Physical Infrastructure trends and evolving certification requirements for Datacenters Ravi Doddavaram

Transcription

1 Physical Infrastructure trends and evolving certification requirements for Datacenters Ravi Doddavaram

2 Agenda Market Market Trend and Trend business and and business case for case higher case for higher for speeds higher Benefits speeds and Challenges in migration to new standards Benefits and and Challenges in migration in migration to new to new Limits standards on Physical infrastructure Certification Limits on challenges on Physical for infrastructure the new physical layer infrastructure Certification challenges for for the the new new physical physical layer infrastructure

3 Moving towards Higher Speeds Demand Increased Users Broadband, NBN penetration Increased Access rates Multiple Access schemes, Wi Fi, FTTH, LTE Source: Psiber Data Pte Ltd Increased Services Social Media explosion, Content on Internet Massive data requirements due to video traffic Broadband, NBN penetration Increased Access rates

4 How are we getting there Adoption Change in Data Center Topology LOM Integration of 10G, Cost benefits Upgrading existing standards IEEE AD The TIA 942-A Standard Physical layer infrastructure upgrades tion Change in Data Center Topology LOM Integration of 10G, Cost benefits Upgrading existing standards IEEE AD The TIA 942-A Standard Physical layer infrastructure upgrades

5 Access Topologies before 2010 Not Interesting >1G (multiple standards) <100 Mbps Gbps

6 Access Topologies Still Not Interesting 40 Gbps (LOM) or LAG 10 Gbps(LOM) Virtual NICs push bandwidth requirements on Servers/Access

7 Other Topologies (Fabrics) Source: Jonathan Jew, J&M consultants

8 Why not existing standards? Source: HSSG, IEEE ba IEEE Ad (LAG) Supports L2 Link aggregation 4 x 10 Gbps links Independently managed channels Scalable Widely used ( due to unavailability of alternative) Disadvantages over IEEE 802.3ba (40Gbps) Slower networks, high latency Especially for LAN/SAN convergence Higher cost of management due to port count Higher cost per port ( No LOM option) Load balancing is inefficient

9 TIA 942-A Standards update Parameter TIA 942 TIA 942-A ISO/IEC Cabling (back bone and horizontal cabling) CAT 3 to CAT6a OM1, OM2 OM4 CAT6, CAT6a OM3, OM4 ISO Class Ea OM3(min. requirement) Length (HC) 100m for copper 300 m w/o HDA on Fiber 100m for copper Application specific length requirement (TIA 568 C.0) 100m for copper Channel restrictions OF m OF m Connectors No requirement LC, MPO LC, MPO Topology MDA->HDA->EDA MDA->IDA->HDA- >EDA MD->ZD->LDP Source: Psiber Data Pte Ltd

10 Physical Layer Infrastructure Fiber or Copper: Depends of the datacenter layout End of Row (Cost efficient, SCS) Top of the Rack (Scalable Design, Large Scale Datacenters) Declining Cost of 10G BASE-T Depends on equipment connected to Access layer Connected to PCs, other CPEs, Wi-Fi Connected to Servers Flexible connections upto 4 connectors in a channel Source: The Siemon Company

11 Physical Layer Infrastructure Achieving 40 Gbps on Fiber Use of Parallel Optics through QSFP connectors and MPO arrays IEEE 40G BASE-SR4 Mostly Multi-mode preferred for Datacenter applications TIA 942-A requires use of OM3 Fiber Needs 8 ports of the MPO array

12 Certification Issues in MPO Polarity Issues Three types of MPO cords in the market Type A, Type B, Type C Certifying to TIA/ISO standard puts a limit on number of connectors Insertion Loss/Connector specification Maximum permissible loss of 1.9 db Loss of 0.75 db per connector makes only two connectors per link possible The new IEC Ed 2.0 (2012) (yet to be ratified) Specifies 3 jumper reference as the default test method One jumper method only applicable for Permanent Links

13 Certification for Multimode (OM3) Fiber Limiting Factors of OM3, OM4 Fiber Differential Modal Delay Attenuation over long distances Attenuation still the primary certification metric OTDR is mostly for OSP (Outside Plant applications)

14 Encircled Flux Compliance Required by ISO AMD2 document Requirement on Light source for Multimode certification Similar function as a mandrel but more precise using a Mode-Conditioner Now TIA is also adopting it What is Encircled Flux? Measurement of light coupled to a MM Fiber as a function of offset from the core Measurement Sources need to fall into the EF template

15 Copper Infrastructure for High Speed Achieving 40Gbps in copper Distance For < 7m Standard exists (CR4) (used within Racks) Evolving CAT8 Standard.(>50m, capable of EoR) 2000 MHz Bandwidth Field Testing feasibility, is accuracy enough?

16 Upcoming CAT8 Standard Highlights of the standard Likely to be available by 2015 Will most likely use an RJ45 connector Supports 40m of 40GBASE-T Specified till 2GHz Primarily targeted at Datacenter markets with smaller channel length requirement Channel limits are already defined RL about 6 db at 2GHz Insertion Loss 54.4 db at 2GHz NEXT (To be defined) Please note that this is for information only, the standard is not ratified yet.

17 Certification Requirements Frequency of Testing Should be capable of certifying cables up to 2GHz (at least) Accuracy of Field Testing Accuracy should be specified till 2GHz Current document of IEC specifies 600 MHz Draft of 1000 MHz in progress and to be ratified by 2014 Strong Correlation of all parameters like NEXT, RL with Lab. Instruments (such Testers are already available in the market)

18 Certification Requirements Typical Return Loss measurement for 2GHz

19 Certification Requirements Typical NEXT measurement for 2GHz Field testing till 2GHz possible today Demonstrated accuracy with laboratory grade equipment

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