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Hi Ali, 发件人: Ali Ghiasi [mailto:aghiasi@xxxxxxxxx]
Mike/Chris/Steve/John As one of the people that has been proponent of 50 GbE/200 GbE for one year, if we are not careful as Mike mentioned 802.3bs could end up getting delayed by a year+. The 400 GbE will be deployed 1st in the Routers/OTN
applications as soon the 802.3bs is stable, this market segment will happily deploy CFP8. The 50GbE/200GbE is needed for next cycle of data center deployment based on 32 ports of QSFP56 or 6.4 Tb front plate capacity. The development of these type of SOC typically has long envelopment cycle and if we can
provide clarity on logical/PCS implantation of 50 GbE/200 GbE it will be a great service to the industry. We should definitely not try to define any 50/100/200 GbE optical PMD in the 802.3bs no matter how trivial the implementation you believe it is, as we
have seen with 100 GbE the market was more efficient with 100 GbE SMF PMD’s than IEEE would have been! What is winning in the market place is CWDM4/CLR4 and PSM4. The great cost reduction promised by serial 100G is already being met with CWDM4/CLR4 and PSM4,
to my knowledge not even a single serial 100 GbE module exist at least in our galaxy.:) To facilitate development of next generation datacenter optimized SOC supporting 50/100/200/400 GbE, my suggestion is to limit expanding 802.3bs scope to items minimally impacting the schedule and providing greatest clarity:
- Add 50 GbE and 200 GbE MAC rate
- Define 50 GbE and 200 GbE FEC/PCS
- Define single and quad lanes operation of CDAUI-8 C2C and C2M It would have been great to include in 802.3bs 50/200G backplane and Cu cabling, sorry it will be too disruptive and will delay the schedule by at least one+ year. Thanks, Ali Ghiasi Ghiasi Quantum LLC
On Dec 3, 2015, at 12:15 PM, Mike Dudek <mike.dudek@xxxxxxxxxx> wrote:
It won’t be a slam-dunk to create a CAUI-2 using KR-FEC when the CDAUI-8 is using KP-FEC. Also if we are considering 100GBASE-DR or 100GBASE-LR2
those are likely to want the KP-FEC. I expect also that the 50G serial backplane and copper links are going to want the KP4 FEC. Ie the KP-FEC will be in any chips designed for 50G PAM4. Mike Dudek QLogic Corporation Director Signal Integrity 26650 Aliso Viejo Parkway Aliso Viejo CA 92656 949 389 6269 - office. From: John
D'Ambrosia [mailto:jdambrosia@xxxxxxxxx] Jeff, If I get your point here ? the only thing you are adding to what I already pointed out was the interaction between a x2 C2C with a x4 C2M. Right? John From: Jeffery
Maki [mailto:jmaki@xxxxxxxxxxx] I support what Chris is saying. In addition, I think we will need to examine support of existing 100G PMDs with a new optional electrical interface,
the CAUI-2 (2x50G) C2M. Further, we should examine CAUI-2 C2C, where the C2M interface is CAUI-4. The desire for things to persist to work with KR4 FEC rather than requiring a new FEC code shall be high. Jeff From: Chris
Cole [mailto:chris.cole@xxxxxxxxxxx] The idea of rolling 200G into the 400G project is compelling. In prior discussions, we had rejected this as too late for 802.3bs TF, so it’s encouraging
to see we are willing to revisit. One mental test of why this makes sense is to consider what we would have done in 400G Study Group if we knew what we know now. Given the CFI support, it could be argued that most people would have supported both 200G and
400G. If anything, 200G is more compelling.
Chris From: John
D'Ambrosia [mailto:jdambrosia@xxxxxxxxx] Dear Task Force Participants, This email is to make sure that everyone is aware of conversations happening in the 50/100/200G Study Group Phone Conference that happened yesterday ? Dec 2.
There has been discussion at how the multi-lane 100G/200G solutions might be rolled into the 802.3bs project. To that end ? I gave a presentation at the conference call that looked at potential modifications / additions to our PAR / CSD. Seehttp://www.ieee802.org/3/50G/public/adhoc/archive/dambrosia_120215_50GE_NGOATH_adhoc_v2.pdf I encourage everyone to review this presentation and consider the findings on the last few pages. Individuals may wish to participate in the upcoming 50/100/200G
ad hoc calls that Mr. Nowell has planned. For more information seehttp://www.ieee802.org/3/50G/public/adhoc/index.html. I will be working on the meeting announcement for the January interim, and anticipate that there will be a joint session of our Task Force with the Study Groups
to further consider these implications. Regards, John D’Ambrosia Chair, IEEE P802.3bs 400GbE Task Force |