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JQ - J ohn’s Q uarterly High Quality Gentlemen's Magazine

JQ - J ohn’s Q uarterly High Quality Gentlemen's Magazine. The Great ATM Vs GigE Debate. Cover Story:. Author: John A. Clark. Industry analysis shows Ethernet is the clear choice for the desktop Token Ring important in vertical markets ATM to-the-desk for niche applications.

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JQ - J ohn’s Q uarterly High Quality Gentlemen's Magazine

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  1. JQ - John’s Quarterly High Quality Gentlemen's Magazine

  2. The Great ATM Vs GigEDebate Cover Story: Author: John A. Clark

  3. Industry analysis shows Ethernet is the clear choice for the desktop • Token Ring important in vertical markets • ATM to-the-desk for niche applications Desktop Connectivity

  4. Ease of Use/Cost Standards Status Compatibility Issues Network Speed/distance Supported Applications Network Management Network Resilience Routing/Layer 3 switching Backbone Comparisons

  5. Gigabit-Ethernet Just “Plain Old Ethernet” but many differences Not many New Skills Required Low Risk / Low CostFeeling ATM Now solid proven technology - many reference installations Anchorage Accord simplifies ATM forum standards Some Administrative & Training Costs Ease of Use / Cost

  6. Gigabit-Ethernet 802.3z Q1’98 802.3ab Q1’99 802.3ax NewFlow Control 802.1P OK 802.1Q Q1’98 RSVP, RTP… ?? ATM LANE 2.0 OK MPOA 1.0 OK NHRP OK Sig 4.0 OK TM 4.0 OK Anchorage Accord combined standard Standards Status

  7. Gigabit-Ethernet Up to now only One-on-One Testing More Recently Gigabit-Ethernet Alliance ATM Many Independent Compatibility and Performance Tests are Available Compatibility Issues

  8. Gigabit-Ethernet 1000BaseCX: 25m 1000BaseSX: 300m 1000BaseLX: 550m MM/3km SM 1Gbps limit Network Diameter Restrictions when Shared ATM 25Mbps 155Mbps - OC3c 622Mbps - OC12c800m MM/15km SM 2.4Gbps - OC48c … no theoretical limit No Network Diameter Restrictions Network Speed/Distance

  9. Gigabit-Ethernet Pure LAN Technology Traffic Type: Data QoS: Rudimentary: RSVP Flow Control: All-or-Nothing, Localised (Impact on QoS ?) Enough Bandwidth to support everything …. at the moment ATM LAN / MAN / WAN Traffic Types: Data, Voice, Video, … QoS: Sophisticated CBR, UBR, ABR, … Flow Control: Rate Based, End-to-End New APIs will use QoS and Optimise Traffic for Specific Applications Supported Applications

  10. Gigabit-Ethernet Simple Adaptation of Ethernet MIBs and Actual Applications ATM ATM Forum MIBs and Proprietary MIBs in current use WAN MIBs to be finalised ATM complexity introduces some Network Management challenges Network Management

  11. Gigabit-Ethernet Spanning Tree Protocol blocks parallel links - stability issues? No standards based load-sharing - Mostly proprietary Use of OSPF / RIP with Layer 3 switching ATM Build-in Redundancy Parallel Load-sharing links for resilience & aggregate bandwidth Full Meshed Topologies Network Resilience

  12. Gigabit-Ethernet Routing via high 100/1000 Mbps links VLAN trunks with IEEE 802.1Q coming Layer 3 hardware routing switches with n Mbps throughout/ n usec latency Routing/Layer 3 Switching ATM • Routing via high 100 Mbps links (1000Mbps to follow) • VLAN trunks with ATM VNR proven • Layer 3 switching via ATM Forum MPOA rolling out during 98

  13. What’s Your Backbone Made Of? Backpage Questionnaire: 10 questions to tell if you’re an “A” or a “G”

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