ATM Vs GigE The Breakfast Club JQ - J ohns Q uarterly High Quality Gentlemen's Magazine.

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Presentation transcript:

ATM Vs GigE The Breakfast Club JQ - J ohns Q uarterly High Quality Gentlemen's Magazine

ATM Vs GigE The Breakfast Club The Great ATM Vs GigE Debate Cover Story: Author: John A. Clark

ATM Vs GigE The Breakfast Club Desktop Connectivity l Industry analysis shows Ethernet is the clear choice for the desktop l Token Ring important in vertical markets l ATM to-the-desk for niche applications

ATM Vs GigE The Breakfast Club Backbone Comparisons l Ease of Use/Cost l Standards Status l Compatibility Issues l Network Speed/distance l Supported Applications l Network Management l Network Resilience l Routing/Layer 3 switching

ATM Vs GigE The Breakfast Club Ease of Use / Cost Gigabit-Ethernet l Just Plain Old Ethernet but many differences l Not many New Skills Required l Low Risk / Low Cost Feeling ATM l Now solid proven technology - many reference installations l Anchorage Accord simplifies ATM forum standards l Some Administrative & Training Costs

ATM Vs GigE The Breakfast Club Standards Status Gigabit-Ethernet l 802.3zQ198 l 802.3abQ199 l 802.3axNew Flow Control l 802.1POK l 802.1QQ198 l RSVP, RTP…?? ATM l LANE 2.0OK l MPOA 1.0OK l NHRPOK l Sig 4.0OK l TM 4.0OK l Anchorage Accord combined standard

ATM Vs GigE The Breakfast Club Compatibility Issues Gigabit-Ethernet l Up to now only One- on-One Testing l More Recently Gigabit-Ethernet Alliance ATM l Many Independent Compatibility and Performance Tests are Available

ATM Vs GigE The Breakfast Club Network Speed/Distance Gigabit-Ethernet l 1000BaseCX: 25m l 1000BaseSX: 300m l 1000BaseLX: 550m MM/3km SM l 1Gbps limit l Network Diameter Restrictions when Shared ATM l 25Mbps l 155Mbps - OC3c l 622Mbps - OC12c 800m MM/15km SM l 2.4Gbps - OC48c … no theoretical limit l No Network Diameter Restrictions

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

ATM Vs GigE The Breakfast Club Network Management Gigabit-Ethernet l Simple Adaptation of Ethernet MIBs and Actual Applications ATM l ATM Forum MIBs and Proprietary MIBs in current use l WAN MIBs to be finalised l ATM complexity introduces some Network Management challenges

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

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

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