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Preparing for Installation
Radio Frequency Interference
When electromagnetic fields act over a long distance, radio frequency interference (RFI) may be propagated.
Building wiring can often act as an antenna, receiving the RFI signals and creating more EMI on the wiring.
If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the plant
wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a high-quality
twisted-pair cable with one ground conductor for each data signal.
Lightning and AC Power Fault Interference
If signal wires exceed the recommended cabling distances, or if signal wires pass between buildings, you
should consider the effect that a lightning strike in your vicinity might have on the Cisco NCS 4201.
The electromagnetic pulse (EMP) generated by lightning or other high-energy phenomena can couple enough
energy into unshielded conductors to damage or destroy electronic equipment. If you have previously
experienced such problems, you should consult with RFI and EMI experts to ensure that you have adequate
electrical surge suppression and shielding of signal cables in your Cisco NCS 4201 operating environment.
Rack-Mounting Guidelines
The following sections provide guidelines for rack-mounting the Cisco NCS 4201:
Precautions for Rack-Mounting
The following rack-mount guidelines are provided to ensure your safety:
• Ensure that the rack is level and stable before extending a component from the rack.
• Ensure that proper airflow is provided to the components in the rack.
• Do not step on or stand on any component or system when servicing other systems or components in a
• When mounting the Cisco NCS 4201 in a partially filled rack, load the rack from the bottom to the top,
• If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the
Rack Selection Guidelines
The Cisco NCS 4201 can be mounted on most two-post or four-post, 19-inch equipment racks that comply
with the Electronic Industries Association (EIA) standard for equipment racks (EIA-310-D 19-inch). The rack
must have at least two posts with mounting flanges to mount the chassis.
Caution
When mounting a chassis in any type of rack equipment, ensure that the inlet air to the chassis does not exceed
70 C.
The distance between the center lines of the mounting holes on the two mounting posts must be 18.31 inch ±
0.06 inch (46.50 cm +/- 0.15 cm). The rack-mounting hardware included with the chassis is suitable for most
19-inch equipment racks.
Consider installing the Cisco NCS 4201 in a rack with the following features:
• NEBS-compliant, 23-inch wide (48.3-cm) rack.
rack.
with the heaviest component at the bottom of the rack.
unit in the rack.
Radio Frequency Interference
Cisco NCS 4201 Hardware Installation Guide
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