I agree there is a lot of merit to standardize 200G as a partner with 50G serial IO and continue the factor of 4 down / uplink – especially given that the SI
and module challenges seem relatively do-able.
One additional thought – if we agree that 50/200 makes sense, would it follow that 100 / 400 would also pair up? That would enable a two lane twinax DAC server
interconnect paired with a 400G uplink. The 400G would be already covered in .bs, and the 100G may “come for free” with 200G, just less lanes?
So it would seem in my opinion that 50, 100 and 200G based on 50G IO would be relatively mainstream PMDs, and would merit discussion for inclusion (at the risk
of project overload!).
Thanks
Rob
From: Vineet Salunke (vineets) [mailto:vineets@xxxxxxxxx]
Sent: Thursday, May 07, 2015 4:03 PM
To: Chris Cole;
Cc: Vineet Salunke (vineets)
Subject: RE: [802.3_DIALOG] Future 50 Gigabit Ethernet CFI
And 50G SFP / 200G QSFP for Ethernet will have nice alignment and re-use with Fiber Channel roadmap for 64GFC SFP / 256GFC QSFP ….
--vineet
From: Chris Cole [mailto:chris.cole@xxxxxxxxxxx]
Sent: Thursday, May 07, 2015 3:33 PM
To: STDS-802-3-DIALOG@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_DIALOG] Future 50 Gigabit Ethernet CFI
Ali,
These are great examples.
Standardizing 50G and 200G PMDs will continue the successful progression of single and quad channel devices for high volume datacenter applications.
|
Per lane rate Gb/s |
Single lane rate Form factor |
Quad lane rate Form factor |
Quad data rate Gb/s |
|
10 |
SFP+ |
QSFP+ |
40 |
|
25 |
SFP28 |
QSFP28 |
100 |
|
50 |
SFP56 |
QSFP56 |
200 |
Another great example of multi-lane 50G technology application was cited in your SMF Ad Hoc presentation survey of relevant papers from OFC 2015.
http://www.ieee802.org/3/bs/public/adhoc/smf/15_04_28/ghiasi_01_0415_smf.pdf#page=11
In this post-deadline paper Cisco authors presented a 2x50G PAM-4 (optical) 100Gb/s QSFP28 transceiver using Cisco 50G PAM-4 optics and Broadcom 50G PAM-4 (line
side) PHY. Measurement results were for 10km SMF and 100m OM3.
Chris
From: Ali Ghiasi [mailto:aghiasi@xxxxxxxxx]
Sent: Thursday, May 07, 2015 2:45 PM
To: STDS-802-3-DIALOG@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_DIALOG] Future 50 Gigabit Ethernet CFI
John
I see opportunity for full spectrum of PMDs for both 50 GbE and 200 GbE including popular break out option with combination of QSFP56 and SFP56:
- CR
- KR
- MMF
- SMF PSM4/FR/LR
On May 7, 2015, at 1:31 PM, John DAmbrosia <John_DAmbrosia@xxxxxxxx> wrote:
Mark,
I would like to request clarification of your stated intent below. You state the CFI will focus on single lane 50Gb/s Ethernet. While I realize you are initiating
this effort – in my opinion the discussion that I am seeing happen is essentially “n” by 50Gb/s per lane with 50GbE and 200GbE being discussed.
As this is a consensus building process, will you be allowing interested parties to bring presentations forward to state justification for why 200GbE should
also be considered? Based on my conversations, I believe there are a number of individuals who would like these topics discussed together.
Could you also provide any more insight into what you are proposing for single lane 50GbE? Will this be like the .3by project – Backplane, Cu Twin-as, and
MMF? Or is that a TBD in your mind that you hope to address during consensus building?
Thanks in advance for your answers.
Regards,
John D’Ambrosia
From: Mark
Nowell (mnowell) [mailto:mnowell@xxxxxxxxx]
Sent: Thursday, May 07, 2015 10:53 AM
To: STDS-802-3-DIALOG@xxxxxxxxxxxxxxxxx
Subject: [802.3_DIALOG] Future 50 Gigabit Ethernet CFI
Dear Colleagues:
I wanted to let everyone know that a number of people have started preliminary discussions that would lead towards having a Call-for-Interest on the topic of single lane
50 Gigabit/s Ethernet at a future plenary meeting of 802.3. If anyone is interested in helping and contributing, please let me know or talk to me In Pittsburgh. As we get further along, we will be sharing some of the plans and data we are gathering to support
the CFI.
Regards,
Mark