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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:
From: Marek Hajduczenia [mailto:mxhajduczenia@xxxxxxxxx]
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
On Thu, Jan 4, 2018 at 2:08 PM, John Johnson <john.johnson@xxxxxxxxxxxx> wrote: