Vertical 6509 are NEB compliant and they are called 6509-NEB. 6509 Horizontal are not NEB compliant.
This switch complies with Network Equipment Building Systems (NEBS) (Zone 4 per GR-63-Core) in the following areas:
•Earthquake environment and criteria
•Office vibration and criteria
•Transportation vibration and criteria
Shock
•Operational—5 G 30 ms, half-sine (IEC 68-2-27)
•Non-operational—20 G, 7.5 ms, trapezoidal
Vibration
Operational—3 Hz to 500 Hz,
Power Spectral Density (PSD)-0.0005 G2/Hz at 10 Hz and 200 Hz. 5 dB/octave roll off at each end. 0.5 hours per axis (1.12 Grms).
The Catalyst 6509-NEB switch chassis is designed to install in standard 19-inch equipment racks that meet ANSI/EIA 310-D, IEC 60297, and ETS 300-119 standards.
The 6509 Horizontal is not NEB compliant and therefore does not adhere to the standards above. Other than that they both do the same funtionality.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/6000hw/6500_ins/01over.htm#wp1079450
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