100g evolution at comcast(pdf)
TRANSCRIPT
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The Evolution of a
Transport Network Presented by:
Comcast
Benjamin Vik
Principal Transport Engineer
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Today's national backbone network – 2013
• Over 58,000 km of fiber
• Colocation
– Over 450 physical sites
• Equipment
– Over 1200 transponder and photonic shelves
• Wavelengths breakout
– Core is Nx100G
– Minimal 40G on Edge for Metro & Access
– Small amount of Intra-RAN links still Nx10G
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How did we get here?
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Quick DWDM Overview
• WSS – Wavelength Selectable Switch
• ILA – In-Line Amplifier Site
• ROADM – Reconfigurable Optical Add-Drop Mux
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Background
• Goal: National network to support Comcast traffic
– Data
– Video
– Voice
• Reach: Traffic sources and destinations
– Regional networks spread across the continental US
– Internal and external partners
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The Start of an Idea: 2003-2004
• Vendor Selection Process
– Fiber
– E-LEAF/NDSF/TrueWave Classic/SMF-28
– Equipment
– Nortel (now Ciena)
– CPL (Common Photonic Layer)
» In-line Amplifier, ROADM
– OME6500 (Optical Multiservice Edge)
» Transponder
– Dispersion compensating transponders vs. non-
compensating transponders
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Time to deploy: 2004-2005
• Over 30,000 km of fiber to start
– Multiple Long Haul fiber providers as well as internal fiber
• Colocation
– Over 450 physical sites
– 3rd Party: Gateways, Amp sites, ROADM
– Comcast: Regional Touch Points
– Carrier Neutral: Edge Touch Points
• Equipment
– 400+ Photonic Shelves and 100+ Transponder Shelves
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Fire it up: 2005-2006
• Initial deployment
– 2x10G Core to Core links
– 1x10G Core to RAN Links
• Growth
– 2x10G grows to 4x10G with 8x10G projected
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Growth and the need for 40G
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Design Considerations: 2005-2006
• Built with DSCM’s and dispersion compensating electronics
– DSCM’s didn’t allow max potential reach of the
transponders
• Built with C/L Band splitters to “future proof”
– L Band never materialized
• Additional future-proofing plans were made
– Raman amplified spans were selected
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Never stop moving: 2006-2009
• 2006 sees the start of the evolution
– Core to Core goes Nx40G (OC768)
– Core to RAN stays Nx10G
• Raman is introduced into the network on select spans
• Introduced “Integrated DWDM Optics” (on the router card)
into the network
• 100G trial on production network – March 2008
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Design Considerations: 2006-2009
• Integrated Optics
– Reach
– Dependency on Dispersion Compensation
• Deploying 40G on a network optimized for 10G
– 40G Transponder solution arrives 2008
– Improved reach, fewer regens
– Differential provisioning
• YoY BW growth
– Pushing to the edge of technological capabilities
– 100G is a must for our future
– Network preparation needed to allow for 100G
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The Need for 100G
0
200
400
600
800
1000
1200
1400
1600
2005 2006 2007 2008 2009 2010 2011 2012 2013
BW (Gbps)
Sample long haul span between cities
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Clean-up: 2010-2012
• Remove DSCM’s (Dispersion Compensation Modules)
– 2 Year Project
• More Migration
– Core to Core goes to 100G (2012)
– Core to RAN goes to 40G
• Thin OADM (TOADM) to ROADM
– 2 Year Project
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Design Considerations: 2010-2012
• Database Replication Service (DBRS)
– OSPF used for inter-shelf topology awareness, but
Network is growing too large for a single OSPF area
• 100G improves reach with the help of RAMAN
• Network gets optimized for 40G and 100G
– Some 10G still present in network
• Preparation for 100G required on going maintenance on
the production network
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Present Day: 2013
• TOADM to ROADM at the edge
• Migration continues
– Continued upgrades of Nx100G Core to Core
– Core to RAN goes to Nx100G
• Network expansion
– New routes, new vendors, new builds, new partnerships
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The Future: 2014 and beyond
• All RANs go Nx100G
• 400G/1T
– Looking for it now
• Colorless/Directionless
• Expanded reach
– New fiber allowing fewer amp sites
– Submarine type abilities for a terrestrial application?
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Thank You