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[8023-10GEPON] Frame Delay Variability - simulation results and proposal (updated)

All,

I made a few updates to the 3av_0811_kramer_2.pdf as shown below:

1) On page 4, FEC_Overhead function was erroneously showing "ceiling" brackets instead of the "floor" brackets.
2) On slide 16, the delay variability 0.4 TQ is replaced with 0.2 TQ. (The variability is 4 byte times, which is 0.2 TQ).
3) On slide 15, the definition of alignmentCorrect variable was modified to account for the fact that at the ONU the byteTime counter is reset at the beginning of every burst.

Change #3 is an essential change. Therefore, rather than simply offering an update to a previously posted presentation, these slides will be submitted as a new (post-deadline) presentation (also attached here).

The simulation code used to verify the state machines is uploaded to http://www.ieee802.org/3/av/working_docs/3av_0811_phy_dly_sim.zip


Please, review the readme.txt first. I'll be glad to answer your questions.

Thank you,
Glen


> -----Original Message-----
> From: Glen Kramer [mailto:glen.kramer@xxxxxxxxxxxx]
> Sent: Tuesday, October 21, 2008 9:55 PM
> To: STDS-802-3-10GEPON@xxxxxxxxxxxxxxxxx
> Subject: [8023-10GEPON] Frame Delay Variability - simulation results and
> proposal
>
> Dear Colleagues,
>
> In September meeting, I got an action item to simulate the latest state
> machines and verify the frame delay variability.
>
> Attached presentation summarizes our findings. It shows three corner cases
> where due to various conditions delay of a frame, including MPCPDUs, may
> increase to 32 byte times (1.6 TQ).
>
> The details for these conditions are somewhat complicated. I am posting
> this presentation on the reflector, so that we have a chance to discuss it
> before the November meeting. I also have submitted a few comments related
> to these findings.
>
> Please, let me know if anything requires clarification or if you find any
> inaccuracies or mistakes.
>
> Thank you,
> Glen

Attachment: 3av_0811_kramer_3.pdf
Description: 3av_0811_kramer_3.pdf