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Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
OL-23778-01
Chapter 2 Preparing to Install the Router
Safety Guidelines
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Working on or near power supplies.
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Installing or removing a router chassis, or network processor module.
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Performing most hardware upgrades.
• Never install equipment that appears damaged.
• Carefully examine your work area for possible hazards, such as wet floors, ungrounded power
extension cables, and missing safety grounds.
• Never assume that power is disconnected from a circuit; always check.
• Never perform any action that creates a potential hazard to people or makes the equipment unsafe.
• If an electrical accident occurs, proceed as follows:
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Use caution, and do not become a victim yourself.
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Switch off power to the router.
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If possible, send another person to get medical aid. Otherwise, determine the condition of the
victim, and then call for help.
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Determine whether the person needs rescue breathing or external cardiac compressions; then
take appropriate action.
In addition, use the following guidelines when working with any equipment that is disconnected from a
power source, but still connected to telephone wiring or network cabling:
• Never install telephone wiring during a lightning storm.
• Never install telephone jacks in wet locations unless the jack is specifically designed for it.
• Never touch un-insulated telephone wires or terminals unless the telephone line is disconnected at
the network interface.
• When installing or modifying telephone lines, use caution.
Preventing Electrostatic Discharge Damage
Electrostatic Discharge (ESD) can damage equipment and impair electrical circuitry. ESD can occur
when electronic printed circuit cards are improperly handled, and can cause complete or intermittent
failures. When removing and replacing modules, always follow ESD prevention procedures:
• Ensure that the router chassis is electrically connected to earth ground.
• Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. To channel unwanted
ESD voltages safely to ground, connect the clip to an unpainted surface of the chassis frame. To
guard against ESD damage and shocks, the wrist strap and cord must operate effectively.
• If no wrist strap is available, ground yourself by touching a metal part of the chassis.
Caution For the safety of your equipment, periodically check the resistance value of the antistatic wrist strap. It
should be between 1 and 10 Mohm.