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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-04
Chapter 2 Preparing for Installation
Safety Guidelines
Power Supply Considerations
Check the power at your site to ensure that you are receiving clean power (free of spikes and noise).
Install a power conditioner if necessary.
Warning
This equipment is designed for connection to TN and IT power systems.
Statement 16
Preventing ESD Damage
Warning
This equipment needs to be grounded. Use a green and yellow 6 AWG ground wire to connect the host
to earth ground during normal use.
Statement 383
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.
• When installing a component, use any available ejector levers or captive installation screws to
properly seat the bus connectors in the backplane or midplane. These devices prevent accidental
removal, provide proper grounding for the system, and help to ensure that bus connectors are
properly seated.
• When removing a component, use available ejector levers or captive installation screws, if any, to
release the bus connectors from the backplane or midplane.
• Handle components by their handles or edges only; do not touch the printed circuit boards or
connectors.
• 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.
Note For the safety of your equipment, periodically check the resistance value of the antistatic wrist strap. It
should be between 1 and 10 Mohm.