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

Sorry, but you seem to have deemed ALL possibilities for extending the link length unacceptable. To be clear:
1. Use of OM4 fiber with the current baseline proposal specs WILL NOT yield extended link lengths.
2. 100m is unacceptable to many of our customers as the only option - we would oppose that by itself.
3. Most customers want a single PMD.
4. The 20% premium at the module level seems to be in the noise for 40100G optics.
We need to discuss this further all the call today.
Best regards,

From: Jeff Maki [mailto:jmaki@xxxxxxxxxxx]
Sent: Wednesday, July 09, 2008 10:02 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)



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.




Jeffery Maki




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