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Gigabit Ethernet Vs Asynchronous Transfer Mode

Gigabit Ethernet Vs Asynchronous Transfer Mode. John A.Clark Bay Networks Technical Account Manager John.Clark@Anixter.Com. Not a Desktop Debate. Industry analysis shows 10/100 Ethernet is the clear choice for the desktop technology. Token Ring important in vertical markets

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Gigabit Ethernet Vs Asynchronous Transfer Mode

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  1. Gigabit EthernetVs Asynchronous Transfer Mode John A.Clark Bay Networks Technical Account Manager John.Clark@Anixter.Com

  2. Not a Desktop Debate • Industry analysis shows 10/100 Ethernet is the clear choice for the desktop technology • Token Ring important in vertical markets • ATM to-the-desk for niche applications

  3. LAN Protocol Breakdown 80% 70% 60% 50% 40% 30% 20% 10% 0% IP 1994 1996 1998E 2000E 2002E SNA IPX Others NetBEUI IP Source: Gartner Group 3/97 Not a Protocol Debate • IP has emerged as the protocol of choice - most organisations have a migration plan • Few networks are IP only - other protocols e.g. IPX, NetBEUI, SNA are still important on existing LANs

  4. It’s a Backbone Issue What Technology/Business Factors Should be Considered? • Network Speed/distance • Standards Status • Network Resilience • Routing/Layer 3 switching • Supported Applications • Network Management • Investment/Ease of Use

  5. Gigabit Ethernet 1000BaseCX: 25m copper 1000BaseSX: 550m on 50 micron MM fibre, 220m on 62.5 micron (DMD) 1000BaseLX: 550m all MM fibre , 3km SM fibre - Long reach 50km proprietary 1 Gbps limit - 10 Gbps ? 200m network diameter restrictions - CSMA/CD as shared media ATM 25Mbps Cat V UTP 155Mbps - OC/3 fibre 622Mbps - OC/12 fibre 800+m on MM, 15km on SM 2.4Gbps - OC/48, 10 Gbps - OC/192 ...no theoretical limit DWDM - multiple OC/192 ATM/SDH WAN (e.g. BT Cellstream) No max network diameter Network Speed/Distance

  6. Gigabit Ethernet 802.3z OK 802.3ab 1000baseT tba 802.3x flow control 802.1P priority OK 802.1Q VLAN tag OK RSVP, RTP…Diffserv tba ATM Anchorage Accord combined standard IISP PNNI OK LANE 2.0 OK MPOA 1.0 OK NHRP OK Standards Status

  7. Gigabit Ethernet Proprietary H/W or Spanning Tree ST stability /convergence issues? No standards based load-sharing -proprietary MLT Use of OSPF / RIP with Layer 3 switching ATM Inherently highly redundant technology Standards based NNI Parallel load-sharing links for resilience & aggregate bandwidth Highly meshed topologies - PNNI multi peer groups Network Resilience

  8. Gigabit Ethernet IP/IPX Routing via high 100/1000 Mbps links “One Arm” router using 802.1Q VLAN trunks Layer 3 hardware routing switches with n Mbps throughout/ n usec latency Routing/Layer 3 Switching ATM Routing via high speed 100/1000 Mbps Ethernet links VLAN trunks with ATM VNR proven Layer 3 switching via ATM Forum MPOA - initially IP - then IPX

  9. Gigabit Ethernet LAN/MAN Technology Data only traffic - but optimised for IP ….VoIP, video etc. Enough Bandwidth to support everything QoS (ToS/priority) from 802.1P, RSVP, Diffserv etc. Switch-to-switch 802.3x flow control - source quench “pause” frames ATM LAN / MAN / WAN Traffic Types: Data, Voice, Video APIs use QoS and optimise traffic for specific applications Sophisticated QoS: UBR, CBR,VBR(rt/nrt), ABR policed traffic contract - peak, mean, burst etc. End-to-end flow control, traffic shaping queues, CLP bit discard Supported Applications

  10. Gigabit Ethernet Simple adaptation of Ethernet MIBs Compatibility with existing management applications ATM ATM Forum MIBs and proprietary MIBs in current use WAN MIBs to be finalised ATM VC connectionless complexity introduces network management challenges Network Management

  11. ATM Solid proven technology - many reference installations Anchorage Accord simplified ATM forum standards - new standards, new features Some Administrative & Training Costs Gigabit Ethernet “Plain old Ethernet”? - frame format - actually technical differences Low risk / low lostfeeling - 10>100>1000 Mbps Not many new skills required for support - low training costs Investment/Ease of Use

  12. Thank You - Questions? John A.Clark Bay Networks Technical Account Manager John.Clark@Anixter.Com

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