[STDS-802-3-400G] one comment about 4x100G breakout RE: IEEE P802.3bs 400 Gb/s Ethernet Task Force Logic Ad Hoc
Hi, Martin
400GE FEC Breakout: (langhammer_02_0615_logic.pdf) pag5 said:
1x400G KP4 ASIC: 55645
1x400G KP4 & 4x100G KR4 ASIC: 61518
11% area increase
My comments:
1) What is the size of 1x400G KP4 & 4x100G KP4 FEC?
2) today 100GbE choose KR4，but I think that the breakout 100GbE will need KP4 FEC if the 100GbE SMF PMD choose 100G PAM4 in future.
--In long term, serial is better than parallel. For 100GbE, 100G PAM4 SMF PMD is better than 4x25G SMF PMD.
3) same idea can be seen at page29 of http://www.ieee802.org/3/bs/public/14_05/maki_3bs_01a_0514.pdf QSFP28 has a DSP&FEC which convert 4x25G to 1x100G.
My conclusions:
1) 4x100G breakout, the FEC should be able to dynamic changed: 4x100G KR4, or 4x100G KP4.
2) 4x100G breakout is very important in data center switch at the positions of Spine switch and Core switch, because face port density and flexibility.
3) 8x50G and 16x25G breakout is not important, because only TOR switch need 50G/25GE, but TOR switch do not have 400GE port.
--Du Wenhua
> -----Original Message-----
> From: Mark Gustlin [mailto:mark.gustlin@xxxxxxxxxx]
> Sent: Saturday, June 20, 2015 8:09 AM
> To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
> Subject: Re: [STDS-802-3-400G] IEEE P802.3bs 400 Gb/s Ethernet Task Force
> Logic Ad Hoc
>
> All,
>
> Presentations are now up on the logic ad hoc web site from today's ad hoc call:
> http://www.ieee802.org/3/bs/public/adhoc/logic/index.shtml
>
> Thanks, Mark
>
> > -----Original Message-----
> > From: Mark Gustlin
> > Sent: Monday, June 15, 2015 10:59 AM
> > To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
> > Subject: RE: IEEE P802.3bs 400 Gb/s Ethernet Task Force Logic Ad Hoc
> >
> > All,
> >
> > Just a reminder of the upcoming logic ad hoc call.
> > The current agenda is:
> > 400GE FEC Implementation - Martin Langhammer Considerations for
> > breakout - Martin Langhammer 1x400G vs 4x100G FEC Implications - Bill
> > Wilkie
> >
> > Requests are due by end of day Wednesday. There is room for only one
> > more presentation for this call, so the next request will get the last slot.
> > There is another opportunity on June 29th.
> >
> > Thanks, Mark Gustlin
> >
> >
> > From: Mark Gustlin [mailto:mark.gustlin@xxxxxxxxxx]
> > Sent: Thursday, June 04, 2015 2:49 PM
> > To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
> > Subject: [STDS-802-3-400G] IEEE P802.3bs 400 Gb/s Ethernet Task Force
> > Logic Ad Hoc
> >
> > All,
> >
> > This is an announcement of the next IEEE P802.3bs 400 Gb/s Ethernet
> > Task Force Logic Ad Hoc conference call opportunity.
> >
> > The next call will take place on Friday June 19th from 8am-10am PDT.
> >
> > If you are interested in presenting, please request a timeslot by the
> > end of Wednesday June 17th. A separate calendar invite will also follow.
> >
> > In addition there will be another opportunity on Monday June 29th at
> > 8am- 10am PDT.
> >
> > Thanks, Mark Gustlin
> >
> >
> > -- Do not delete or change any of the following text. --
> >
> > Join WebEx meeting
> > Meeting number: 492 414 237
> > Meeting password: four123!
> > Join by phone
> > Call-in toll-free number: 1-(877) 582-3182 (US) Call-in number:
> > 1-(770) 657-
> > 9791 (US) Show global numbers Conference Code: 568 245 6486