Module Ethernet Technology Module Ethernet Technology.
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Transcript of Module Ethernet Technology Module Ethernet Technology.
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
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
May 1996May 1996
Fast EthernetFast EthernetFast EthernetFast Ethernet
100 Mbps:
100BASE-T
or
100VG-AnyLAN
Ethernet Technology Rev. 1.00 Page 15
May 1996May 1996
Switched EthernetSwitched EthernetSwitched EthernetSwitched Ethernet
Ethernet Switch
Shared 10Mbps segment Dedicated 10Mbps segments
100BASE-TFull duplex10Mbps
Existingcabling andadapters
Replacesthe ‘old’Hub
Ethernet Technology Rev. 1.00 Page 16
May 1996May 1996