Cisco 3745 Installationsanleitung PDF herunterladen (Seite 4)

Installing Field-Replaceable Units in Cisco 3745 Routers

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Preventing Electrostatic Discharge Damage

• Disconnect all power before doing the following:

–

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

• Do not work alone if potentially hazardous conditions exist.

• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power

extension cables, and missing safety grounds.

• Never assume that power is disconnected from a circuit. Always check.

• 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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Turn off power to the system.

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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.

–

Determine if the person needs rescue breathing or external cardiac compressions; then take

appropriate action.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when

electronic printed circuit cards are improperly handled and can result in complete or intermittent

failures. Always follow ESD prevention procedures when removing and replacing cards. Ensure that the

router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring

that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely

channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist

strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the

metal part of the chassis.

Caution To avoid damaging electrostatic discharge (ESD)-sensitive components, ensure that you have discharged

all static electricity from your body before opening the chassis.

Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and

10 megohms (Mohms).

Caution Before opening the chassis, be sure that you have discharged all static electricity from your body and the

power is off.

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Cisco 3745 Installationsanleitung Seite 4