center
(PARC) in 1976
Ethernet standards are set by IEEE 802.3
working group
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Evolution of Ethernet
Ethernet Evolution
Standard
Ethernet
(10 Mbps)
Fast
Ethernet
(100 Mbps)
Gigabit
Ethernet
Ten-Gigabit
Ethernet
100-Gigabit
Ethernet
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IEEE 802.3 MAC Frame
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Min and Max Frame Length
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Ethernet Addresses
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48 bits (6 bytes) in length
Uniquely assigned to each Ethernet
network interface card (NIC)
Usually written in hexadecimal notation
E.g.,
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Unicast vs. Multicast Addresses
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A unicast address defines one recipient
A multicast address defines a group of recipients
The broadcast address defines a group of all
stations in the same LAN
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A special case of multicast addresses
All bits are 1s
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Example
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Define the type of the following
destination addresses:
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4A:30:10:21:10:1A
47:20:1B:2E:08:EE
FF:FF:FF:FF:FF:FF
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Standard Ethernet
Categories of Standard Ethernet
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Encoding in Standard Ethernet
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10Base5 Implementation
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10Base2 Implementation
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10Base-T Implementation
CAT3 Cable
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10Base-F Implementation
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Standard Ethernet Summary
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Raising the Bandwidth
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Bridged Ethernet
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A bridge divides a network into two or
more segments
Each segment is independent of one
another, bandwidth-wise
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Collision Domain
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Bridges help split collision domain into smaller
ones
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Switched Ethernet
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Full-Duplex Ethernet
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Fast Ethernet
Fast Ethernet
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Data rate: 100 Mbps
Standard  IEEE 802.3u
Backward-compatible with Standard
Ethernet
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Fast Ethernet Topologies
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Fast Ethernet Implementations
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Encoding for 100Base-TX
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Encoding for 100Base-FX
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Encoding for 100Base-T4
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Fast Ethernet Summary
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Gigabit Ethernet
Gigabit Ethernet
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1000 Mbps
Standard  IEEE 802.3z, 802.3ab
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Gigabit Ethernet Encoding
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4D-PAM5 Encoding
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Used in 1000Base-T
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Gigabit Ethernet Summary
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10-Gigabit and Up
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IEEE Standards
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802.3ae  10GbE over fiber
802.3ak  10GbE over twin axial cable
(10GBASE-CX4)
802.3an  10GbE over UTP (10GBASE-T)
802.3ba  40GbE and 100GbE
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