Hello Jeffrey, Basically, to demonstrate compliance with "GR-63-CORE", no altitude testing is required assuming you have passed the standard temperature and humidity profile. The rationale is that, at that altitude, heating the facility will be the primary concern, not cooling it. According to the national weather service, the expected ambient high temperature at that altitude is less than 20C. If a facility at that altitude lost HVAC, it probably would start cooling off rather than heating up. Thus the reason there is no test method. It was simply intended as a design criteria that should be considered.
However you can demonstrate compliance above and beyond the current GR-63-CORE for altitude by raising the temperature limits during the operational temperature and humidity testing by 1 degree C per 1000 foot of altitude that you want to simulate. This assumes you do not have components that may be altitude sensitive. It also assumes worst case conditions for the amount of heat that your product may be generating. However, some ILEC's may want to see an actual altitude test depending upon the equipment type and application. In this case Richard Kluge at Telcordia has developed a "proposed" altitude exposure test and he has a paper that was written in December of 1999 covering the rationale etc. Telcordia now has an altitude chamber and is conducting a study to determine if altitude is a potential concern based on the design of modern telecommunications equipment for the next revision of GR-63-CORE. Attached is the Telcordia document from Richard Kluge, note that the temperatures recommended for testing at altitude are much lower than 50C, and thus are looking more at determining component altitude sensitivity rather than reduced air density and temperature. <<Adobe Portable Document>> These are solely my opinions, and not necessarily those of my employer Jim Jim Wiese NEBS Project Manager/Compliance Engineer ADTRAN, INC. 901 Explorer Blvd. P.O. Box 140000 Huntsville, AL 35814-4000 256-963-8431 256-963-8250 fax [email protected] > ---------- > From: Collins, Jeffrey[SMTP:[email protected]] > Reply To: Collins, Jeffrey > Sent: Monday, September 25, 2000 8:36 AM > To: '[email protected] ' > Subject: NEBS: GR-63 Altitude Test Profile > > > Group, > > GR-63 sections 4.1.3 & 5.1 do not give a definitive testing profile for > Altitude testing. If you have completed this test what profile did you > use? > Is there a customer specification from an RBOC or CLEC that you found to > be > definitive. It appears that by only addressing these sections you could > have > to retest down the road for a customer located in a high altitude > environment. Which Telco has the most stringent internal specifications > for > this test? > > Points to be considered are: > > * Max Altitude > > * Temperature at max Altitude > > * Relative Humidity > > * Length of time at Max Altitude > > > > Thanks in advance, > > > Jeffrey Collins > MTS, Principal Compliance Engineer > Ciena Core Switching Division > [email protected] > www.ciena.com > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > >
alt-12-31-99.pdf
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