802.3 Ethernet

802.3 802.3z 802.3u比较

IEEE 802.3 Ethernet IEEE 802.3u Fast Ethernet IEEE 802.3z Gigabit Ethernet ANSI X3T9 Fibre Channel

802.3 802.3z 802.3u比较

Ethernet– Table of Contents

Part 1: IEEE 802.3 Ethernet

Part 2: IEEE 802.3u Fast Ethernet

Floor 4

Ethernet/ Fast Ethernet Switch

Part 3: IEEE 802.3z Gigabit EthernetFloor 3 Hub Stack

Fast Ethernet Switch

Bridge/ Router Floor 1

WAN

Broadband Network Technologies

IEEE 802.3 Ethernet2

802.3 802.3z 802.3u比较

Ethernet– History

Developed by Xerox Palo Alto Research Centre First published by Digital Equipment, Intel, and Xerox as DIX (DEC, Intel, Xerox) standard Strongly changed and standardised by IEEE in the IEEE 802.3 Therefore, two different versions are existing:– Ethernet version 2 (DIX)– IEEE 802.3– differences are mainly in the Media Access frame Topology of an Ethernet is logically (mostly physically, too) a bus

Broadband Network Technologies

IEEE 802.3 Ethernet3

802.3 802.3z 802.3u比较

Ethernet– Technological Overview A lot of standards exist for different Ethernet versions:– 1Base5 (Starlan), 10Base5 (Ethernet), 10Base2 (Cheapernet)– 10BaseT, 10BaseF, 10Broad36– 100BaseTX, 100BaseFX, 100BaseT2, 100BaseT4– 1000Base-LX, 1000Base-SX, 1000Base-CX, 1000Base-T– 100BaseVG, 100VG-AnyLAN First number identifies transfer rate (1=1MBit/s, 10=10MBit/s, ...) Base= baseband transmission, Broad= broadband transmission Last digit, number, or character identifies characteristics of the transmission medium:– T= twisted pair, FX/LX/SX= fibre optics, CX= shielded balanced copper, T4= 4 pair twisted pair, T2= 2 pair twisted pair– length of a segment - 2=185m, 5=500mIEEE 802.3 Ethernet4

Broadband Network Technologies

802.3 802.3z 802.3u比较

Part 1: Survey

Part 1: IEEE 802.3 Ethernet– Physical Layer– Medium Access– Configuration Rules

Part 2: IEEE 802.3u Fast Ethernet

Part 3: IEEE 802.3z Gigabit Ethernet

thick coax segment (500m max)

MAU15-pin AUI connector

coax tap (MDI)

transceiver AUI cable (50m max)

Ethernet interface with external MAU

male"N" connector 50 Ohm terminator

Broadband Network Technologies

IEEE 802.3 Ethernet5

802.3 802.3z 802.3u比较

IEEE 802.3 Ethernet– IntroductionApplications

Management

CSMA/CD MAC

AUI Interface

10Base5 (Thick Coax)

10Base2 (Thin Coax)

10Base-T (UTP cat 3,4,5)

10Base-F (Fibre)

Ethernet Physical Layer (PHY) OptionsBroadband Network Technologies IEEE 802.3 Ethernet6

802.3 802.3z 802.3u比较

Physical Layer Tasks of the physical layer defined as:– send and receive bit streams– collision detection– encoding and decoding of signals– generation of the preamble– generation of clocks for synchronisation– testing of the transmission of data from the station up to the Medium Access Unit (MAU)

Broadband Network Technologies

IEEE 802.3 Ethernet7

802.3 802.3z 802.3u比较

Physical Layer (cont.)– Architectural ModelHigher Protocol Layer Logical Link Control (LLC) Medium Access Control (MAC) PLS Physical Layer

MDI

transmission mediumPLS AUI PMA Physical Signalling Sub-layer Attachment Unit Interface Physi

cal Medium Attachment MDI MAU Medium Dependent Interface Medium Attachment Interface

Broadband Network Technologies

MAU

PMA

AUI

standardised in IEEE 802.3

IEEE 802.3 Ethernet8

802.3 802.3z 802.3u比较

Medium Access– CSMA/CD

Shared medium access is realised with Carrier Sense Multiple Access with Collision Detection (CSMA/CD)– each station is listening to the carrier (carrier sense)– if no transmission takes place, stations can send data to any other station (multiple access)– if two or more stations send data at the same time, each station has to stop further transmission (collision detection)– after a certain time (random for each station), stations can try to send data again CSMA/CD needs– multiple stations connected to a segment (multiple access)– sense of the carrier before data is sent (carrier sense)– sense of the carrier during data transmission (collision detection)

Broadband Network Technologies

IEEE 802.3 Ethernet9

802.3 802.3z 802.3u比较

Medium Access (cont.)– Domains

Router Ethernet

Bridge/ Switch Ethernet

Repeater/ Hub Ethernet

Ethernet

Collision Domain

Broadcast Domain

Broadband Network Technologies

IEEE 802.3 Ethernet1

802.3 802.3z 802.3u比较

Medium Access (cont.)– IEEE 802.3 FramesIEEE 802.3 Ethernet MAC frames

PA 7

SFD 1

DA 6

SA 6

LEN 2

LLC 3/4

Data

PAD variable

FCS 4

PA DA SA SFD

preamble destination address source address start frame delimiter

LLC PAD FCS LEN

logical link control padding frame check sequence (CRC-32) lengthIEEE 802.3 Ethernet1

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