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Installing the Cisco 1-, 2-, and 4-Port Serial Network Interface Modules for Cisco 4400 Series ISRs
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Preventing Electrostatic Discharge Damage
Electrostatic discharge can damage equipment and electrical circuitry. Electrostatic discharge occurs
when electronic printed circuit cards, such as those used in Installing the Cisco Multiprotocol
Synchronus Serial NIM, are improperly handled and can result in complete or intermittent equipment
failure. Always observe the following electrostatic discharge damage (ESD) prevention procedures when
installing, removing, or replacing any electronic printed circuit cards:
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Caution
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General Maintenance Guidelines
The following maintenance guidelines apply to the Cisco 1-, 2-, and 4-Port Serial Network Interface
Modules for Cisco 4400 Series ISRs:
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Locate the emergency power-off switch in the room before you start working. If an electrical
accident occurs, shut the power off.
Before working on the router, turn off the power and unplug the power cord.
Disconnect all power sources before doing the following:
Installing or removing a router chassis
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Working near power supplies
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Do not work alone if potentially hazardous conditions exist.
Always check that power is disconnected from a circuit.
Remove possible hazards from your work area, such as damp floors, ungrounded power extension
cables, or missing safety grounds.
If an electrical accident occurs, proceed as follows:
Use caution; do not become a victim yourself.
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Turn off power to the room using the emergency power-off switch.
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Determine the condition of the victim and send another person to get medical aid or call for
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help.
Determine if the person needs rescue breathing or external cardiac compressions; then take
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appropriate action.
Make sure that the router chassis is electrically connected to earth ground.
Wear an ESD-preventive wrist strap, and make sure that it makes good contact with your skin.
Connect the wrist strap clip to an unpainted portion of the chassis frame to channel unwanted ESD
voltages to ground.
The wrist strap and clip must be used correctly to ensure proper ESD protection. Periodically
confirm that the resistance value of the ESD-preventive wrist strap is between 1 and 10
megohms (Mohm).
If no wrist strap is available, ground yourself by touching the metal part of the router chassis.
Keep the router chassis area clear and dust-free during and after installation.
If you remove the chassis cover for any reason, store it in a safe place.
Recommended Practices for Cisco 1-, 2-, and 4-port Serial NIMs
Installing the Cisco Multiprotocol Synchronus Serial NIM
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