Analysis of Network Bandwidth Efficiency for Next Generation 100Gb/s WDM Architectures

Transcription

1 Analysis of Network Bandwidth Efficiency for Next Generation 100Gb/s WDM Architectures Slide: 1 The Paper Analysis of Network Bandwidth Efficiency for Next Generation 100Gb/s WDM Architectures Geoff Bennett, Satyajeet Ahuja, Steven J. Hand, Chris Liou, Vijay Vusirikala and Serge Melle Slide: 2 1

2 IP and Transmission Network Architecture Routed dip Layer Optical Transmission Layer Slide: 3 The Typical Bandwidth Growth Chart Doesn t Tell The Whole Story Petabits added per year r New BW in Worldwide Long Haul Networks End to end circuits drive this bandwidth growth What types of circuits comprise this bandwidth???? Source: Ovum Slide: 4 2

3 End to End Circuits Circuit Mix & Bandwidth Growth (Typical Long Haul Network) 2.5G GigE G 10G Bandwidth Growth 2.5G 2012 GigE 40G 10G Wavelengths 10G based (800G 1.6T capacity) Source: Network data from Infinera long haul customers 40G based (3.2T 6.4T capacity) Slide: 5 Building Blocks of the Transmission Network Network Element B/W Management ODXC ODXC ODXC High cost ROADM ROADM ROADM No B/W management MSPP MSPP MSPP Not enough capacity Slide: 6 3

4 When Service Speed = Wavelength Speed, Efficiency is Maximized Chicago New York 10GbE 10GbE 10G λ ROADM Network 10G λ Cincinnati OC 192 a.k.a. Dumb pipes OC gigabits of revenue; 20 gigabits of cost more or less.however all optical ROADM networks typically incur 10 20% inefficiency due to wavelength blocking Slide: 7 When Service Speed < Wavelength Speed, Dumb Pipe Networks become Inefficient Chicago New York 2x10GbE 40G λ ROADM Network 2x10GbE 1x10GbE 40G λ a.k.a. Dumb pipes Cincinnati 1x10GbE 30 gigabits of revenue; 80 gigabits of cost Slide: 8 4

5 Typical ROADM/WDM System Architecture O E O λ 1 λ N λ 1 λ N All optical pass through express traffic O E O O E O λ 1 λ N λ 1 λ N O E O λ i, λ j WDM Terminals Transponders & Muxponders Services nailed up to waves No switching, no grooming It s just dumb, point point waves Add/Drop λ i, λ j local traffic ROADMs Switching of photons only No grooming within or between waves No digital functionality Wavelength blocking strands waves Muxponder inefficiency + wavelength blocking = CapEx tax Slide: 9 Digital ROADM: Integrated Bandwidth Management Infinera DTN System Architecture DLM DLM West Line Fibers Optical Band Mux Tx Rx : Tx Digital Electronics & Software Digital 3R and PMs Switch / Mux / Groom Digital Protection Rx Tx : Rx Optical Band Mux East Line Fibers Rx Add/Drop Tx DLM DLM 40Gb/s 10GbE 2.5G GbE Local Add / Drop Services Add or drop any service at any node at any time Slide: 10 5

6 An Example of this Architecture: Integrated DWDM + OTN Switching 10G Ethernet DTN Digital ROADM 2.5G SDH 40G Ethernet 100G Ethernet Multi Degree ODU1s per λ 100Gb/s pool of bandwidth per line card (40 ODU1s) Number of λs Service Ready Capacity 160 channel WDM km ULH reach ODU1 Bandwidth Management Virtualized Bandwidth Slide: 11 Bandwidth Virtualization: From node view to network view Bandwidth Management Enhances Network Efficiency Without Bandwidth Virtualization, Capacity becomes stranded Muxponder inefficiency strands sub λ bandwidth Wavelength Blocking strands wavelengths on spans Used capacity Constrained capacity Flexible capacity With Bandwidth Virtualization Bandwidth management allows full capacity to be used for services Wavelength conversion at every node Dynamic Pool of Bandwidth Service demand Service demand Colorless BW Slide: 12 6

7 s Make Bandwidth Management Viable s: Cost effective OEO Conversion Integrate digital electronics into the optical system Slide: 13 Dumb Pipe Tax Means Capital Inefficiency Large N. Am. Network Model: 33,084 route km About 50 Tb/s of customer demand Total Networ rk Bandwidth (Terabits) % 33% 50% Infinera 40G Dumb Pipe 100G Dumb Pipe Wasted or Stranded Bandwidth Revenue Bandwidth Slide: 14 7

8 Photonic Integration: Enabling Economical Integrated Switching + WDM Traditional DWDM: > 60 components 10 x 10G Infinera: A pair of s Photonic Integration 10 x 10G technology provides: Higher Density/Lower Power Higher Reliability Affordable Digital Switching Service Ready Capacity Infinera really does stand alone in large scale opto electronic integration today, with a that could very well have an astounding lead time of four years over the rest of the optical industry. Sterling Perrin, Heavy Reading Slide: 15 Detailed Network Planning Results Slide: 16 8

9 Impact of Network Efficiency Metro Core Network Typical metro core ring Sub tending access rings 2.5G services over 10G waves Slide: 17 Sensitivity Analysis: 2.5G Demands Number of Incremental OEO deployed # of Deployed OEO OEO's Deployed 2.5G 4:1 Muxponder OEO Total OEO (WSS) Total OEO (ROADM) Digital ROADM: 4 port 2.5G I/F OEO premium due to wavelength conversion OEO premium due to pt pt muxponder inefficiency no ability to do grooming across multiple lambdas # of 2.5G Demands Slide: 18 9

10 Impact of Network Efficiency Metro Core Network Typical metro core ring Sub tending access rings 2.5G services over 10G waves Regional/LH Network Typical regional/lh collector 10G services over 40G waves Only 69% efficient Slide: 19 Network Efficiency Study: Regional/LH Collector Network Topology Modeling Parameters Nationwide US network 71 nodes & 85 links 686 real life traffic demands (10G services) Bandwidth Virtualization (with 100G DWDM layers) 40G Muxponders (4 x 10G) fficiency Normalized Bandwidth ef Bandwidth Utilization Conventional based Bandwidth Architecture Virtualization (4 x 10G Muxponder) Muxponder architecture is 25% less efficient than Bandwidth Virtualization architecture Slide: 20 10

11 Impact of Network Efficiency Metro Core Network Typical metro core ring Sub tending access rings 2.5G services over 10G waves Regional/LH Network Typical regional/lh collector 10G services over 40G waves ULH Network Typical nation wide ULH ntwk 10G services over 100G waves Only 69% efficient Only 75% efficient Slide: 21 Muxponder Efficiency Gets Worse at 100G 100% 90% 80% 70% Network Efficiency 60% 50% 40% 30% 20% 10% 100G Bandwidth Virtualization 100G Muxponder 100G Bandwidth Virtualization (Incremental Planning) 0% Y1 Y2 Y3 Y4 Y5 100G Muxponders are highly inefficient for 10G services for first few years. Bandwidth Virtualization enables high efficiency at all fill factors Slide: 22 11

12 Impact of Network Efficiency Metro Core Network Typical metro core ring Sub tending access rings 2.5G services over 10G waves Regional/LH Network Typical regional/lh collector 10G services over 40G waves ULH Network Typical nation wide ULH ntwk 10G services over 100G waves Only 69% efficient Only 75% efficient Typ 48% efficient Integrated Bandwidth Management delivers efficiency gains of 33% 100% Slide: 23 Conclusion Our study shows significant efficiency gains by the use of integrated bandwidth management From 33% to 100% improvement, depending on topology But typical ROADM devices do not have Integrated B/W Management MSPPs lack capacity, ODXCs are too expensive The key enabler for the integration of B/W Management is Photonic Integration GMPLS can then allow local B/W Management to extend across the network Bandwidth Virtualization Slide: 24 12