Ethernet Technology Rev. 1.00 Page 2 May 1996 u 1973 Development begins u 1976 First paper on Ethernet published u 1977 Ethernet is patented u 1979 DEC, INTEL, and XEROX collaborate on Ethernet Version 1. u 1980 Ethernet V.1 is published u 1980 Xerox ships first Ethernet u 1982 Ethernet version 2 is published u 1983 IEEE approves 802.3 standard u 1985 Ethernet is produces by more than 200 vendors u 1985 Installed base exceeds 20.000 Units u 1992-1994 Fast Ethernet / 100 Mbps/ Switching Ethernet - the History
Ethernet Technology Rev. 1.00 Page 3 May 1996 Protocols Layer Network Logical Link Media Access Control Physical Link 802.6 Metro Area Network 802.2 Logical Link Control 802.4 Token Passing Bus 802.5 Media Access 802.5 Token Passing Ring 802.3 CSMA/CD 802 Internetworking 802.3 Access Control 802.4 Access Control 802.6 Access Control 802 Network Architecture Management 10BASE-210BASE-510BASE-T10BASE-F IEEE 802.3 standards
Ethernet Technology Rev. 1.00 Page 4 May 1996 u CSMA/CD Carrier Sense Carrier 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 Collision Detect Collision Detect Be aware of signal collisions - back off when detected 50 ohm Terminator 50 ohm Terminator Computer earth Signal Ethernet Access Method Shared media ( bus ) Collision
Ethernet Technology Rev. 1.00 Page 5 May 1996 Ethernet Frames Preample 1010....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 Preample 1010....10 (56 bits) SFD 10....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 1996 u Physical Signalling u Collision Detect u SQE Test u Jabber Function TX Wires RX Wires Collision Power Ethernet Transceiver Drop cable to station (AUI Interface) LAN media Transceiver
Ethernet Technology Rev. 1.00 Page 7 May 1996 u Max. 500 m. Cable Segments u Max. 100 Stations per Cable Segment u 2.5 m. between Transceivers u 50 Ohm terminator at each end 10BASE-5 Yellow Cable 50 ohm Terminator 50 ohm Terminator Computer earth (IEEE802.3 media) 2.5 m. Drop cable Transceiver AUI interface
Ethernet Technology Rev. 1.00 Page 8 May 1996 u Max. 185 m. Cable Segments u Max. 30 Stations per Cable Segment u Min. 0.5 m. Distance between Stations u BNC Connectors used to attach stations u 50 Ohm terminator at each end BNC T Connector Build-in transceiver 50 ohm Terminator 10BASE-2 Cheapernet Cable External transceiver Drop cable AUI interface
Ethernet Technology Rev. 1.00 Page 9 May 1996 u Requires a Cabling Hub u Max. 100 m. from Station to Hub 10BASE-T UTP Cable Star topology Cabling Hub (repeater) 100 m. Cable segments
Ethernet Technology Rev. 1.00 Page 10 May 1996 u Noise Immune u No Ground Loops u Long Distance (up to 2Km.) u Stations connect to a Central Hub u Max. Two Stations per Cable Segment u Typically used for Inter-Hub Connectivity 10BASE-F Fiber Optic Cable
Ethernet Technology Rev. 1.00 Page 11 May 1996 u Increased Flexibility u Improved Availability u Inherent Management Capabilities Intelligent structured wiring systems Cabling HubPatch panel Cabling conducts RJ-45 outlets Network Management - control - monitoring Port status: - active - not active - partitioned
Ethernet Technology Rev. 1.00 Page 12 May 1996 10BASE-T&F Design Rules Link segments 1 2 3 4 5 10BASE-F Max. 500 m. 10BASE-T Max. 100 m. 1 2 3 4 10BASE-F Max. 1000 m. 10BASE-T Max. 100 m.
Ethernet Technology Rev. 1.00 Page 13 May 1996 u Bridges Receive and Buffer the Frames u Each Side of a Bridge is a Separate Collision Domain u Bridges Decide to Discard or Forward Packets u Bridges allow for a more Effective Utilization of the Overall Bandwidth Collision Domain Collision Domain Ethernet Transparent Bridges Bridge Dedicated 10 Mbps Dedicated 10 Mbps
Ethernet Technology Rev. 1.00 Page 14 May 1996 Fast Ethernet 100 Mbps: î 100BASE-T or î 100VG-AnyLAN
Ethernet Technology Rev. 1.00 Page 15 May 1996 Switched Ethernet Ethernet Switch Shared 10Mbps segmentDedicated 10Mbps segments 100BASE-T Full duplex 10Mbps Existing cabling and adapters Replaces the old Hub
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