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Economic Viability Study of Network Solutions at NOBEL WP2 Meeting, Valladolid, October 2004

This study evaluates economically viable network solutions presented at the NOBEL WP2 Meeting in Valladolid, October 2004. It explores the optical layer's economic interest, multi-layer connections with scenarios for short-term SDH switching and WDM, and medium-term OXC solutions. Key considerations include router CPU load, QoS enhancements, and optical transport bandwidth. The study also delves into virtual topology modeling, simulations using various traffic types, and presents financial insights on VC-4 granularity savings in network interfaces and routers, concluding with the future interest in 10Gb lambda switching.

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Economic Viability Study of Network Solutions at NOBEL WP2 Meeting, Valladolid, October 2004

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  1. Subactivity 2.3: CAPEX Evaluation Study of economically viable network solutions NOBEL WP2 Meeting, ValladolidOctober 2004

  2. Study of economically viable network solutions • Goal • Economical interest of Optical layer pass-through • Economically viable solution to interconnect multi-layer network equipment. • Scenarios • Short term : DXC (SDH switching) and WDM point to point • Medium term : OXC (lambdas switching) • Overlay model NOBEL WP2 Meeting, ValladolidOctober 2004

  3. Interests of optical Layer pass-through • Technical aspects : • Bypass L2/L3 equipment • Decrease the loading's level of router's CPU • Improve QoS (congestion, …) • Flexibility • Protection and Restoration • But optical bandwidth ? • Economical aspects : • Number of ODXC-router interfaces • Loading's level of router's shelf and cross-connect's shelf • But Optical transport bandwidth ? NOBEL WP2 Meeting, ValladolidOctober 2004

  4. Architecture and techno-eco. scenarios IP Layer connectivity IP Router – SDH OXC interfaces Hierarchical IP Layer Optical layer Architecture NOBEL WP2 Meeting, ValladolidOctober 2004

  5. Architecture and techno-eco. scenarios S3 S1.1 S1.2 S4 S2.1 S2.2 IP Layer transit IP Router – SDH OXC interfaces Hierarchical IP Layer Optical layer Architecture NOBEL WP2 Meeting, ValladolidOctober 2004

  6. Core network description 2.5G or 10G WDM Links NOBEL WP2 Meeting, ValladolidOctober 2004

  7. Virtual Topology Builder • Simulation Inputs • 10 nodes network, 16 links (1.9 avg. connectivity) • Symmetrical & Uniform matrix, statistical multiplexing capable • Three traffic Types • Web (mr = 64kbps, std = 57kbps) • High Quality MPEG4 (mr = 770kbps, CoV = 0.79) • Voice (mr = 64 kbps, std = 0 kbps) • VC4 as transmission and switching unit • Simulation process • Iteratively search and select the best node pairs between which will be aggregated the traffic • Decision criteria based on port cost gain. • Shortest path traffic routing NOBEL WP2 Meeting, ValladolidOctober 2004

  8. Virtual Topology Builder • Simulation outputs • The virtual topology , i.e. the set of connections to establish between the router pairs through the transport network. (in red) • Dimensioning information of both the virtual topology and the transport network. • Almost full meshed connectivity selected as optimum due to the small granularity used in the transport network • Good filling ratio of VC-4 so almost no multi-hopping required NOBEL WP2 Meeting, ValladolidOctober 2004

  9. Economical results • VC-4 granularity : • Network interfaces : No savings • Router/ODXC interfaces : 2 to 7 % savings in Full optical pass through • VC-4-16c granularity : • Network interfaces : 5 % savings in IP transit scenario • Router/ODXC interfaces interfaces : 3 % savings in Full optical pass through • Fibers : No savings (32 lambdas systems) NOBEL WP2 Meeting, ValladolidOctober 2004

  10. VC-4 granularity : Statistics NOBEL WP2 Meeting, ValladolidOctober 2004

  11. VC-4-16c granularity : Statistics NOBEL WP2 Meeting, ValladolidOctober 2004

  12. First conclusions • IP Transit : Best utilization of optical transport Bandwidth • Increase X-Connect switching granularity  increases interest of IP Transit • Increase IP/DXC interface bit-rate  reduces interest of optical pass-through • L2 IP Router/DXC interface functionalities • Best utilization of bandwidth between IP Router and DXC • Reduces interest of optical pass-through • Next scenario : 10Gb lambda switching NOBEL WP2 Meeting, ValladolidOctober 2004

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