Re: [802.3_NGEPON] Objectives
All,
I thought the table was a great idea, but I am now not so sure. What happens if you start with 25 down/10 up, and later you add a 25 down/25 up? Sounds like a reasonable scenario. The MAC then must support 50 down/35 up. That would be disallowed by the table. You would have to replace all the 25/10 ONUs before you could add any more upstream capacity.
As an example, NG-PON2 simply said that any downstream lane is either 2.5G or 10G, and every upstream lane is either 2.5G or 10G (it only disallowed 2.5 down/10 up wavelength pairs). They did not build a table of all the permutations, they never worried that the PON could have a "weird" total capacity of, say, 12.5 down/5 up. (I realize a difference is that we are grouping all wavelengths under a single MAC, but I'm just trying to make a point with this example.)
So I wonder if we should go back to text. What about:
Provide specifications for a downstream physical layer that operates over one, two, three, or four lanes of 25 Gb/s each, supported by a single MAC.
Provide specifications for an upstream physical layer that operates over one, two, three, or four lanes, each of which may be either 10 or 25 Gb/s, supported by a single MAC.
Ed
________________________________________
From: Curtis Knittle [C.Knittle@xxxxxxxxxxxxx]
Sent: Monday, September 14, 2015 10:59 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] Objectives
Colleagues,
Please find attached the PowerPoint file we used this evening to consider/massage new objectives. We’ll pick up with this file in the morning, 8 am EDT.
Curtis
Curtis Knittle
Director, Optical Technologies
CableLabs
858 Coal Creek Circle
Louisville, CO 80027
Office: 303-661-3851
Mobile: 303-589-6869
Email: c.knittle@xxxxxxxxxxxxx<mailto:c.knittle@xxxxxxxxxxxxx>