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I support Brad’s comments. I’d also add that before we address 200G, can we go back and address 100G serial so that eventually we can have a 4by100 solution for 400GE? I think that would be a better use of time.
As it is …
We have to complete the 2.5ish GE stuff, the baseT stuff that Dave is driving, Mark’s 25GE stuff, John’s 400GE stuff … and now a cfi looking at 50gbps … this is a lot of work and I think we have to be careful where we put our time. 50gbps MAC rate makes sense … 100gbps serial rate make sense. But I argue that 200gbps may not be that useful. What do you think we gain from it that 50 by itself or 100 by itself would provide?
From: Ali Ghiasi <aghiasi@xxxxxxxxx>
Reply-To: Ali Ghiasi <aghiasi@xxxxxxxxx>
Date: Tuesday, May 12, 2015 at 2:28 PM
To: "STDS-802-3-DIALOG@xxxxxxxxxxxxxxxxx" <STDS-802-3-DIALOG@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_DIALOG] Future 50 Gigabit Ethernet CFI
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: