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RE: [EFM] Moving forward on extended temperature range optics


I too will be out of the country next week. Please put me on the e-mail list
so that I will see conference call info on this topic.

Please pass along to the group that BellSouth strongly supports an extended
temperature range requirement. BellSouth would like to see these numbers
called out in the specification as normative numbers (please keep in mind
that BellSouth and many of the other service providers think in terms of
ambient temperature and not case temperature...however it would seem that
these two items are strongly related).

I will also attach the short temperature presentation that I displayed at
the Vancouver meeting. This is the PowerPoint that we provide to all of our
vendors when they come into the lab regarding temperature requirements (this
is in addition to some GRs that we point to ... GR-63 CORE and GR-1089 I

Hope this helps,


Brian Ford
BellSouth Telecommunications
Science and Technology - Exploratory Development
+1 404 332 2217 

-----Original Message-----
From: Bruce Tolley [mailto:btolley@xxxxxxxxx]
Sent: Thursday, January 16, 2003 2:59 PM
Subject: [EFM] Moving forward on extended temperature range optics

Piers and all

I gave my self the action to help move forward the outstanding issue 
regarding extended temperature ranges for P2P and P2MP optics

We have an objective to include in our specification of PHYs, support for 
extended temperature range optics

The task force has in the past passed motions to specify EFM optics at -40 
to +85 C

Network operators have on multiple occasions communicated the requirement 
for extended temperature solutions.

As recently as the Vancouver meeting, several box vendors (including me)b 
communicated the requirement for extended temperature range optics. We need 
to agree on a path to move forward.

So if interested parties want to forward to me their email addresses, I 
will host a conference call next week dedicated to this issue. I think we 
need to focus on a test specified in each PMD clause, to agree on the 
ranges for OLT and ONU optics, to consider the possible special case of 
bidis that include 1550 nm DFBs, and to identify any PMD that might only 
need to be supported at standard, commercial temperatures.


Bruce Tolley
Cisco Systems

  At 04:11 PM 1/8/2003 +0100, piers_dawe@xxxxxxxxxxx wrote:

>G.983.3 refers to ETS 300 019.  This is a very readable series of 
>documents from the European Telecommunications Standards Institute, giving 
>a classification of environmental conditions, e.g. weatherprotected 
>locations, non-weatherprotected, underground.  It uses four classes of 
>climatic conditions:
>         "applies to most of Europe"
>         extended
>         extremely cold
>         extremely warm dry
>And even better, up-to-date drafts are available on the web, e.g. at
> .
>It is not the business of 802 to pick between these classes but we can 
>refer the readers of our standard to this information.
>ITU-T and ANSI T1 do not have similar documents.
>Both G.983.3 and refer to IEC 60721, classification of environmental 
>IEC 60721-3-4 - Ed. 2.0  Classification of environmental conditions - Part 
>3: Classification of groups of environmental parameters and their 
>severities - Section 4: Stationary use at non-weatherprotected 
>locations  1995-01 is available for CHF99 at 
> .

Bruce Tolley
Senior Manager, Emerging Technologies
Gigabit Systems Business Unit
Cisco Systems
170 West Tasman Drive
San Jose, CA 95134-1706
internet: btolley@xxxxxxxxx
ip phone: 408-526-4534

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BellSouth Temperature Requirements.ppt