[EFM] Re: Moving forward on extended temperature range optics
[Date: 01/17/2003 From Seto]
I have never understood why we need extended temperature
standard for PMD only. I believe we don't have extended
temperature standard for 802.3 MAC or PCS/PMA. Would a switch
or PHY chip that does not hold under extended temparature be
compatible with 802.3ah?
We might better off to specify extended temperature operation
classes rather than specifying extended temperature optics. A
box or a syste, rather than optical component only, needs to
meet these specs to claim the compatibility with a specific
exteded temperature class.
> 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
> >http://webapp.etsi.org/action%5COP/OP20030321/en_3000190104v020101o.pdf .
> >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
> >https://domino.iec.ch/webstore/webstore.nsf/artnum/019208 .
> Bruce Tolley
> Senior Manager, Emerging Technologies
> Gigabit Systems Business Unit
> Cisco Systems
> 170 West Tasman Drive
> MS SJ H2
> San Jose, CA 95134-1706
> internet: btolley@xxxxxxxxx
> ip phone: 408-526-4534