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fibre_channel - RE: [EXTERNAL]--[fibre_channel] RE: FC-PI-8 interim ZOOM call
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- 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>
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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).
Regards,
Jose
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
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Description
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Unit
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Value
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Note
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Normal Nominal
Fiber Sepcification Specification
Wavelength
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nm
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1310
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Cable Optical Fiber Attenuation (max)
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dB/km
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0.43 or 0.50
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1,2
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Zero Dispersion Wavelength
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nm
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1300<=v0<=1324
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Dispersion Slope (max) (S0)
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ps/nm2km
ps/(nm2 x km)
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0.093
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Notes:
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.
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Thanks all for a great discussion today.
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:
- 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.”
- 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
·
https://www.ieee802.org/3/cd/public/Nov16/traverso_3cd_01_1116.pdf
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https://www.ieee802.org/3/cd/public/Mar17/traverso_3cd_01_0317.pdf
The basis for 2km and 10km 100G-DR were presented in 802.3cu
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https://www.ieee802.org/3/cu/public/May19/welch_3cu_02b_0519.pdf
·
https://www.ieee802.org/3/cu/public/cu_adhoc/cu_archive/welch_3cu_adhoc_061919.pdf
Best regards,
Steve
Steven E. Swanson
Senior Standards Manager
Distinguished Associate
Global Technology & Industry Standards
MT&E
Corning Optical Communications
4200 Corning Place
Charlotte, NC 28216
m 607-725-1129
swansonse@xxxxxxxxxxx
Standards are a bridge between markets and technologies; whoever controls the bridge controls the future…
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.
Cheers,
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
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Event Title:
FC-PI-8
interim ZOOM call
Date: Friday, 07 January 2022, 10:00am to 11:30am PST
Location: ZOOM meeting
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