Rack-Mounting Guidelines; Precautions For Rack-Mounting; Rack Selection Guidelines - Cisco ASR 903 Installation Manual

Chapter 2 Preparing for Installation
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 ASR 903 Router.
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 ASR 903 Router
operating environment.

Rack-Mounting Guidelines

The following sections provide guidelines for rack-mounting the Cisco ASR 903 Router:
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Precautions for Rack-Mounting

The following rack-mount guidelines are provided to ensure your safety:
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Rack Selection Guidelines

The Cisco ASR 903 Router can be mounted in 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.
When mounting a chassis in any type of rack equipment, ensure that the inlet air to the chassis does not
Caution
exceed 65 degrees C.
OL-25178-03
Precautions for Rack-Mounting, page 2-15
Rack Selection Guidelines, page 2-15
Equipment Rack Guidelines, page 2-16
Do not move large racks by yourself. Due to the height and weight of a rack, a minimum of two
people are required to accomplish this task.
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 rack.
When mounting the Cisco ASR 903 Router in a partially filled rack, load the rack from the bottom
to the top, with the heaviest component at the bottom of the rack.
If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing
the unit in the rack.
Cisco ASR 903 Router Hardware Installation Guide
Site Planning
2-15