ModuleEthernet Technology

ModuleEthernet Technology

Ethernet Technology Rev. 1.00 Page 2

May 1996May 1996

1973 Development begins1973 Development begins 1976 First paper on Ethernet published1976 First paper on Ethernet published 1977 Ethernet is patented1977 Ethernet is patented 1979 DEC, INTEL, and XEROX collaborate on Ethernet 1979 DEC, INTEL, and XEROX collaborate on Ethernet

Version 1. Version 1. 1980 Ethernet V.1 is published1980 Ethernet V.1 is published 1980 Xerox ships first Ethernet1980 Xerox ships first Ethernet 1982 Ethernet version 2 is published1982 Ethernet version 2 is published 1983 IEEE approves 802.3 standard1983 IEEE approves 802.3 standard 1985 Ethernet is produces by more than 200 vendors1985 Ethernet is produces by more than 200 vendors 1985 Installed base exceeds 20.000 Units1985 Installed base exceeds 20.000 Units 1992-1994 Fast Ethernet / 100 Mbps/ Switching1992-1994 Fast Ethernet / 100 Mbps/ Switching

Ethernet - the HistoryEthernet - the HistoryEthernet - the HistoryEthernet - the History

Ethernet Technology Rev. 1.00 Page 3

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Protocols Layer

Network

Logical Link

MediaAccessControl

PhysicalLink

802.6MetroAreaNetwork

802.2 Logical Link Control

802.4TokenPassingBus

802.5MediaAccess

802.5TokenPassingRing

802.3CSMA/CD

802 Internetworking

802.3AccessControl

802.4AccessControl

802.6AccessControl

802NetworkArchitectureManagement

10BASE-2 10BASE-5 10BASE-T 10BASE-F

IEEE 802.3 standardsIEEE 802.3 standardsIEEE 802.3 standardsIEEE 802.3 standards

Ethernet Technology Rev. 1.00 Page 4

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CSMA/CDCSMA/CD Carrier SenseCarrier Sense

““Listen before trying to transmit - is the cable free? “Listen before trying to transmit - is the cable free? “

Multiple Access Multiple Access ““Many Stations are allowed to use the same media”Many Stations are allowed to use the same media”

Collision DetectCollision Detect““Be aware of signal collisions - back off when detected”Be aware of signal collisions - back off when detected”

50 ohmTerminator

50 ohmTerminator

Computer‘earth’

SignalSignal

Ethernet Access MethodEthernet Access MethodEthernet Access MethodEthernet Access Method

Shared media ( bus )

Collision

Ethernet Technology Rev. 1.00 Page 5

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Ethernet FramesEthernet FramesEthernet FramesEthernet Frames

Preample1010....10(62 bits)

Sync 11(2 bits)

DA

(6 bytes)

Type

(2 bytes)

Data . . . . . (padding) SA

(6 bytes)

FCS

(4 bytes)(45 - 1500 bytes)

Ethernet V.II

MAC addresses

Preample1010....10(56 bits)

SFD10....11(8 bits)

DA

(6 bytes)

Length

(2 bytes)

Data . . . . . (padding) SA

(6 bytes)

FCS

(4 bytes)(45 - 1500 bytes)

IEEE 802.3

MAC addresses

Ethernet Technology Rev. 1.00 Page 6

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Physical SignallingPhysical Signalling Collision DetectCollision Detect SQE TestSQE Test Jabber FunctionJabber Function

TX

Wire

s

RX

Wire

s

Co

llision

Po

we

r

Ethernet TransceiverEthernet TransceiverEthernet TransceiverEthernet Transceiver

‘Drop’ cable to station(AUI Interface)

LAN mediaTransceiver

Ethernet Technology Rev. 1.00 Page 7

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Max. 500 m. Cable SegmentsMax. 500 m. Cable Segments Max. 100 Stations per Cable SegmentMax. 100 Stations per Cable Segment 2.5 m. between Transceivers2.5 m. between Transceivers 50 Ohm terminator at each end50 Ohm terminator at each end

10BASE-5 ‘Yellow‘ Cable10BASE-5 ‘Yellow‘ Cable10BASE-5 ‘Yellow‘ Cable10BASE-5 ‘Yellow‘ Cable

50 ohmTerminator

50 ohmTerminator

Computer‘earth’

(IEEE802.3 media)

2.5 m.

Drop cable

Transceiver

AUI interface

Ethernet Technology Rev. 1.00 Page 8

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Max. 185 m. Cable SegmentsMax. 185 m. Cable Segments Max. 30 Stations per Cable SegmentMax. 30 Stations per Cable Segment Min. 0.5 m. Distance between StationsMin. 0.5 m. Distance between Stations BNC Connectors used to attach stationsBNC Connectors used to attach stations 50 Ohm terminator at each end50 Ohm terminator at each end

BNCT Connector

Build-intransceiver

50 ohmTerminator

10BASE-2 “Cheapernet” Cable10BASE-2 “Cheapernet” Cable10BASE-2 “Cheapernet” Cable10BASE-2 “Cheapernet” Cable

Externaltransceiver

Drop cable

AUI interface

Ethernet Technology Rev. 1.00 Page 9

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Requires a Cabling HubRequires a Cabling Hub Max. 100 m. from Station to HubMax. 100 m. from Station to Hub

10BASE-T “UTP” Cable10BASE-T “UTP” Cable10BASE-T “UTP” Cable10BASE-T “UTP” Cable

Star topology

Cabling Hub(repeater)

100 m.Cable segments

Ethernet Technology Rev. 1.00 Page 10

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Noise ImmuneNoise Immune No Ground LoopsNo Ground Loops Long Distance (up to 2Km.)Long Distance (up to 2Km.) Stations connect to a Central HubStations connect to a Central Hub Max. Two Stations per Cable SegmentMax. Two Stations per Cable Segment Typically used for Inter-Hub ConnectivityTypically used for Inter-Hub Connectivity

10BASE-F Fiber Optic Cable10BASE-F Fiber Optic Cable10BASE-F Fiber Optic Cable10BASE-F Fiber Optic Cable

Ethernet Technology Rev. 1.00 Page 11

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Increased FlexibilityIncreased Flexibility Improved AvailabilityImproved Availability Inherent Management CapabilitiesInherent Management Capabilities

Intelligent structured wiring systemsIntelligent structured wiring systemsIntelligent structured wiring systemsIntelligent structured wiring systems

Cabling Hub Patch panelCabling conducts

RJ-45 outlets

Network Management - control - monitoring

Port status: - active - not active - partitioned

Ethernet Technology Rev. 1.00 Page 12

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10BASE-T&F Design Rules10BASE-T&F Design Rules10BASE-T&F Design Rules10BASE-T&F Design Rules

Link segments

1

2

3

4

5

10BASE-FMax. 500 m.

10BASE-TMax. 100 m.

1

2

3

4

10BASE-FMax. 1000 m.

10BASE-TMax. 100 m.

Ethernet Technology Rev. 1.00 Page 13

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Bridges Receive and Buffer the FramesBridges Receive and Buffer the Frames Each Side of a Bridge is a Separate Collision Each Side of a Bridge is a Separate Collision

DomainDomain Bridges Decide to Discard or Forward PacketsBridges Decide to Discard or Forward Packets Bridges allow for a more Effective Utilization of Bridges allow for a more Effective Utilization of

the Overall Bandwidth the Overall Bandwidth

Collision Domain

Collision Domain

Ethernet Transparent BridgesEthernet Transparent BridgesEthernet Transparent BridgesEthernet Transparent Bridges

BridgeDedicated10 Mbps

Dedicated10 Mbps

Ethernet Technology Rev. 1.00 Page 14

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Fast EthernetFast EthernetFast EthernetFast Ethernet

100 Mbps:

100BASE-T

or

100VG-AnyLAN

Ethernet Technology Rev. 1.00 Page 15

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Switched EthernetSwitched EthernetSwitched EthernetSwitched Ethernet

Ethernet Switch

Shared 10Mbps segment Dedicated 10Mbps segments

100BASE-TFull duplex10Mbps

Existingcabling andadapters

Replacesthe ‘old’Hub

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