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Re: [802.3_EPOC] MMP implementation issues: Multiple FCUs and MMP, is it different?

Ed,

Thanks much for putting this out there, as it helps illustrate where we may be making different assumptions.

For me, I was not assuming that the sum of A+B+C is less than or equal to 10 Gbps; on the contrary, I've been assuming that the total available bandwidth for the sum of the FCUs would likely be greater than 10 Gbps.

If you change that assumption, does that change your conclusion about the difference between multiple FCUs and MMP?

Thanks!

Matt

From: "Ed Boyd (Edward)" <ed.boyd@xxxxxxxxxxxx<mailto:ed.boyd@xxxxxxxxxxxx>>
Reply-To: "Ed (Edward) Boyd" <ed.boyd@xxxxxxxxxxxx<mailto:ed.boyd@xxxxxxxxxxxx>>
Date: Monday, January 7, 2013 5:32 PM
To: "STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx<mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>>
Subject: [802.3_EPOC] MMP implementation issues: Multiple FCUs and MMP, is it different?

Jorge, Duane, and all,

I started a new thread since I wasn’t quite sure where to insert my reply.  Let me start with the drawing with multiple FCUs question that you proposed.

[Description: cid:image001.jpg@01CDECF9.0BFEEB40]

The assumption with multiple FCUs is that you are shaping 3 pipes (A, B, & C) inside the 10G EPON downstream.  If you make that sum of those 3 less than the maximum rate, you can send them down the PON at the same with a single packet of jitter.  The total bandwidth of the downstream is a constant since it is the sum of the 3 constants.

For Multiple sub-pipes: Total BW = A + B + C  (Sum of 3 Constants)

In the case of MMP, you have a single pipe with a changing data rate based on the destination.  The data rate from the OLT is not a constant or the sum of 3 pipes.  It is going up and down based on the destination.  A single shaping bucket is used but the debit for the reverse leaky bucket is different based on destination.  The total bandwidth equation is an OR.

For MMP: Total BW = A | B | C.  (The total bandwidth or maximum bandwidth is based on the traffic)


I hope that helps.  I will send a separate email on the other issues related to the MAC layer solution.

Thanks,
Ed…

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Edward Boyd | Sr Technical Director
Broadcom Corporation | (O) 707-792-9008 | (M) 707-478-1146

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