SC11: Error Free Transport - Kim Roberts

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SC11: Error Free Transport - Kim Roberts

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Ciena's Kim Roberts on the use of forward error correction (FEC) and Soft-FEC to enable completely error free high-speed optical transport networks.

Ciena's Kim Roberts on the use of forward error correction (FEC) and Soft-FEC to enable completely error free high-speed optical transport networks.

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  • 1. What can You do with anError-Free 100G Pipe?Kim RobertsNovember 2011© Ciena
  • 2. A Big Pipe, Anywhere You Want  100G coherent is now ubiquitous. Transoceanic 100G, and regional 400G end 2012 / early 2013  Wavelength Selective Switching 2 © Ciena
  • 3. Zero Packet Loss Forward Error Correction (FEC) Does not require retransmission 5 to 40 ms FEC delay at 100G Predicted bit error rate <10-20 Can expect random packet loss rates ~ 10-14 Memory faults, RAID errors, etc are more probable. Packets can still be lost due to equipment failure or fiber cuts Switch availability of 99.9999% Typical fiber route has 2 cuts per year per 1000 km Fix the calculation if you lose one packet! 3 © Ciena
  • 4. Minimum and Constant Latency Minimum physical path length no satellite connections, a direct fiber route. no dispersion compensating fiber coils, at 50 ms per coil. Minimum Buffering Layer 1 connection, with no packet queues. FEC rather than ARQ, so no ARQ buffer delays Zero Jitter Physical layer jitter is minimal No queuing jitter4 © Ciena
  • 5. Eliminate the Remaining Bottlenecks Network Interface Card? TCP Obsolete! Create protocols designed for these pipes Zero random packet loss, jitter, out-of-order packets Very large number of packets in flight 500 MBytes in one round trip time Handle line faults and storage faults What can you accomplish with full 100Gb/s transfers? 1 PB/day for your application!5 © Ciena