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| Jonathan King <jking@BIGBEARNETWORKS.COM>
Sent by: owner-stds-802-3-10gmmf@LISTSERV.IEEE.ORG 08/20/2004 11:59 AM
|
To: STDS-802-3-10GMMF@LISTSERV.IEEE.ORG cc: (bcc: Paul F Kolesar/CommScope) Subject: Re: [10GMMF] 62MMF connector loss and draft test link config |
Jonathan
tel: 1 408 524 5110
e-mail: jking@bigbearnetworks.com
fax: 1 408 739 0568
Jonathan King
Director, Optical
Systems
BigBear Networks
345 Potrero Avenue
Sunnyvale, CA 94085
-----Original Message-----
From: Paul Kolesar [mailto:PKOLESAR@SYSTIMAX.COM]
Sent: Thursday, August 19, 2004 8:30 PM
To: STDS-802-3-10GMMF@listserv.ieee.org
Subject: Re: [10GMMF] 62MMF connector loss and draft test link config
David,
thanks for this work. The model I have for 62.5 agrees with your
analysis for the steady state launch condition. Please confirm that
in your model the steady state condition represents a 70/70 launch (i.e.
70% of maximum core diameter and 70% of maximum NA).
I have a comment regarding the 7 um limit. The 7 um value was chosen for
the OM3 work because it represented 0.5 dB for 50 um fiber under steady
state conditions. The remaining 0.25 dB needed to reach the 0.75
dB limit was allotted to mechanisms other than lateral offset. The
equivalent offset for 62 um fiber is 9 um from your graph. Thus connectors
need to be of tighter tolerance for 50 um fiber than for 62 um fiber. As
product lines of cabling vendors in North America and other parts of the
world have shifted to include a larger mix of 50 um fiber, the tolerance
for connectors needed to be tightened to maintain good performance. Fortunately
progress in connector technology permitted this. The result is that
over time connectors have gotten better. This leads to an interesting
issue when dealing with legacy plant. The older plant likely has poorer
connectors due to both tolerance and wear. I think this leads to
a need for considering different values for legacy 50 and 62 um plants.
To address these considerations, I would suggest that the limit for
62 um fiber be set at 9 um and that for 50 set at 7 um.
Regards,
Paul Kolesar
SYSTIMAX® SOLUTIONS
1300 East Lookout Drive
Richardson, TX 75082
Phone: 972.792.3155
Fax: 972.792.3111
eMail: pkolesar@systimax.com
| David Cunningham <david_cunningham@AGILENT.COM>
Sent by: owner-stds-802-3-10gmmf@listserv.ieee.org 08/18/2004 02:24 PM
| To: STDS-802-3-10GMMF@listserv.ieee.org cc: (bcc: Paul F Kolesar/CommScope) Subject: [10GMMF] 62MMF connector loss and draft test link config |