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Gigabit Ethernet vs. ATM

Gigabit Ethernet vs. ATM. Why Gigabit Ethernet?. Primary Drivers. Conventional Wisdom - 1994. Conventional Wisdom – now!. Conventional Wisdom – 1994. Conventional Wisdom – now!. Is GbE Ethernet all over again?. Yes!!! A Thousand Times Yes. Same frames Same Knowledge Same Infrastructure

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Gigabit Ethernet vs. ATM

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  1. Gigabit Ethernet vs. ATM

  2. Why Gigabit Ethernet? K. Salah

  3. Primary Drivers K. Salah

  4. Conventional Wisdom - 1994 K. Salah

  5. Conventional Wisdom – now! K. Salah

  6. Conventional Wisdom – 1994 K. Salah

  7. Conventional Wisdom – now! K. Salah

  8. Is GbE Ethernet all over again? • Yes!!! A Thousand Times Yes. • Same frames • Same Knowledge • Same Infrastructure • Multiple vendor support • Low cost, interoperable • Simple, easy migration • Same network management philosophy • Very few new things to learn • Just the next step in Ethernet K. Salah

  9. Scalability of Ethernet K. Salah

  10. All Other Ethernet Ethernet Traffic Dominance • Why Ethernet traffic at 80+%? • Installed base • Low-cost desktop connections • Low-cost server connections • Scalability 10/100/1000 • Smooth migration • Network reliability • Network management tools and techniques 100% 80% 60% 40% 20% 0% NICs 1997 Shipments and 1997 Installed Base K. Salah

  11. How about QoS? • ATM wins, but wait! • You need ATM all the way to the desktop • Most of LAN traffic is IP • With 1GbE PC-to-Switch, you have 2G bps BW to run any delay sensitive traffic. • MPLS, RSVP, and 802.1p are narrowing the QoS gap. K. Salah

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  13. Jumbo Frames • Payload is much bigger than 1500 bytes • Minimize overhead at hosts and saves bandwidth in links • Can go up to 9000 bytes • Super Jumbo frames can go to up to 64000 bytes • As big as the MTU • No fragmentation needed • Memory buffer at nodes is a major problem. K. Salah

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  15. GbE Topology Alternatives Connection Applications Topology Modes Media Objective • High throughput • Long distance • Full duplex • Half duplex • Multimode • Singlemode • Copper • Campus backbone • Building backbone • Wiring closet uplinks • Servers Switched • Low cost • Short distance • Half duplex • “Classic repeater” • Multimode • Copper • Servers • Desktops (long-term) Shared • Low cost • Long distance • Full duplex • “Buffered distributor” • Multimode • Copper • Servers • Desktops (long-term) K. Salah

  16. Cabling Support 1000 Mbps MAC (Media Access Control) 802.3z CSMA/CD Ethernet 1000BaseLX (1300 nm) MMF 550m SMF 3 km 1000BaseSX (780–850 nm) MMF 220–500m 1000BaseCX Copper Balanced Shielded Cable 25m 1000BaseT Copper Category 5 UTP 100m IEEE 802.3ab IEEE 802.3z Gigabit Interface Cards (GBICs) K. Salah

  17. 802.3z and 802.3ab Physical Media { 9u Singlemode 1000BaseLX ~1300 nm 50u Multimode Long Reach Lasers: 15 to 60 km 62.5u Multimode { 1000BaseSX ~850 nm 50u Multimode 62.5u Multimode “Long-Haul Copper” (802.3ab) { 4 pr Cat 5 UTP Balanced Shielded Cable { 1000BaseCX Copper // 100m 220m 550m 500m 25m 5 km Wiring Closet Machine Room Building Backbones Campus Backbone K. Salah

  18. GbE and Distance K. Salah

  19. 10 GbE • Standard out in 2002 • 10 Gigabit Ethernet supports only full duplex links which can be connected by switches. • Half duplex operation and CSMA/CD (carrier sense multiple access with collision detect) are not supported in 10GbE. • As of 2008, 10 Gigabit Ethernet is still an emerging technology with only 1 million ports shipped in 2007 K. Salah

  20. Deployment of 10 GbE • LAN: • both service provider and enterprise • MAN: • both dark fiber and DWDM • WAN: • Attachment to WAN access equipment at edge of OC- 192 infrastructure K. Salah

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  24. 100 GbE • presently under early development by the IEEE. • The fastest existing standard is 10 gigabit Ethernet. • In late November 2006, an IEEE study group agreed to target 100 Gbit/s Ethernet as the next version of the technology. • Support at least 10 km on SMF • Support at least 40 km on SMF (1550 nm wavelength) • Support full-duplex operation only • Preserve the 802.3 / Ethernet frame format at the MAC Client service interface • In February 2008, Opnext Inc. and Hitachi Ltd. demonstrated the first lasers to support this new high-speed standard. K. Salah

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