Hi Eric, Same Jack...
Thanks for the response. I have the Telcordia docs and I'm aware of the temp ranges. We are designing a unit that may be used in an outside enclosure. Qwest, for one, told the NEBS2001 Conference a few weeks ago that they want to see GR-487 testing to go to +75degC because of the temps they have seen in their enclosures in AZ. The laser diodes we use will work fine at +75 but not for very long. The needle in the haystack is trying to find out, for example, how many days an enclosure sees +75, then +65, etc. Life span numbers will be unfairly low if we assume +75 to be the worst case ambient. Take care, Jack -----Original Message----- From: Eric Petitpierre [mailto:eric.petitpie...@pulse.com] Sent: Monday, November 12, 2001 3:04 PM To: nebs@world.std.com Subject: Re: CO temp data Hi Jack, Would this by any chance be the Jack Murphy that used to work at DSG about ten years ago? To answer your questions: GR-63-CORE deals with c.o. environmental GR-487 deals with cabinet enclosures Both specs available from Telcordia at: http://telecom-info.telcordia.com/site-cgi/ido/index.html Operating c.o. temp is 5 to 40 deg. C Short term c.o. is -5 to 55 deg C ( shelf equipmen As for the outside cabinet, interior temp could easily get a 20 deg C rise from ambient, dependig on wattage and cabinet surface area. Solar loading can also increase it another 20 degrees. A lot will depend on whether enclosure has a heat exchanger, and how efficient it is. So we can expect up to 85 deg. C. A big deciding factor would be where the end user is. Alos if they adhere to the Telcordia Standards/Recommendations. If customer is in North Dakota for Arizona will make all the difference. Perhaps you can have optional enclosure kits for extremes. (Heat exchanger for Arizona models and battery heaters for North Dakota customers. Hope this answers your questions. if if doesn't, or if you have others, let me know, Regards, Eric Petitpierre Pulsecom Herndon, VA
