David,
This particular test profile is one which I have recently tried to
shed some light on as well. I am curious where you come to the conclusion
that the application of the criteria for altitude references Table 4.5. The
requirement (R4-8 anyway) states, "All equipment shall be functional within
the limits specified in Table 4-4 when installed at elevations between 60 m
(197 ft) below sea level and
1800 m (5905 ft) above sea level." I would think this would be overkill as
you seem to imply that this would encompass another 8-day test profile.
Referencing Table 4.5 would also imply that the temperature limit at 4000M
would be 55 degC where the limits of Table 4.4 clearly state a temperature
limit of 50 degC.
It would be greatly appreciated if anyone else could share their
experiences on this requirement. What do the RBOC's expect to see for test
results? I figured I'd post this on the NEBS Forum as well to reach a wider
audience.
Thx,
Joe
-----Original Message-----
From: David Spencer [mailto:dspen...@oresis.com]
Sent: Monday, September 25, 2000 12:42 PM
To: 'Collins, Jeffrey'; 'emc-p...@ieee.org '
Subject: RE: NEBS: GR-63 Altitude Test Profile
Hi Jeffrey,
Our friends at Telcordia do seem to enjoy listing requirements where we
would least expect them. GR63 is no exception. For altitude, the limits
called out in R4-8 [74] and O4-10[76] for Table 4-4 are the general
temperature/humidity limits for long and short term exposure. The
application of those criteria can be found in Table 4.5 in the 182 hour
profile.
It is my belief that you test to at 4000m using the profile from table 4.5,
unless you wanted to make a profile of your own that covered the same ground
over a longer period of time, using Table 4-4 for the limits, rates of
change, and duration. If the EUT cannot tolerate the resulting temperature
rise from the 4000m altitude, it will be necessary to retest at 1800 to meet
R4-8. The failure is documented in the NEBS data submitted to the carrier
who decides if it is something he wants you to do something about before he
purchases you equipment. I do not think it is necessary to test 1800m if
you have passed the table 4-5 profile at 4000m.
Don't forget: Objective requirements are not elective. The tests must be
performed and the results documented. It is by this means that decisions
are made about making the objective a mandatory requirement down the road.
Good Luck!
Dave Spencer Compliance Engineer
Oresis Communications, Inc.
14670 NW Greenbrier Parkway, Beaverton, OR 97006
* dspen...@oresis.com * http://www.oresis.com
* (503) 466-6289 * (503) 533-8233
-----Original Message-----
From: Collins, Jeffrey [mailto:jcoll...@ciena.com]
Sent: Monday, September 25, 2000 6:36 AM
To: 'emc-p...@ieee.org '
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
4000m
* Temperature at max Altitude
Profile in Table 4-5
* Relative Humidity
Profile in Table 4-5
* Length of time at Max Altitude
182 hrs
Thanks in advance,
Jeffrey Collins
MTS, Principal Compliance Engineer
Ciena Core Switching Division
jcoll...@ciena.com
www.ciena.com
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