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fibre_channel - RE: [EXTERNAL]--[fibre_channel] RE: FC-PI-8 interim ZOOM call Message Thread: Previous | Next
  • To: "Xu, Yang (Sunny)" <Sunny.Xu@xxxxxxxxxxxxx>, "Swanson, Steven E" <SwansonSE@xxxxxxxxxxx>, "workgroup_mailer@xxxxxxxxxxxxxxxxxxxx" <workgroup_mailer@xxxxxxxxxxxxxxxxxxxx>, "fibre_channel@xxxxxxxxxxxxxxxxxxxx" <fibre_channel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jose Castro <Jose.Castro@xxxxxxxxxxx>
  • Date: Tue, 11 Jan 2022 17:19:55 +0000
  • Cc: "Dean Wallace (deanw@xxxxxxxxxxx)" <deanw@xxxxxxxxxxx>, "Kozischek, Dave R." <KOZISCHEDR@xxxxxxxxxxx>

Hi Sunny,


You requested to add an explanatory note to Table 12 (Max. Value of discrete reflectance).

This would have been straightforward for DR specifies the max. MPI penalty per channel loss as shown in Table 140-12 of 802.3 cu.

However, this does not seem to be the case for 100GBASE FR or LR channels which are more related to the Fibre Channel SMF variant.

It is possible that some join allocation for  DGD and MPI penalties was used. However, I cannot find an explanation in the IEEE document. I will need to review the presentations and ask some IEEE participants who provided the simulations. I should have more information before our meeting in February.


Hi Steve,

Thank you for providing the links for the ORL. I will try to contact some of the presenters.

Please let us know if you have more information about the MPI penalty values associated with the reflectance shown in  table 12 (Table 140-14).






From: fibre_channel@xxxxxxxxxxxxxxxxxxxx [mailto:fibre_channel@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Xu, Yang (Sunny)
Sent: Friday, January 7, 2022 2:03 PM
To: Swanson, Steven E <SwansonSE@xxxxxxxxxxx>; workgroup_mailer@xxxxxxxxxxxxxxxxxxxx; fibre_channel@xxxxxxxxxxxxxxxxxxxx
Cc: Dean Wallace (deanw@xxxxxxxxxxx) <deanw@xxxxxxxxxxx>; Kozischek, Dave R. <KOZISCHEDR@xxxxxxxxxxx>
Subject: [fibre_channel] RE: [EXTERNAL]--[fibre_channel] RE: FC-PI-8 interim ZOOM call


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Hi Steve,

Happy new year! Thanks for your comments and material, it provided good background for our conversations today.


Hi all,

I have noted down the below changes for Table 9 – text in red were agreed on (with some minor editorial suggestions), and highlighted in yellow will be further discussed at the Feb meeting.


      Table 9 – Fiber Optic Cabling (Channel) Characteristics





Normal Nominal Fiber Sepcification Specification Wavelength




Cable Optical Fiber Attenuation (max)


0.43 or 0.50


Zero Dispersion Wavelength




Dispersion Slope (max) (S0)

ps/nm2km ps/(nm2 x km)




1 The Outside Plant cable (OS2) attenuation is 0.4dB/km at 1310nm as defined in ANSI/TIA-568.3 and ISO/IEC 11801-1. The 0.43dbdB/km at 1304.5nm attenuation for optical fiber cables is derived from Appendix I of ITU-T G.695.

2 The 0.5dB/km attenuation is provided for Outside Plant Indoor-Outdoor cable as defined in ANSI/TIA

568.3 -C.3.


Thanks all for a great discussion today.



Sunny Xu


From: Swanson, Steven E <SwansonSE@xxxxxxxxxxx>
Sent: Tuesday, January 4, 2022 3:23 PM
To: Xu, Yang (Sunny) <Sunny.Xu@xxxxxxxxxxxxx>; workgroup_mailer@xxxxxxxxxxxxxxxxxxxx; fibre_channel@xxxxxxxxxxxxxxxxxxxx
Cc: Dean Wallace (deanw@xxxxxxxxxxx) <deanw@xxxxxxxxxxx>; Kozischek, Dave R. <KOZISCHEDR@xxxxxxxxxxx>
Subject: RE: [EXTERNAL]--[fibre_channel] RE: FC-PI-8 interim ZOOM call



Hi Sunny,


Happy New Year.


Dave Kozischek and I discussed these topics this morning and I have sent him some backup information for discussion on your call.


My recommendations:


  1. In Table 9, keep footnotes 1 and 2 because they are consistent with all of the application specifications in IEEE. These specifications are based on CWDM systems.


Add a footnote 3: “Using 0.5 dB/km may not support operation at 10 km for Fibre Channel applications.”


I am not sure what you mean by “clarify the 1304nm.” There is a footnote in the 100G-LR link budget tables that notes “aThe channel insertion loss is calculated using the maximum distance specified in Table 2-1 and cabled optical fiber attenuation of 0.43 dB/km at 1304.5 nm plus an allocation for connection and splice loss given in 5.2.1.”


  1. Regarding optical return loss, again these values are consistent with the DR application specifications in IEEE


The basis for the original work were presented in 802.3cd for 500m 100G-DR




The basis for 2km and 10km 100G-DR were presented in 802.3cu




Best regards,




Steven E. Swanson

Senior Standards Manager

Distinguished Associate

Global Technology & Industry Standards


Corning Optical Communications

4200 Corning Place

Charlotte, NC 28216


m 607-725-1129




Standards are a bridge between markets and technologies; whoever controls the bridge controls the future…


From: fibre_channel@xxxxxxxxxxxxxxxxxxxx <fibre_channel@xxxxxxxxxxxxxxxxxxxx> On Behalf Of Xu, Yang (Sunny)
Sent: Tuesday, January 4, 2022 1:46 PM
To: workgroup_mailer@xxxxxxxxxxxxxxxxxxxx; fibre_channel@xxxxxxxxxxxxxxxxxxxx
Cc: Dean Wallace (deanw@xxxxxxxxxxx) <deanw@xxxxxxxxxxx>
Subject: [EXTERNAL]--[fibre_channel] RE: FC-PI-8 interim ZOOM call


Hi all,


In preparation of the interim call, please find below content for further discussion.



  • Note 1 – It appears to be related to the center wavelength specified in Table 6. Recommend having one spec of 0.4dB/km (also aligns with all other international standards), and clarify the 1304.nm spec in footnote.
  • Note 2 – This is outdated and needs to be corrected. ANSI/TIA-568.3 OS2 attenuation spec has changed to 0.4dB/km, which is in alignment with ISO/IEC 11801-1.



How are these values calculated? How often are these used in practice given standard-compliant connectors must meet the IEC spec of 55dB.




Sunny Xu


-----Original Appointment-----
From: workgroup_mailer@xxxxxxxxxxxxxxxxxxxx <workgroup_mailer@xxxxxxxxxxxxxxxxxxxx>
Sent: Monday, December 20, 2021 10:25 AM
To: workgroup_mailer@xxxxxxxxxxxxxxxxxxxx; fibre_channel@xxxxxxxxxxxxxxxxxxxx
Subject: FC-PI-8 interim ZOOM call
When: Friday, January 7, 2022 10:00 AM-11:30 AM America/Los_Angeles.
Where: ZOOM meeting


Event Title: FC-PI-8 interim ZOOM call

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