1996 ethernet achim v1 by 9jjVQuZ

VIEWS: 8 PAGES: 16

									      Module
Ethernet Technology
              Ethernet - the History

         1973 Development begins
         1976 First paper on Ethernet published
         1977 Ethernet is patented
         1979 DEC, INTEL, and XEROX collaborate on Ethernet
          Version 1.
         1980 Ethernet V.1 is published
         1980 Xerox ships first Ethernet
         1982 Ethernet version 2 is published
         1983 IEEE approves 802.3 standard
         1985 Ethernet is produces by more than 200 vendors
         1985 Installed base exceeds 20.000 Units
         1992-1994 Fast Ethernet / 100 Mbps/ Switching

                                                         May 1996
Ethernet Technology Rev. 1.00 Page 2
              IEEE 802.3 standards
                                                        Protocols                            Layer


                                                        802 Internetworking                  Network




                                                         802.2 Logical Link Control         Logical Link
                                 802
                                 Network
                                 Architecture
                                 Management 802.3         802.4       802.5      802.6        Media
                                              Access      Access      Media      Access       Access
                                              Control     Control     Access     Control      Control

                                                      802.4          802.5       802.6
                                              802.3   Token          Token       Metro       Physical
                                              CSMA/CD Passing        Passing     Area        Link
                                                      Bus            Ring        Network




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



                                                                                                           May 1996
Ethernet Technology Rev. 1.00 Page 3
                  Ethernet Access Method
               CSMA/CD
                        Carrier Sense
                           “Listen before trying to transmit - is the cable free? “
                        Multiple Access
                           “Many Stations are allowed to use the same media”
                        Collision Detect
                           “Be aware of signal collisions - back off when detected”
                                              Collision           Signal
                             Signal



                                                                                         50 ohm
 50 ohm                                                                                 Terminator
Terminator
                                           Shared media ( bus )

Computer
 ‘earth’




                                                                             May 1996
    Ethernet Technology Rev. 1.00 Page 4
        Ethernet Frames

       Ethernet V.II
         Preample Sync                 DA        SA       Type       Data . . . . .                       (padding)         FCS
         1010....10 11
         (62 bits)  (2 bits)       (6 bytes)   (6 bytes) (2 bytes)                                                      (4 bytes)
                                                                                      (45 - 1500 bytes)



                                  MAC addresses




       IEEE 802.3
         Preample SFD                  DA        SA      Length      Data . . . . .                       (padding)         FCS
         1010....10 10....11
         (56 bits)  (8 bits)       (6 bytes)   (6 bytes) (2 bytes)                                                      (4 bytes)
                                                                                      (45 - 1500 bytes)


                                 MAC addresses




                                                                                                                 May 1996
Ethernet Technology Rev. 1.00 Page 5
     Ethernet Transceiver
                                 Physical Signalling
                                 Collision Detect
                                 SQE Test
                                 Jabber Function



LAN media
                                            Transceiver


                                                      Collision

                                                                  RX Wires

                                                                             TX Wires
                                          Power




                                       ‘Drop’ cable to station
                                           (AUI Interface)
                                                                                        May 1996
Ethernet Technology Rev. 1.00 Page 6
        10BASE-5 ‘Yellow‘ Cable

              Max. 500 m. Cable Segments
              Max. 100 Stations per Cable Segment
              2.5 m. between Transceivers
              50 Ohm terminator at each end
                                                              2.5 m.
                                  Transceiver
                                                                                          50 ohm
 50 ohm                                                                                  Terminator
Terminator
                                          (IEEE802.3 media)

Computer                                                               Drop cable
 ‘earth’
                                                                       AUI interface




                                                                              May 1996
   Ethernet Technology Rev. 1.00 Page 7
     10BASE-2 “Cheapernet” Cable

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

        50 ohm
       Terminator
                                                     External
                                          BNC        transceiver
                                       T Connector
                                                     Drop cable
                                         Build-in
                                                     AUI interface
                                       transceiver




                                                                     May 1996
Ethernet Technology Rev. 1.00 Page 8
     10BASE-T “UTP” Cable

           Requires a Cabling Hub
           Max. 100 m. from Station to Hub




                                                        Cabling Hub
                           Star                          (repeater)
                                           100 m.
                         topology
                                       Cable segments




                                                               May 1996
Ethernet Technology Rev. 1.00 Page 9
     10BASE-F Fiber Optic Cable


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




                                             May 1996
Ethernet Technology Rev. 1.00 Page 10
Intelligent structured wiring systems
                 Increased Flexibility
                 Improved Availability
                 Inherent Management Capabilities

                 Cabling Hub            Patch panel
                                                         Cabling conducts

    Port status: - active
                 - not active
                 - partitioned


                                               Network Management
                                                - control
                                                - monitoring

RJ-45 outlets
                                                                    May 1996
Ethernet Technology Rev. 1.00 Page 11
10BASE-T&F Design Rules


             1
                                                          2   1
Link segments
                                                                      10BASE-T        2
                                                                      Max. 100 m.
                                        10BASE-T
                                                      3
                                        Max. 100 m.

                                                                                  3

                                                4                 10BASE-F
                                                                  Max. 1000 m.
                               10BASE-F
                               Max. 500 m.



                                                              4

             5


                                                                       May 1996
Ethernet Technology Rev. 1.00 Page 12
 Ethernet Transparent Bridges

 Bridges Receive and Buffer the Frames
 Each Side of a Bridge is a Separate Collision
  Domain
 Bridges Decide to Discard or Forward Packets
 Bridges allow for a more Effective Utilization of
  the Overall Bandwidth


 Collision                     Dedicated            Dedicated   Collision
                               10 Mbps     Bridge
  Domain                                            10 Mbps      Domain


                                                                 May 1996
 Ethernet Technology Rev. 1.00 Page 13
Fast Ethernet


                                 100 Mbps:

                                  100BASE-T

                                        or

                                  100VG-AnyLAN


                                                  May 1996
Ethernet Technology Rev. 1.00 Page 14
Switched Ethernet



                                        Full duplex            100BASE-T
                                         10Mbps

                                                                                         Replaces
                                                                                         the ‘old’
                                               Ethernet Switch                           Hub



                                                                                         Existing
 Shared 10Mbps segment                            Dedicated 10Mbps segments              cabling and
                                                                                         adapters




                                                                              May 1996
Ethernet Technology Rev. 1.00 Page 15
                                        May 1996
Ethernet Technology Rev. 1.00 Page 16

								
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