Data Center Interconnect and The Optical...
Transcript of Data Center Interconnect and The Optical...
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John Reynolds
Data Center Interconnect and
The Optical Layer
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• Industry Trends – Growth
– Traffic Variability
• Disaggregation and Open Line Systems
• Subsea and Terrestrial Convergence
Agenda
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• Typical 500,000 sq/ft web-scale DC requires ~8,000 100G WAN ports (Ovum)
• Workloads are driven by Application and Time of Day events
• Variability of transport traffic is increasing as is the range between the largest and smallest flows
• Transport Networks must become more agile
– Provide higher-bandwidth
services
– Turn up services faster
– Lower cost
Growth of DCI and its effects on Transport Networks
Global DCI traffic growth
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2013 2014 2015 2016 2017 2018
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Source: Cisco Global Cloud Index, 2013–2018
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Nature of IP Traffic….highly variable
Examples: Database Mirroring, VM Migrations, “elephant flows”….
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Evolution of the Optical Layer and
Open Line Systems
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Industry Direction
• Data Center industry has been pushing and deploying “Open” systems for years
– Separation of Control and Data planes (I.E. SDN) Open management
interfaces
– Software control and network programmability
– White box switches
– Focus is now turning to the WAN space
• Transport DCI
• Large Data Center operators are beginning to push for this model already
– E.G. Telecom Infra Project (TIP) – Facebook / Intel
Open Systems
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• Modeled after the Open Compute Project (OCP) created by Facebook for the data center and server industry…
• Introduction of Open Packet DWDM model – Routers
– Transponders
– Open Line System
Telecom Infra Project (TIP)
“The Telecom Infra Project (TIP) is an engineering focused initiative driven by
operators, infrastructure providers, system integrators, and other technology companies that
aim to reimagine the traditional approach to building and deploying telecom network
infrastructure”
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What is an Open Line System?
• OLS implies integrated management of both the Line System and Terminal equipment via an open Northbound Interfaces (NBI) and under SDN control • E.G. Netconf/Yang
Vendor A Terminals
Vendor B Line System
SDN Controller ”Orchestrator / Hypervisor / etc.”
NBI NBI
• Much more than just alien waves….
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IP and Optical Transport
• Unified network orchestration tightly couples IP traffic demands and variability to Transport resources for more effective utilization • Time of day events • Route or latency sensitive workloads
Vendor A Terminals
Vendor B Line System
SDN Controller ”Orchestrator / Hypervisor / etc.”
NBI NBI
NBI
Routers
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• Best of breed philosophy – Separates development lifecycle of Transponder vs Line System technologies
– No longer coupled, advancements can be introduced to the network faster
• Line System – Capacity
– Reach
• Transponder – Best transmission format for application
– Power/Capacity/Rack metric
Disaggregation
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• Current C-Band technologies won’t be able to satisfy the bandwidth demands coming from the data center.
Maximizing Capacity
EDFA 36nm
Raman 61nm
Raman+ 100nm
Line System
Data Center/CO Nearly 3x the usable spectrum of EDFA
Xtera Raman Amplification…..not just for reach!
…but for increased the usable spectrum
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Open Line System for Flexibility of Transport
MUX / DEMUX 50Ghz 37Ghz
Coupler Amplifier EDFA
EDFA (C+L) EDFA+RAMAN
All RAMAN
Advance Modulation 100G+
Spectrum Sharing (multi-vendor)
Direct Detection PAM-4
Switch/Router Coherent Detection
100G
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Terrestrial and Subsea Convergence
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• Technology has converged dramatically over the past few years… FEC, coherent, modulation format...
• Optical transmission is fundamentally the same. Actually, tranmission is easier over a wet fiber plant:
– Uniform fiber type/vintage
– Uniform span length
– Zero optical connector loss
Are Terrestrial and Submarine Fundamentally Different?
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What does this convergence mean?
• Elimination of back to back systems at landing station….reduced cost
• Common Platforms – Unified practices for engineering, maintenance, and support
– Common spares
Terrestrial and Subsea Convergence
POP/DC
LTE
SLTE
LTE
SLTE
LTE
LTE
POP/DC Cable Landing Station Cable Landing Station
Terrestrial Submarine Terrestrial
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One example implementation
Terrestrial Submarine Terrestrial
POP/DC
PFE/LME
LTE
LTE
POP/DC Cable Landing Station Cable Landing Station
• Glass through for POP to POP connection
ROADM ROADM
PFE/LME
• But more than that…. Unified Global Network Management / Enablement of new SDN Services
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Principle of Open System Gateway
• Separate supply of Terminal, PFE, Cable & Repeaters
• Independent fiber pair Monitoring and Control
• Can use any terminal equipment with suitable performance (SLTE or LTE)
• Separation of development lifecycles..
Open System for Subsea
LME
PFE NMS
3rd party
Terminal
OSG
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• Optical Layer must evolve to keep pace with DCI traffic demands and changing patterns
• Open Line Systems enable change – Providing maximum spectral density and bandwidth headroom
– Separation of development lifecycles…speeds up delivery of technology
advances to the network
• Convergence of terrestrial and subsea is happening now… – Network boundaries and silo’s can be eliminated.
– DCI, LH, Subsea…...who cares?.....its all one network
Summary
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Thank you