Cisco ASR-920-4SZ-A Hardware-Installationshandbuch - Seite 38
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Site Planning
To resolve these problems, you need specialized knowledge and equipment that could consume
substantial time and money. However, you can ensure that you have a properly grounded and shielded
electrical environment, paying special attention to the need for electrical surge suppression.
For information about the electrode magnetic compliance standards supported on the
Cisco ASR 920 Series Router, see the Regulatory Compliance and Safety Information for the
Cisco ASR 920 Series Aggregation Services Router document.
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 ASR 920 Series 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 920 Series Router operating environment.
Rack-Mounting Guidelines
The following sections provide guidelines for rack-mounting the Cisco ASR 920 Series Router:
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Precautions for Rack-Mounting
The following rack-mount guidelines are provided to ensure your safety:
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Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide
2-16
Precautions for Rack-Mounting, page 2-16
Rack Selection Guidelines, page 2-17
Equipment Rack Guidelines, page 2-17
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 920 Series 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.
Chapter 2
Preparing for Installation
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