Re: [802.3BA] XR ad hoc Phone Conference Notice

[Petar Pepeljugoski <petarp@xxxxxxxxxx>]

Frank,

If I interpret correctly, you are saying
that all users should amortize the cost of very few who need extended reach.

We need to be careful how we proceed
here - we should not repeat the mistakes of the past if we want successful
standard.

Regards,

Peter

Petar Pepeljugoski
IBM Research
P.O.Box 218 (mail)
1101 Kitchawan Road, Rte. 134 (shipping)
Yorktown Heights, NY 10598

e-mail: petarp@xxxxxxxxxx
phone: (914)-945-3761
fax:        (914)-945-4134

From:	Frank Chang <ychang@xxxxxxxxxxx>
To:	STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
Date:	07/09/2008 10:29 PM
Subject:	Re: [802.3BA] XR ad hoc Phone Conference Notice

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Hi Jeff;
 
Thanks for your comment. You missed
one critical point that there is cost increase from OM3 to OM4. If you
take ribbon cable cost in perspective, OM4 option is possibly the largest
of the 4 options. 
 
Besides, the use of OM4 requires
to tighten TX specs which impact TX yield, so you are actually compromising
the primary goal. 
 
Frank

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From: Jeff Maki [mailto:jmaki@xxxxxxxxxxx]
Sent: Wednesday, July 09, 2008 7:02 PM
To: STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3BA] XR ad hoc Phone Conference Notice

Dear MMF XR Ad Hoc Committee Members,
 
I believe our current objective of “at least
100 meters on OM3 MMF” should remain as a primary goal, the baseline.
 Support for any form of extended reach should be considered only
if it does not compromise this primary goal.  A single PMD for all
reach objectives is indeed a good starting premise; however, it should
not be paramount.  In the following lists are factors, enhancements,
or approaches I would like to put forward as acceptable and not acceptable
for obtaining extended reach.
 
Not Acceptable:
1. Cost increase for the baseline PMD (optic)
in order to obtain greater than 100-meter reach
2. EDC on the system/host board in any case
3. CDR on the system/host board as part of
the baseline solution
4. EDC in the baseline PMD (optic)
5. CDR in the baseline PMD (optic) 
 
Acceptable:
1. Use of OM4 fiber
2. Process maturity that yields longer reach
with no cost increase
 
In summary, we should not burden the baseline
solution with cost increases to meet the needs of an extended-reach solution.
 
Sincerely,
 
Jeffery Maki
 
 
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Jeffery J. Maki, Ph.D.
Principal Optical Engineer
Juniper Networks, Inc.
1194 North Mathilda Avenue
Sunnyvale, CA  94089-1206
Voice +1-408-936-8575
FAX +1-408-936-3025
www.juniper.net
jmaki@xxxxxxxxxxx
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