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Dear 100Gb/s 100 Gb/s per lane optical PHYs Study Group Participants, After the conclusions of yesterday’s presentations, I had a conversation with Mark Nowell about some of the differences in perspective that come into play with respect to rate designations and rate counting.
Mark pointed out that to a System Vendor, what matters is the total port bandwidth, and how it’s partitioned is simply a configuration issue because switch ASICs behind the port support full range of MAC rates
(with some limitations for the lower MAC rates). To a host card that has 32x QSFP-DD or OSFP slots, with a 12.8T switch ASIC behind it, the only count that matters is 32x 400G ports. To a module vendor, the optical port rate because that’s what defines how the module is build. A 400GbE FR4 module is different than 2x200GbE FR4+ module, and from 4x100GbE module. With the use of high density
LCs, this is becomes more important. To a network architect all that matters is the MAC rate. Everything that is near and dear to our hearts is just one line on a network graph, and what matters about that line is the rate and supported radix. As a result, the presentation discussing rates has been updated with a comment about perspective.
http://www.ieee802.org/3/100G_OPTX/public/Mar19/cole_optx_01c_0319.pdf#page=5 Going forward, when citing volume, we should be careful to describe what is meant by cited numbers; 1) total system port or total module bandwidth, i.e. xAUI bandwidth, or ) optical port rate or MAC rate.
This way anyone looking at the numbers will know how it relates to what they are working on. Thank you Chris From: Mark Nowell (mnowell) <00000b59be7040a9-dmarc-request@xxxxxxxxxxxxxxxxx>
Reminder See you tomorrow Mark On 3/11/19, 1:42 PM, "Mark Nowell (mnowell)" <mnowell@xxxxxxxxx> wrote: Dear Colleagues, We’ll be starting @ 8:30am on Wednesday morning. We’re in the Waddington Conf room which is the same one that .3cm (400G Multimode) is using on Monday and Tuesday Mark To unsubscribe from the STDS-802-3-100G-OPTX list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-100G-OPTX&A=1 To unsubscribe from the STDS-802-3-100G-OPTX list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-100G-OPTX&A=1 |