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I agree with you that this is solving a real problem, half way.
But, if we care about not having to share bandwidth between systems, then why not have two downstreams, as well?
Then you end up with a system with 50G down and 35G up, which is very nice. Besides, that “extra OLT type” is actually not extra – it could be the 50G dual channel version.
Frank E. From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Frank, In internal reviews I got the same reaction to the 25G/35G downstream/upstream capacity. It does seem weird. But who cares if it solves a real problem? Ed From: frank effenberger [mailto:frank.effenberger@xxxxxxxxxx]
Use two different downstream wavelengths for the two upstream wavelengths, and you got my vote.
I think it is quite clearly indicated in your 25+10 upstream greenfield system.
If we don’t use two separate wavelengths, then you have a system with 25G downstream but 35G upstream capacity.
And that doesn’t fit the traffic profile anywhere.
Frank E. From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Marek, I hope this will clarify: We passed a motion in last meeting that allows 10G and 25G upstream wavelengths to use either 1270 or 1310 nm (but does not allow the 1270 nm option in the case of 10G EPON ONUs on the same ODN). Therefore we already
have two options for .3ac 10G upstream wavelengths, and our new proposal does not add any additional wavelength options. Our new proposal does not add any additional ONU variants either. The only addition is a new OLT variant.
The benefit of the new greenfield-optimized OLT variant is that 10G upstream from 25/10 ONUs and 25G from 25G/25G ONUs do not have to share the same TDM channel. We have certainly heard that operators dislike 10G + 25G
sharing. Hope that helps, Ed From: Marek Hajduczenia [mailto:mxhajduczenia@xxxxxxxxx]
Ed, I find discussion on slide 3 confusing, in that 10G US wavelength for 802.3ca devices, per your earlier slides, is around 1310nm, which makes sense, given previous discussions. On slide 3, you seem to imply that we really
have two 10G US wavelengths that can be picked and chosen, as needed, depending on whether an operator plans to use 10/10G-EPON at all or not. Seems to me we are adding way too much rope for ourselves down the road, as far as number of different optical modules
is concerned I am OK with your Bfx and Bfg wavelength plans, but I do not see any need for Gf plan and added confusion to the table.
Marek From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Here is the contribution on 802.3ca 10G US channels in greenfield. Ed From: Curtis Knittle [mailto:C.Knittle@xxxxxxxxxxxxx]
Dear Colleagues, We have at least one contribution for the 100G-EPON (IEEE 802.3ca) consensus building meeting scheduled for this Thursday, August 17, 11:30 am – 1:00 pm MDT.
Please let me know by 5:00 pm MDT Wednesday if you have any other topics for the agenda.
As a reminder from the closing report of our last F2F meeting in Berlin, the following topics were deemed important for contributions:
q
Actions:
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Par/Objectives/Scope change
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Power budget
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Close on 25Gbps power budget (Ed/Dekun/Umeda)
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MPCP/MPRS
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Preliminary proposals for changes to channel bonding scheme (Duane, Glen)(Aug 31)
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Discovery process / configuration / ONU capabilities field in RegREQ (Duane/Dan)
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Fault Tolerance/Recovery/Loss of Channel
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Wavelength plan
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2 versus 1 DS0 (Frank/EdH)(August 17)
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SOA preamp/dynamic range
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Cost and feasibility still needs to be demonstrated
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Line coding (Postponed until after FEC decision)
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FEC information
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Comparisons of parity matrices and different FEC (Mark/Bill/Yin)
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SERDES/CDR
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Check margin for 10^-2 input BER (Yin, Ryan)
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50G single wavelength
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Technical feasibility of upstream bursts (Critical path item) (Nokia) (likely September)
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Wavelength plan
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Power budget
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Modulation Thank you, Curtis Curtis Knittle VP Wired Technologies – R&D CableLabs desk: +1-303-661-3851 mobile: +1-303-589-6869 Stay up to date with CableLabs: Read the blog and
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