Check out Niall Robinson’s slides from his IHS webinar on data center interconnectivity trends

1. Data Center Interconnectivity Trends and
Their Effect on Optical Networking
Niall Robinson, VP Global Business Development
June, 2015

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• What’s Hot and What’s Not when it comes to Data Center
Interconnectivity?
• Not including SDN as that’s already been covered in other
presentations!
• Is DCI really different from traditional optical transport?
• DCI use cases and deployment examples
• Where does the DCI market go from here?
Content

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• Traditional telecom shelves
• Vendor lock-in of any kind
• Backplane connectivity
• OTN
• TL1
• NMS
• 15-20 year equipment lifetime
• NEBS-type environmentals
• Small footprint but scalable
• Low power dissipation
• Open interfaces
• Optical AND management
• QSFP28 clients
• BYO client pluggable optic
• Encryption
• Simple install and config.
• Minimize SKU’s
Data Center Interconnectivity

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• Inefficient space usage for smaller
capacity deployments
• Issues at colo sites where space is a
premium
Size Matters: The Goldilocks Zone
Too Big
Too Small
Just Right • Maximizes capacity usage regardless
of deployment size
• Fits even the smallest colo sites and
scales to the largest deployments
• Fits colo sites well but doesn’t scale
efficiently for the largest deployments
• Non-optimized power management
>4RU
2RU
to
4RU
1RU
to
2RU

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Open Optical Line System
5.6 Tb/s
16 Tb/s
51.2 Tb/sPerformance indicators
• Equipment density
• Power efficiency
• Fiber capacity
• Programmability

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Is DCI Really Different?

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Datacenter Interconnect Architectures
global
extension
global
extension
Metro connectivity:
• Data center distances < 100km
• Predominantly Ethernet
• Point-to-point DWDM (low latency)
Long-haul connectivity:
• Globally distributed data centers
• Predominantly Ethernet
• Reconfigurable optical layer
• Open Optical Layer

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• Two customers, the same size, same business segment:
• Customer #1: I really only need about 1 Terabit between my Data Centers
• Customer #2: I want 400 Terabits between my Data Centers, and I want it today
• Why the difference?
• #1 uses local compute clusters with replication and load balancing between them
• #2 wants localized compute clusters to behave as global cluster
• Amdahl’s lesser known law:
• In parallel computing, interconnect must equal compute
• E.g. 1Mbit/s I/O for every 1MHz compute
A Tale of Two Cloud SPs
8
Customer
#1
Customer
#2

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DCI Use Cases

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Smaller
Edge Sites
Mega Data Center
Need High
Channel Counts
Need Open API’s
Need Big Capacity
for Data Centers
Need Efficiency
Must scale from 10G to 100T
Data Center Interconnect Needs
REST
CONF
NET
CONF
CLI REST
Co-Lo Sites
Need Small
Form Factors
For Co-Lo’s
Need Open
Line Systems

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Use Case Example 1
High Capacity Connectivity w/ Open Optical Line System

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Where Do We Go From Here?

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Coherent Modulation Limits
OSNR Penalty
2500km
600km
<100km
???
• 4QAM (QPSK) is current coherent
baseline
• 16QAM enables metro and regional
links
• 64QAM potentially applicable to
shortest point to point links
• 128/256 QAM not currently applicable
2
minD
P
OSNR
avg
req ∝
D = the distance separating
constellation points
ChannelRate
(Gbit/s)

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• Open Line Systems, both optical and management!
• Greater spectral efficiency
• New modulation techniques
• Always moving to best CMOS node for lowest ASIC
power dissipation
• Further optical/opto-electronic integration
• Integrated optical engines / integrated optics & electronics
• Raman plus other optical technologies to maintain
distance & improve flexibility / resilience
• Continue to optimize space, cooling and security
solutions
• Both data center physical design AND equipment design
• Continued push for removing vendor / technology lock-in
DCI Futures

15. Thank You!
Niall Robinson
Vice President
Global Business Development
Phone: +1 972 759 1262
Fax: +1 972 759 1201
Mobile: +1 978 933 1081
nrobinson@advaoptical.com
ADVA Optical Networking NA Inc.
2301 N. Greenville Avenue
Suite 300
Richardson, TX 75082
USA
www.advaoptical.com