I missed this exciting phone call as I was in China.
If you ask me, once we start messing around with the agreed upstream, then all semblance of a reasonable design goes away. Symmetry is lost.
In that case, I would favor just the original plan A, just two channels this time. Some reasonable channel width (3nm) and spacing (maybe 1600GHz) We could reuse the existing LR4 optics, 1295 and 1305, for the ONUs. If we want to make this a near term standard, that's the way to do it.
Frank E
Sent from HUAWEI AnyOffice
I agree that separate DBA domains for 10G and 25G upstream is desirable. In pure 50G greenfield we already have a mechanism—just use US0-A and US0-B (harstead_3ca_1_0917). Marek’s proposal is to extend this capability to the 10G PON brownfield co-existence scenario.
The disadvantages that I see:
- A small DS/US gap for these 25/10 US0-A ONUs—only 25 nm. I don’t know the penalty, as funada_3ca_1_0117 does not address penalties for gaps this small. It could be sizable. Is there a risk that 25 nm gap is not implementable in the traditional 45 degree BOSA?
- Lose the advantage John has cited with his favored plan, that of not requiring a new wavelength for 10G DMLs (1310 nm DMLs exist).
Ed
From: Marek Hajduczenia [mailto:mxhajduczenia@xxxxxxxxx]
Sent: Thursday, January 04, 2018 4:13 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_NGEPON] Upstream Wavelength Plan
That might James' opinion. I do not share it. We have enough spectrum to optionally allow WDM coexistence between 25G and 10G systems.
At the end of the day, I personally do not care about new 10G upstream, but only about making both 25G channels equally challenging and limit their dispersion penalty. I do know though that the optional ability to do 10G and 1G upstream separation in today's system is a saving grace in many deployments where these systems are overlapped on the same fiber strand. I do not see any advance of doing the overlap if we can have some separation between these systems
M
On Thu, Jan 4, 2018 at 2:08 PM, John Johnson <john.johnson@xxxxxxxxxxxx> wrote:
Marek,
zhang_dezhi_3ca_2a_1117 proposed the principal that different rates in the same PON generation should share spectrum by TDM. I think that this principal should apply to 25G and 10G (using 25G protocol) upstream.
Ed, please add me to your list.
Regards,
John
On Thu, Jan 4, 2018 at 3:08 PM, Marek Hajduczenia <mxhajduczenia@xxxxxxxxx> wrote:
Ed et al.,
Here are two versions of what I was suggesting, depending on how we want to stack red 25/10G options
Please include me in the discussion chain.
Thanks
M
From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Sent: Thursday, January 4, 2018 12:48 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] Upstream Wavelength Plan
All,
Per the discussion on today’s call: For anyone interested in joining the small group working to achieve consensus on the upstream wavelength plan, please send me an email.
Ed
From: Curtis Knittle [mailto:C.Knittle@xxxxxxxxxxxxx]
Sent: Wednesday, January 03, 2018 4:09 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] 1/4/18 IEEE 802.3ca (100G-EPON) consensus building meeting agenda
Dear Colleagues,
We have two contributions for consensus-building meeting on January 4, 2018:
- Upstream Wavelength Plan - Ed Harstead
- Upstream Burst Structure – Marek Hajduczenia
Meeting time is 11:30 – 1:00 Mountain Standard Time. Zoom details are below.
Curtis
Join from PC, Mac, Linux, iOS or Android: https://cablelabs.zoom.us/j/804971785
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Curtis Knittle
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