Re: [802.3_EPOC] Study Group Questions
Agreed. I think we've wandered a bit, although it's been a good
discussion. :-)
On 1/3/12 3:56 PM, "Marek Hajduczenia" <marek.hajduczenia@xxxxxx> wrote:
>Hi Matt,
>
>It is a long-standing rules in 802.3 that projects develop a single
>solution
>for a single problem. Unless it can be demonstrated that there are two
>separate problems, each one needing a unique PHY solution, I'd think we
>are
>bound to converge here onto one solution only.
>
>Note also that at the SG phase, we do not develop solutions. That is the
>job
>of the Task Force in the near future. SG discusses objectives for the
>future
>Task Force, and we should be concerned only about them at this time.
>
>Marek
>
>-----Original Message-----
>From: Matthew Schmitt [mailto:m.schmitt@xxxxxxxxxxxxx]
>Sent: 03 January 2012 22:46
>To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
>Subject: Re: [802.3_EPOC] Study Group Questions
>
>Alex,
>
>In response to your comment below to me...
>
>I'm not sure I agree that a TDD system inherently provides more spectral
>flexibility than an FDD system in a passive coax environment. Depending
>on
>the PHY layer, you can do quite a bit of steering regardless of FDD vs.
>TDD. I will agree that a TDD solution can provide advantages in terms of
>the relative allocation of bandwidth to upstream vs. downstream operation,
>although only with a MAC designed to support such features.
>
>That said, I'm more than open to being proven wrong, and so I will
>definitely look forward to your presentation to highlight why you believe
>TDD had advantages over FDD.
>
>BTW, I also tend to agree with others on this thread that it's MUCH
>preferred if we can develop a single solution. Without that, you end up
>with a fragmented market, and it's much harder to achieve the same
>economies
>of scale that you could have with a single, unified solution.
>If it's simply not possible to come up with a single unified solution, so
>be
>it; but I think that should be our goal if at all possible.
>
>Thanks.
>
>Matt
>
>
>
>On 12/15/11 7:48 PM, "Liu, Alex" <alexliu@xxxxxxxxxxxxxxxx> wrote:
>
>>Ed,
>>
>>Let me reiterate some of the finer points of my previous missive: (1)
>>TDD systems have a wide footprint in China in part due to their
>>spectral convenience, (2) TDD should be an optional profile in addition
>>to and not in place of FDD. I do believe that market enthusiasm for,
>>and acceptance of, this standard and its ensuing products should be our
>>guiding principle, and not doctrinal orthodoxy within a standards
>>framework. If things weren't so, Ethernet would have never abandoned
>>CSMA/CD for first-mile applications.
>>
>>More specifically, it is clear that an FDD RF system that directly maps
>>to the dedicated wavelengths in fiber and thus the EPON protocol is
>>most appropriate for the N. American MSO environment. I would like to
>>raise the possibility that this is not necessarily true for China.
>>Passive cable plant coupled with haphazard spectrum planning makes for
>>an inviting TDD target. There are then the orthodoxies emanating from
>>the Chinese side. If we are serious about targeting the China market, I
>>suggest we consider SARFT's input.
>>
>>@Matt: TDD's ability to operate in unpaired spectrum makes "lively"
>>spectrum plans possible in China. Perhaps this is improperly termed
>>"coexistence with" and is better called "steering around" existing TV
>>and data systems. This additional degree of freedom may perhaps be
>>attractive to N. American operators as well.
>>
>>@Mark: we *are* working toward a single standard. Transparent EPON
>>protocol operation over coax is the goal and FDD RF operation should be
>>the mandatory supported mode. Employing the modern PHY proposals being
>>developed in an optional TDD mode should not detract from this stated
>>goal. LTE offers an instructive precedent.
>>
>>Alex
>>
>
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