Correct I am speaking as a Representative of Cisco and stating that operation above the altitude stated in the datasheet is outside of the stated safety conformance of UL 60950-1. The environmental specifications in the datasheet are the definitive l...

Not necessarily air gaps per-se cooling plays a part as well. however design specs are in conformance with UL 60950-1 operation above 3000M would be outside the safety parameters of UL 60950-1.

It is 2 fold, first the dielectric (insulating strength) of air decreases with altitude so where air gaps are part of a design from an insulation standpoint this needs to be a consideration.   Secondly as altitude increases air is less dense and does...

How many devices is this DCNM server currently managing? Which DB software are you using ?