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As the industry moves from 28 nm CMOS to 16 nm doubling the switch capacity comes naturally for the given number of ports, the doubling of the capacity will come by moving from 25G NRZ to 50G PAM4.
In effect 50G I/O will become the lowest cost for servers interconnect as 25 GbE would require FlexE/MLG gearbox the break out the traffic. The combination of SFP56 (50 GbE) and QSFP56 (200 GbE) will deliver the lower cost per bit than CFP2 and CDFP (400 GbE) solutions. Routers and OTNs do require 400 GbE no question about it, but due to cost and availability the 400 GbE will have limited applications for the next 5 years in the data centers. We will see 50/200 GbE volume deployment in the data centers before 400 GbE!
Ghiasi Quantum LLC
On May 12, 2015, at 12:54 PM, Brad Booth <bbooth@xxxxxxxx> wrote: