Re: [8023-10GEPON] [FEC superating] - Draft two of the presentation.
Dear Frank,
I would like to add input to rate analysis ad hoc.
There is an opinion that we should also consider combination of
Super-rating and Sub-rating as a possibility. Generally it is difficult
to achieve the power budget requirement of upstream than downstream. So
we can select Sub-rating for upstream and Super-rating for downstream.
This is not strong opinion, but we have to consider one alternative.
Best Regards,
Fumio Daido
Sumitomo Electric Industries, LTD.
On 2007/02/27 0:32, Frank Effenberger wrote:
> Dear Fumio,
>
> Thank you for your input. I think this might spark some useful discussions,
> if people feel strongly one way or another.
>
> Sincerely,
> Frank E.
>
> -----Original Message-----
> From: Fumio Daido [mailto:daido-fumio@sei.co.jp]
> Sent: Monday, February 26, 2007 7:43 AM
> To: STDS-802-3-10GEPON@listserv.ieee.org
> Cc: Frank Effenberger
> Subject: Re: [8023-10GEPON] [FEC superating] - Draft two of the
> presentation.
>
> Dear Frank and all,
>
> I am Fumio Daido of Sumitomo Electric and am person in charge of
> collecting opinion of Japanese vendor regarding rate increase analysis.
>
> Basically most of people agree to your draft (FECsuperatingV2.ppt).
>
> I would like to inform you of opinion of Japanese system vendors for
> your draft.
>
> <assumption>
> Supper rated speed are 11.049Gbps for RS(255,239) and 11.417Gbps for
> RS(255,231).
>
> < cost comparison between Super-rating and Sub-rating(10.3125Gbps) >
> There are two different opinion regarding cost increase. One opinion is
> that the rate increase affects the cost. The other opinion is that the
> rate increase does not affect the cost. So I will show you two opinion
> below.
>
> - opinion A
> It is difficult to estimate cost increase of Super-rating, because the
> cost increase depends on the minimum sensitivity of receiver
> specification. If the margin between the minimum sensitivity of the
> specification and the average sensitivity of actual transceiver is
> small, that results in increasing cost due to yield loss. Especially,
> the margin would be small in case of ClassB++.
>
> - opinion B
> The cost increase of Super-rating up to 11.417Gpbs will be nothing in
> three years. If the Super-rating is 12.5Gbps, the increased cost ratio
> is from 1.3 to 1.4 compared with 10.3125Gbps.
>
>
> What information is required more for rate increase analysis?
>
> Best Regards,
>
> ----
> Fumio Daido
> Sumitomo Electric Industries, LTD.
>
> On 2007/02/14 1:57, Frank Effenberger wrote:
>> Everybody,
>>
>>
>>
>> I have prepared a new draft. This incorporates several comments
>> received, and develops a conclusion piece that drives a result.
>>
>>
>>
>> Just to review the idea of this effort: This presentation was designed
>> to lay out all the arguments, pro and con, for super- and sub-rating.
>>
>> This way, an audience can be quickly brought up to speed, to facilitate
>> their knowledgeable advice and consent.
>>
>> I can say that this decision is basically a "judgment call," with good
>> reasons for both sides, and really will only be solved democratically.
>
>> As you will see in the final slide, the smaller 802.3av group has
>> already indicated via straw poll that the sub-rating is preferred,
>> unanimously, in fact.
>>
>> So, I think the next step is to take this presentation to the wider
>> 802.3 group, perhaps in the opening plenary of the next meeting.
>>
>> Then, we can take their temperature with a straw poll, and see where we
>> stand.
>>
>> If they indicate general agreement, then the deal is done.
>>
>> If there is trouble, then we will burn that bridge when we come to it.
>>
>>
>>
>> Please comment.
>>
>>
>>
>> Dr. Frank J. Effenberger
>>
>> Huawei Technologies USA
>>
>> 1700 Alma Drive, Plano TX 75075
>>
>> Office (732) 625 3002
>>
>> Cell (908) 670 3889
>>
>>
>>
>> p.s. Personal disclaimer: I perceive that folks might wonder about my
>> personal position on this matter (that is, if you care!) Originally, I
>> was for super-rating, because of the stylistic 'cleanliness is closer to
>> Godliness' argument. But, in discussing this with various industrial
>> sources, I get the feeling that the optics people are turned off by
>> super-rating, and so the market cost argument will end up favoring the
>> sub-rating, and cost is everything in access. So, I changed my mind,
>> and now favor sub-rating.
>>
>>
>>
>>
>>
>