Company Confidential Breakthrough Solutions for Friction-Free Networking Introducing

Company Confidential 25 September 2000 (Slide 2 ) Our Mission Enable rapid, profitable network growth and service provisioning by eliminating friction at the network edge.

Company Confidential 25 September 2000 (Slide 3 ) ATM Aggregation CES RRR ATM Switch R R R DSL Links Leased Lines Cable Access Internet Access Legacy I/Fs IP/MPLS Backbone IP/MPLS Backbone Frame Relay Switch ATM Backbone Routers The Network Edge Access Services & Aggregation Backbone/Core Edge IP Service Switch

Company Confidential 25 September 2000 (Slide 4 ) Friction-Constrained Networking Friction at the network edge inhibits rapid, profitable network growth and service deployment.

Company Confidential 25 September 2000 (Slide 5 ) Optical Backbone Optical Backbone Wireless/ 9600 Kbps DS0/64 Kbps DS1/1.5 Mbps DS3/45 Mbps OC-3/155 Mbps OC-12/622 Mbps OC-48/2.5 Gbps OC-192 /10 Gbps 9600 Kbps 10 Gbps Intelligence + Friction Edge devices are the primary source of network intelligence. But they are also the primary source of network friction. Friction at the network edge inhibits rapid, profitable network growth and service provisioning. Friction at the network edge blocks the benefits of optical networking. Source: Netforecast

Company Confidential 25 September 2000 (Slide 6 ) Sources of Friction Today’s network edge has too many boundaries: Speed and performance boundaries Protocol boundaries Management boundaries Geographic boundaries Boundaries create friction: Implementation and integration friction Provisioning friction Operational friction Cost friction Investment protection friction

Company Confidential 25 September 2000 (Slide 7 ) Breakthrough Engineering Until now, edge solutions have been constrained by technical tradeoffs. Gotham Networks combines state-of-the-art technology with breakthrough engineering to eliminate the tradeoffs and remove friction from the network edge. PerformanceIntelligence Cost

Company Confidential 25 September 2000 (Slide 8 ) Friction-Free Networking Engineering breakthroughs from Gotham Networks remove friction from the network edge: Network Simplicity – The One-Hop Edge Rapid Service Provisioning – VNode Management Extraordinary Scalability - Switchless Switch Architecture Deployment Flexibility – POP Outside the Box

Company Confidential 25 September 2000 (Slide 9 ) Introducing… GN 1600 Switchless Switch™ SmartService™ Software Gotham Element Management System (GEMS™)

Company Confidential 25 September 2000 (Slide 10 ) GN 1600 Switchless Switch™ Create a wide-portfolio of services (switch, route, cross-connect) Fast, “One-Touch” provisioning of circuits and services Guarantee Service Levels and response time Collapse the backbone to provide One-Hop, One-Switch access to the Optical Domain NEBS Level-3 Compliant 3 chassis per rack 16-slot, 40 Gbps, Expandable to 600 Gbps

Company Confidential 25 September 2000 (Slide 11 ) Switchless Switch No Performance Boundaries 40 Gbps > 500,000 data flows 600 Gbps > 7,000,000 data flows Extraordinary scalability across a single VNode Pay-as-you grow scalability Guaranteed QoS/SLA compliance

Company Confidential 25 September 2000 (Slide 12 ) SmartService™ Software Any Service IP/MPLS Virtual Private Network Virtual Router Virtual LAN Transparent LAN Frame Relay ATM, including CES Service Cross-Connect Any Port 12-Port Ch DS3 Card (N X DS0) 16-Port OC-3 Card 4-Port OC-12 Card 4-Port OC-48 Card 16-Port 10/100 Ethernet Card 8-Port Gigabit Ethernet Card 1-Port OC-192 Card 1-Port WDM Card (4 Colors)

Company Confidential 25 September 2000 (Slide 13 ) Extraordinary Scalability Interfaces per Shelf Interfaces per (7 ft) Rack Interfaces per System 10 / 100 Mbps Ethernet ,584 Gigabit Ethernet DS / 1 (via Channelized DS / 3)5,37616,12875,264 DS / ,668 OC – ,584 OC – OC – OC – Data Flows512,0001,536,0007,168,000

Company Confidential 25 September 2000 (Slide 14 ) Backplane Traditional Switch The Switchless Switch I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / CPUCPU I / CPUCPU I / FABRIcFABRIc I / FABRIcFABRIc I / I / O I / I / O I / I / O Common Control Cards Linear Cost/Performance Growth Central Switch Fabric Distributed Control & Switching

Company Confidential 25 September 2000 (Slide 15 ) DSL Links Leased Lines Cable Access Internet Access Legacy I/Fs IP/MPLS ATM Backbone Optical Domain Optical Domain The One-Hop Edge No Protocol or Speed Boundaries DS0 to OC-192 IP, MPLS, ATM, FR No barriers to the optical domain

Company Confidential 25 September 2000 (Slide 16 ) VNode Management No Management Boundaries Service Provider sees one virtualized edge node. VLAN/VPN for cost effective service deployment One-touch end-to-end provisioning

Company Confidential 25 September 2000 (Slide 17 ) GEMS™ Point-and-click, end-to-end VNode provisioning Open APIs for easy integration with existing OSS implementations Robust, comprehensive statistics for performance and SLA monitoring Call Detail Records (CDRs) to support usage-based revenue generation Customer Profile DB Other DB Existing OSS CORBA CLI CDR SNMP LDAP Performance Monitoring SecurityAccounting Fault Management Configuration Management Service Provider View WholesalerCustomer Gotham APIGotham Gateway

Company Confidential 25 September 2000 (Slide 18 ) POP Outside the Box No Geographic Boundaries VNode support across chassis, racks or POPs Expansion using high speed, industry standards Rapid deployment in new regions

Company Confidential 25 September 2000 (Slide 19 ) Backplane Traditional Switch Gotham Expansion Option I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / I / O I / CPUCPU I / CPUCPU I / FABRIcFABRIc I / FABRIcFABRIc I / I / O I / I / O I / I / I / Gotham VNode Expansion Common Control Cards Central Switch Fabric Distributed Control & Switching

Company Confidential 25 September 2000 (Slide 20 ) About the Company Founded July 1999 Located in Acton, Massachusetts Currently 100+ employees, with experience in Carrier-class networking High-speed integrated circuit design Distributed system architecture Secured $33M in 2 rounds of funding Charles River Ventures Bessemer Venture Partners Crescendo Ventures Patent pending technology Scalable switching architectures

Company Confidential 25 September 2000 (Slide 21 ) Friction-Free Networking™ Switchless Switch one-hop, network simplicity VNode one-touch service provisioning Switchless Switch pay-as-you-grow scalability POP-outside-the-box deployment flexibility Internet Backbone ATM Backbone Optical Domain Optical Domain No Compromises No Boundaries

Company Confidential 15 Discovery Way Acton, Massachusetts (978)