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• Place a removed component board side up on an antistatic surface or in a static-shielding container. If
you plan to return the component to the factory, immediately place it in a static-shielding container.
• Avoid contact between the printed circuit boards and clothing. The wrist strap only protects components
from ESD voltages on the body; ESD voltages on clothing can still cause damage.
• Never attempt to remove the printed circuit board from the metal carrier.
For the safety of your equipment, periodically check the resistance value of the antistatic wrist strap. It should
be between 1 and 10 Mohm.
Note
Site Planning
The following sections describe how to plan for the installation of the Cisco ASR 903 Router:
General Precautions
Observe the following general precautions when using and working with your Cisco ASR 903 Router system:
• Keep your system components away from radiators and heat sources and do not block cooling vents.
• Do not spill food or liquids on your system components and never operate the product in a wet
environment.
• Do not push any objects into the openings of your system components. Doing so can cause fire or electric
shock by shorting out interior components.
• Position system cables and power supply cables carefully. Route system cables and the power supply
cable and plug so that they cannot be stepped on or tripped over. Be sure that nothing else rests on your
system component cables or power cable.
• Do not modify power cables or plugs. Consult a licensed electrician or your power company for site
modifications. Always follow your local and national wiring rules.
• If you turn off your system, wait at least 30 seconds before turning it on again to avoid system component
damage.
Site Planning Checklist
Use the following checklist to perform and account for all the site planning tasks described in this chapter:
• The site meets the environmental requirements.
• The site’s air conditioning system can compensate for the heat dissipation of the Cisco ASR 903 Router.
• The floor space that the Cisco ASR 903 Router occupies can support the weight of the system.
• Electrical service to the site complies with the requirements.
• The electrical circuit servicing the Cisco ASR 903 Router complies with the requirements.
• Consideration has been given to the console port wiring and limitations of the cabling involved, according
to TIA/EIA-232F.
• The Cisco ASR 903 Router Ethernet cabling distances are within limitations.
• The equipment rack in which you plan to install the Cisco ASR 903 Router complies with requirements.
• In selecting the location of the rack, careful consideration has been given to safety, ease of maintenance,
and proper airflow.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
57
Preparing for Installation
Site Planning