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Re: [802.3_NGECDC] Draft - Beyond 400 GbE CFI Consensus Deck

Hi Chris,

Of course I know that Mr. Anslow would always cringe at use of the word “gray” with respect to optics, but your characterization is somewhat different from how the term would be used thinking from a network perspective.

 

Client interfaces are normally though of as gray, and what distinguishes this is that there is only one logical signal per fiber. It may be a multi-lane O-band Ethernet client plug, and I don’t actually care how many lanes it is (e.g., 400GBASE-FR4) – I can’t really use the rest of the fiber for anything else. Logically, it is a single, indivisible, 4-wavelength signal.

 

The WDM interfaces would be thought of as network or “line-side” interfaces with multiple signals per fiber (usually C-band, maybe C+L).

Regards,

Steve

 

From: Chris Cole <chris.cole@xxxxxxxxxxx>
Sent: Wednesday, September 23, 2020 3:42 PM
To: STDS-802-3-NGECDC@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGECDC] Fwd: [802.3_NGECDC] Draft - Beyond 400 GbE CFI Consensus Deck

 

Hi Ali,

 

Yes, it is a fascinating report; dispels many deeply held beliefs. 😊

 

WDM is any optic that has two or more wavelengths per fiber, on any wavelength grid.

 

Gray is any optic that has only one wavelength per fiber.

 

Chris

 

From: Ali Ghiasi <ali@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, September 23, 2020 2:37 PM
To: Chris Cole <chris.cole@xxxxxxxxxxx>
Cc: STDS-802-3-NGECDC@xxxxxxxxxxxxxxxxx
Subject: Fwd: [802.3_NGECDC] Draft - Beyond 400 GbE CFI Consensus Deck

 

Hello Chris,

 

Interesting report!

 

What is the definition of Gray and WDM?  I assume LC must be counting CWDM4, 4WDM10, FR4, and LANWDM as WDM.

 

Thanks,
Ali Ghiasi

 

Begin forwarded message:

 

From: Chris Cole <chris.cole@xxxxxxxxxxx>

Subject: Re: [802.3_NGECDC] Draft - Beyond 400 GbE CFI Consensus Deck

Date: September 23, 2020 at 1:34:18 PM PDT

Reply-To: Chris Cole <chris.cole@xxxxxxxxxxx>

 

Our friends at Light-Counting just published their latest optics vendor survey report. As always it’s a treasure trove of wonderful data, and it’s irresistible to play with.

 

A problem in the way we look at volumes is focus on counting boxes, rather than underlying technology, for example the graph on page 57 of the below referenced CFI deck. Another example is just counting modules, whose limitations were illustrated by the recent discussion of break-out on this reflector. 

 

Our Logic colleagues have figured how to get a true picture of switches. In describing an ASIC, not only is the total bandwidth of the BGA package listed, but also the number and speed of the of SerDes and MAC cores. Since we get some of our best technical ideas from the Logic guys (ex. KR4 and KP4 FECs), why not learn from their approach here.

 

The underlying technology in optics are the wavelengths, so why not count those as well. In the below table, their volume is aggregated across all Ethernet codes for the first half of this year. There are multiple interesting observations that arise from this perspective.

 

Those that have access to the LC report will find even more interesting observations in wavelength cost data averaged across all codes.

 

Chris

 

 

 

   Vendor Survey, Q1 + Q2 2020 Ethernet Data,  9/17/20

λ Type 

10G λ

25G λ

50G λ

100G λ

Fiber

Color

Volume

Volume

Volume

Volume

SMF

Gray

           5,139,912

           1,693,126

                28,325

              596,158

WDM

           1,871,800

         11,065,264

              418,384

                16,004

All

           7,011,712

         12,758,390

              446,709

              612,162

MMF

Gray

           8,927,088

           8,713,686

              787,200

                      -  

WDM

           1,224,000

           1,040,000

                      -  

                      -  

All

         10,151,088

           9,753,686

              787,200

                      -  

 

 

From: John D'Ambrosia <jdambrosia@xxxxxxxxx> 
Sent: Sunday, September 20, 2020 5:58 PM
To: STDS-802-3-NGECDC@xxxxxxxxxxxxxxxxx
Subject:  [802.3_NGECDC] Draft - Beyond 400 GbE CFI Consensus Deck

 

All,

I have uploaded the latest version of the draft CFI Consensus Deck.  Please see  https://www.ieee802.org/3/ad_hoc/ngrates/public/calls/20_0928/dambrosia_nea_01_200928.pdf.

 

This is not the version intended for presentation at the 9/28 meeting.  I will update the latest version as further modifications are made.  Please note I have also updated the supporters list.  If you emailed me your support, please check the list and confirm I have added you correctly.

 

Regards,

 

John D’Ambrosia

Champion, Beyond 400 GbE CFI Consensus

Chair, IEEE 802.3 NEA Ad hoc

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