Cisco 1710 Technické informace stáhnout pdf (Strana 9)

Installing and Upgrading Memory in Cisco 1700 Series Routers

OL-3892-02

Opening the Chassis of a Desktop Router

• Disconnect all power before doing the following:

–

Installing or removing a router chassis

–

Working near power supplies

• Do not work alone if potentially hazardous conditions exist.

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

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

extension cables, and missing safety grounds.

If an electrical accident occurs, proceed as follows:

• Use caution; do not become a victim yourself.

• Turn off power to the router.

• If possible, send another person to get medical aid. Otherwise, determine the condition of the victim

and then call for help.

• Determine if the victim 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 can occur when

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 guard against ESD damage and shocks, the wrist strap and cord must be used

properly. If no wrist strap is available, ground yourself by touching the metal part of the chassis.

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

10 megohms (Mohm).

Opening the Chassis of a Desktop Router

To upgrade router memory, you must open the chassis. Follow the steps below to open the chassis of a

Cisco 1720, Cisco 1721, Cisco 1750, or Cisco 1751 router.

Opening the chassis requires a number 1 Phillips screwdriver.

Step 1 Make sure the router is turned off and is disconnected from the power supply.

Step 2 Turn the router upside down, and rest the router on a flat surface.

Step 3 Use the Phillips screwdriver to remove the four screws that hold the top and bottom of the chassis

together, as shown in Figure 1.

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Cisco 1710 Technické informace Strana 9