Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

RE: Equalization and benefits of Parallel Optics.


As part of the distance Ad Hoc, I was under the impression that the 300m 
objective was for new technology MMF in the building risers.  The Ad Hoc 
was told that 100m over "installed" MMF was feasable at a symbol rate of 
over 10Gb, equivalent to the proposed 850nm serial PMD.  Were we 
mislead?  I don't know.  As a customer participating in this process and 
going back to looking at the most likely areas of initial implementation 
and the implementation practices, I am the more serious about holding the 
people that said that they could do the serial 850nm PMD to their implied 

Thank you,
Roy Bynum

At 01:33 PM 7/27/00 -0700, Paul Bottorff wrote:

>I also understand our objectives in the same way. We don't have an 
>objective for 100 m computer room connections. It seems to me the 300 m 
>objective was written for computer rooms. The 300 m over MMF could be 
>applied to any fiber solution.
>At 12:55 PM 7/27/2000 -0700, Booth, Bradley wrote:
>> From my understanding of the objectives, the task force doesn't have a
>>distance objective of "100m data center applications."  We do have an
>>objective for 100m over installed MMF fiber.  That 100m distance objective
>>was chosen because it reflects what is used in the data center applications.
>>If the task force satisfies the objective (which is a requirement for the
>>task force to do), then we provide a solution for the application.  The
>>reverse is not true.  If task force satisfies the application, then we don't
>>meet our objectives.
>>Given that the task force has to satisfy objectives first and foremost, I
>>believe that it is key that the task force focus on those proposals that in
>>some manner satisfy an objective.  As I see it, parallel optics and parallel
>>fiber do not satisfy any of our objectives; therefore, the task force needs
>>to work on the ones that will satisfy our objectives.
>>                 -----Original Message-----
>>                 From:   ghiasi [mailto:Ali.Ghiasi@xxxxxxxxxxx]
>>                 Sent:   Thursday, July 27, 2000 2:17 PM
>>                 To:     stds-802-3-hssg@xxxxxxxx; bradley.booth@xxxxxxxxx
>>                 Cc:     Ali.Ghiasi@xxxxxxxxxxx
>>                 Subject:        RE: Equalization and benefits of Parallel
>>                 Brad
>>                 > From: "Booth, Bradley" <bradley.booth@xxxxxxxxx>
>>                 > To: stds-802-3-hssg@xxxxxxxx
>>                 > Subject: RE: Equalization and benefits of Parallel Optics.
>>                 > Date: Wed, 26 Jul 2000 18:29:56 -0700
>>                 > MIME-Version: 1.0
>>                 > X-Resent-To: Multiple Recipients
>>                 > X-Listname: stds-802-3-hssg
>>                 > X-Info: [Un]Subscribe requests to
>>                 > X-Moderator-Address:
>>                 >
>>                 >
>>                 > I have one question:
>>                 >
>>                 > Which of our distance objectives is satisfied with
>>parallel fiber and
>>                 > parallel optics?
>>                 The 100 m data center applications.
>>                 >
>>                 > It has been my interpretation that when we talked about
>>100m of installed
>>                 > base of MMF, that we were referring to the MMF fiber
>>currently available for
>>                 > use by 802.3z.  Parallel optics does not operate over this
>>installed base.
>>                 You are correct parallel optics would not operate over an
>>installed two fiber
>>                 plant.  Parallel optics would loose if you go in to an
>>installed fiber base.
>>                 What I suggested was 100m data center applications, where
>>the fiber are not
>>                 installed in the building wiring.
>>                 Data center application are very significant as stated in
>>the last meeting
>>                 about half the total market.  Solutions significantly lower
>>cost targeted
>>                 for sub 100 m is needed, otherwise there will several
>>proprietary solutions.
>>                 Parallel optics is the lowest cost, almost mature after 3
>>years, lowest power,
>>                 and smallest foot print.  Parallel optics is ideal to get
>>bandwidth off the
>>                 edge of your board.
>>                 Serial 850 or CWDM 850 can be another candidate for low cost
>>data center
>>                 applications by having cable advantage over parallell fiber.
>>But you need
>>                 to offset fiber advantage against power, size, cost,
>>testing, and maturity.
>>                 >
>>                 > Or am I missing the point here?
>>                 >
>>                 > Cheers,
>>                 > Brad
>>                 Thanks,
>>                 Ali Ghiasi
>>                 Sun Microsystems
>>                 >
>Paul A. Bottorff, Director Switching Architecture
>Enterprise Solutions Technology Center
>Nortel Networks, Inc.
>4401 Great America Parkway
>Santa Clara, CA 95052-8185
>Tel: 408 495 3365 Fax: 408 495 1299 ESN: 265 3365
>email: pbottorf@xxxxxxxxxxxxxxxxxx