Cisco 10008 Router Hardware Installation Guide
Maintaining the Cisco 10008 Router
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Maintaining the Cisco 10008 Router

Table Of Contents

Maintaining the Cisco 10008 Router

Required Maintenance Tools

Shutting Down the System

Backing Up the PCMCIA Card

Removing and Replacing Field-Replaceable Units

Front Cover Procedures

Removing the Front Cover

Replacing the Front Cover

Replacing the Air Filter

Replacing an Air Filter in a Chassis that Uses a Filter Tray

Replacing an Air Filter in a Chassis with Release Tabs

Replacing the Blower Module

Installing Power Entry Modules

Installing a Second DC PEM

Replacing a DC PEM

Installing a Second AC PEM

Replacing an AC PEM

Connecting Alarm Indicators

Removing and Replacing the PRE

Removing and Installing a PCMCIA Flash Memory Card

Upgrading SDRAM on the PRE

Removing and Installing DIMMS

Troubleshooting the DIMM Installation


Maintaining the Cisco 10008 Router


The Cisco 10008 router is configured to your order and ready for installation when it arrives. After you install the system, you may have to perform specific maintenance procedures to ensure the router is operating properly. These procedures can include routine maintenance such as replacing the filter, upgrading system components, or replacing components with field replaceable units (FRUs). This chapter contains the information necessary to perform that maintenance for the Cisco 10008 router.


Note Detailed, up-to-date instructions are also shipped with all FRUs and upgrade kits.


System components fall into two categories:

hot-swappable components that do not require you to power off the system before replacing them

those components that do require you to power off the system before you replace them.

For example, all line cards are hot-swappable and can be replaced without powering off the system, but you must power off the system before replacing a single power entry module (PEM) or a single Performance Routing Engine (PRE).


Note To prevent alarms from activating, you must administratively shut down a line card before hot swapping it.


This chapter contains the following removal and installation information:

Front Cover Procedures

Replacing the Air Filter

Replacing the Blower Module

Installing Power Entry Modules

Removing and Replacing the PRE

Removing and Installing DIMMS

For information on removing and installing line cards, see the Cisco 10000 Series Routers Line Card Hardware Installation Guide.

Read "Preparing for Installation," and check the safety information in "Installing the Cisco 10008 Router" before beginning any of the following procedures. Also see the Regulatory Compliance and Safety Information for the Cisco 10000 Series Routers document.

Spare Parts

Service providers usually draw on their own experience with similar equipment as they try to determine the number of spare parts of a given item to keep on hand. In developing a strategy for spare parts, the service providers must

Evaluate the criticality of the equipment.

Estimate the mean time between failures, a key component of any spares strategy.

Calculate the number of production routers (and associated components) they need to have on hand. For example, if they have the critical mass to shift capacity to other locations or other devices, they may be able to carry fewer spares.

Service providers may also subscribe to services that supply them with replacement parts, sometimes with turnaround times as short as 4 hours.

Redundancy

Service providers trying to decide on the level of redundancy appropriate for their operations must examine their business models. The service provider invests more heavily in high network reliability if the business model

Calls for protected services

Provides customer service-level agreements

Accommodates customers that require a high degree of reliability

Emphasizes overall reliability as opposed to cost

In addition, the service provider discusses the situation with the supplier to identify those software and hardware features likely to experience the most stress and thus to have the shortest mean time between failures. The point is to determine, not just whether or not redundancy is to be used, but also the quantity to be used (1:1, 2:1, or greater).

Some service providers have redundant chassis, but not redundant routing engines. This approach gives them increased flexibility, so that they can provide reliable service and accommodate a growing number of customers. Customers requiring the highest levels of network reliability and availability often add redundancy by connecting to two different service providers.

Required Maintenance Tools

The only tools required to perform the maintenance procedures described in this chapter are:

A Number 2 Phillips screwdriver

A flat-blade screwdriver

An electrostatic discharge (ESD) grounding strap

Shutting Down the System

Although most components in the Cisco 10008 router are hot-swappable, you may have to shut down the system under certain circumstances. Use the following procedure to shut down the system:


Step 1 Notify appropriate personnel that you plan to shut down the system and that the shutdown results in total loss of service. Appropriate personnel includes the regional alarm or network monitoring center, central office personnel, and key customers.

Step 2 Before you shut down the router, use the copy command to save any configuration changes to NVRAM, and also, if you wish, to a Flash disk (see "Relocating the Configuration to a Flash Disk" section for instructions about using the copy command).

Step 3 Power down the system by setting the power switch on all PEMs to the off (0) position (your system can be configured with one or two PEMs).


Backing Up the PCMCIA Card

Cisco recommends that you create a duplicate PCMCIA card that contains the current boot software image and the current software configuration. You can use the backup card to quickly recover from a major system failure. You can also use a backup card to load a new PRE module and avoid the time-consuming reconfiguration process. For instructions to create a backup flash disk, see "Relocating the Configuration to a Flash Disk" section.

Removing and Replacing Field-Replaceable Units

This section contains the procedures to remove and replace all of the field replaceable units (FRUs) for the Cisco 10008 router. Before beginning any FRU procedure, be sure you are familiar with the safety precautions outlined in "Preparing for Installation."


Note The illustrations in this guide depict the original Cisco 10008 chassis. Your chassis may have slight differences, but the procedures are the same.


Front Cover Procedures

The original Cisco 10008 router is equipped with a plastic front cover that ensures proper air flow through the system and protects the cables and connectors from damage. The following procedures describe how to remove and replace the front cover.


Note Your router may not have a front cover. Only the original Cisco 10008 chassis was equipped with a plastic front cover. Later redesigned models do not use a front cover.


Removing the Front Cover

Use the following procedure to remove the front cover from the chassis:

Figure 5-1 Unlocking the Bezel Plugs


Step 1 Unlock a bezel plug by wedging the tip of a flat-blade screwdriver between the top and bottom sections of the plug, and then rotating the screwdriver to loosen the top portion of the plug (Figure 5-1).

Repeat this procedure for all four bezel plugs, and then remove the plugs.

Figure 5-2 Removing the Front Cover

Step 2 Remove the cover by lifting it up slightly and then pulling it toward you (Figure 5-2).


Replacing the Front Cover

Use the following procedure to replace the front cover on the chassis:

Figure 5-3 Attaching the Cover to the Chassis


Step 1 Slide the cover onto the four corner posts of the chassis and then push down so that the posts are seated in the grooves above the cover holes (Figure 5-3).

Figure 5-4 Inserting Bezel Plugs

Step 2 Insert a bezel plug into each hole below the corner posts and press in the top of each bezel plug to secure the front cover to the chassis (Figure 5-4).


Replacing the Air Filter

If the air filter is dirty or clogged, the blower module could have a problem providing sufficient cooling air flow throughout the chassis, causing the system to overheat. To prevent a potential overheating problem, you should replace the air filter every 6 months. In certain environments where the air quality is poor, you may have to replace the filter more frequently.

There are two types of air filters used in the Cisco 10008 chassis. Original model chassis use captive screws to hold the filter in a tray, while later model chassis use spring tabs to hold the filter in place without the need for a tray. The following procedures describe how to replace each type of air filter.


Note The following illustrations show the cable management bracket removed for clarity.


Replacing an Air Filter in a Chassis that Uses a Filter Tray

Use the following procedure to remove and replace an air filter in a chassis that uses a filter tray:

Figure 5-5 Loosening the Air Filter Tray Captive Screws

1

Filter tray captive screw

   


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Move any interface cables from the cable brackets on the blower module so they are out of your work area, and then remove the cable brackets from the blower (Figure 5-10).

Step 3 Loosen the captive screws on each side of the blower module and disengage the module (Figure 5-11). Power to the blower will become disconnected.

Step 4 Loosen the captive screws on the air filter tray (Figure 5-5).

Figure 5-6 Removing the Air Filter

Step 5 Pull out the filter tray far enough to remove the air filter (Figure 5-6).

Figure 5-7 Inserting the New Air Filter

Step 6 Place the new air filter in the tray so that you can see the directional arrows located on the metal frame (pointing up) and slide the tray into the chassis (Figure 5-7).

Step 7 Tighten the captive screws to secure the filter to the chassis (Figure 5-7).

Step 8 Slide the blower module back into the chassis making sure it securely connects to the backplane (Figure 5-12). The FANS OK LED should light (green).

Step 9 Tighten the captive screws on each side of the blower module (Figure 5-12).

Step 10 Return all interface cables through the cable management brackets.

Step 11 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Replacing an Air Filter in a Chassis with Release Tabs

Use the following procedure to remove and replace the air filter in a chassis that uses release tabs to hold the filter in place:

Figure 5-8 Air Filter Release Tabs

1

Air filter release tabs

   


Step 1 Press the release tabs out toward each side of the chassis to release the air filter and slide it out of the chassis (Figure 5-8).

Figure 5-9 Inserting the Air Filter

Step 2 Slide the new filter all of the way into the chassis and lift it up until it snaps into place (Figure 5-9).


Note The directional arrows located on the metal frame of the filter should point up (see enlargement in Figure 5-9).


Replacing the Blower Module

Use the following procedure to replace a blower module. The blower module supports hot-swapping (for up to 2 minutes) and can be replaced without interruption to system operation.


Caution To prevent the possibility of the system overheating, be sure that the replacement blower module is out of its box and packaging, so it is ready to install as soon as the defective module is removed.

Figure 5-10 Removing the Cable Brackets


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Move any interface cables from the cable brackets on the blower so they are out of your work area, and then remove the cable brackets from the blower (Figure 5-10).

Figure 5-11 Removing the Blower Module

1

Captive screws

   

Step 3 Loosen the captive screws on each side of the blower module and slide the module out of the chassis (Figure 5-11).

Figure 5-12 Installing the Blower Module

1

Captive screws

   

Step 4 Slide the new blower module into the chassis, being sure it makes a secure connection to the backplane (Figure 5-12).

The FANS OK LED should light (green).

If a FAN FAILURE LED lights (yellow):

Try reseating the blower module.

Remove the rear safety cover and make sure the blower module cable is connected securely (Figure 5-13).

Figure 5-13 Blower Module Cable Connector

1

Blower module connector

   

Step 5 Tighten the captive screws on each side of the blower module (see Figure 5-12).

Step 6 Rerun all interface cables through the cable management brackets.

Step 7 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Installing Power Entry Modules

This section contains the procedures to install or replace AC or DC PEMs.


Note If you are adding a second PEM for redundancy, or if you have redundant PEMs, it is not necessary to shut down the system before replacing a PEM.


Installing a Second DC PEM

Use the following procedure to install a second DC PEM in the bottom power bay for redundancy.


Caution Do not power off the primary DC PEM or all data traffic will halt.

Figure 5-14 Removing the Blank Cover

1

Captive screws

   


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Loosen the captive screws to remove the blank cover from the bottom power bay (Figure 5-14).

Figure 5-15 Installing a DC PEM

1

Captive screws

   

Step 3 Install the new DC PEM all the way into the power bay to ensure a secure connection to the backplane, and tighten the captive screws (Figure 5-15).

Figure 5-16 Loosening the Captive Screw

Step 4 Loosen the captive screw on the rear safety cover and tilt back the cover (Figure 5-16).

Figure 5-17 Removing the Safety Cover

Step 5 Remove the safety cover by lifting it up and out from the chassis (Figure 5-17).

Figure 5-18 DC Power Connection

1

DC terminal block B

   

Step 6 Connect the DC PEM power leads:

Connect the DC power lead from the external power source to the DC terminal block B labeled -48V (Figure 5-18).

Connect the return wire (RTN) to terminal block B labeled RTN (+) (Figure 5-18).

Figure 5-19 Securing DC Power Cables to the Chassis

Step 7 Secure the power cabling to the chassis by feeding a tie wrap through the slot on the side of the chassis and binding the cables (Figure 5-19).

Step 8 Replace the rear safety cover, making sure that the power cables exit through the holes on the side of the cover (Figure 5-19).

Figure 5-20 Setting DC Power Switch to the On Position

Step 9 Set the power switch to the on (|) position (Figure 5-20).

Step 10 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Replacing a DC PEM

Use the following procedure to replace a DC PEM:

Figure 5-21 Setting DC Power Switch to the Off Position


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Set the power switch to the off (0) position. If you have redundant PEMs, set only the power switch of the PEM you are replacing to the off (0) position (the example in Figure 5-21 shows the top PEM in the off position).


Caution Do not power off both of the DC PEMs in a redundant system, or the system shuts and down all data traffic stops. Only power off the DC PEM you are replacing.

Figure 5-22 Removing a DC PEM

1

Captive screw

2

Handle


Step 3 Loosen the captive screws on the DC PEM you are removing and pull the PEM from the chassis using the handle on the faceplate (Figure 5-22).

Figure 5-23 Installing a DC PEM

1

Captive screws

   

Step 4 Install the new DC PEM all the way into the power bay to ensure a secure connection to the backplane, and tighten the captive screws (Figure 5-23).

Figure 5-24 Setting DC Power Switch to the On Position

Step 5 Set the power switch to the on (|) position (Figure 5-24).

Step 6 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Installing a Second AC PEM

Use the following procedure to install a second AC PEM in the bottom power bay for redundancy:

Figure 5-25 Removing the Blank Cover

1

Captive screws

   


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Loosen the captive screws to remove the blank cover from the bottom power bay (Figure 5-25).

Figure 5-26 Installing an AC PEM

1

Captive screws

   

Step 3 Install the new AC PEM all the way into the power bay to ensure a secure connection to the backplane and tighten the captive screws (Figure 5-26).

Step 4 Connect the power cord from the PEM to your power cord that connects to the facility VAC input.

Figure 5-27 AC Power Cord Connectors in Strain Relief Devices

1

Strain relief devices

   

Step 5 Set the AC power cord connectors in strain relief devices to prevent them from accidently disconnecting (Figure 5-27).

Step 6 Plug the facility AC input power cord into a power receptacle.

Figure 5-28 Setting the AC Power Switch to the On Position

Step 7 Set the power switch to the on (|) position (Figure 5-28).

The green LED on the PEM lights indicating that the PEM is on.

Step 8 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Replacing an AC PEM

Use the following procedure to replace an AC PEM:

Figure 5-29 Setting AC Power Switch to the Off Position


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 If your system is configured with redundant PEMs, set only the power switch of the PEM you are replacing to the off (0) position (the example in Figure 5-29 shows the top PEM in the off position).


Caution Do not power off both AC PEMs in a redundant system, or the system shuts down and all data traffic stops. Only power off the AC PEM you are replacing.

Step 3 Remove the PEM power cable from its canoe and disconnect it from the AC input power cable.

Figure 5-30 Removing an AC PEM

1

Captive screw

2

Handle


Step 4 Loosen the captive screws on the PEM you are removing and pull the PEM from the chassis using the handle on the faceplate (Figure 5-30).

Figure 5-31 Installing an AC PEM

1

Captive screws

   

Step 5 Install the new AC PEM all the way into the power bay to ensure a secure connection to the backplane and tighten the captive screws on the PEM (Figure 5-31).

Step 6 Connect the power cord from the PEM to the power cord that connects to the facility VAC input.

Figure 5-32 AC Power Cord Connectors in Canoes

1

Strain relief devices

   

Step 7 Set the AC power cord connectors in a cord strain relief device to prevent them from accidently disconnecting (Figure 5-32).

Step 8 Plug the facility AC input power cord into a power receptacle.

Figure 5-33 Setting AC Power Switch to the On Position

Step 9 Set the power switch to the on (|) position (Figure 5-33).

The green LED on the PEM lights indicating that the PEM is on.

Step 10 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Connecting Alarm Indicators

The Cisco 10008 router provides relay contacts for optional (customer-supplied) audible or visual alarm indicators. Relay contacts are provided for three levels of severity:

Minor—This is an informational alarm and does not affect the system operation.

Major—A condition that affects system operation and should be investigated as soon as possible.

Critical—A condition that affects system operation and requires immediate attention.

Use the following procedure to connect an alarm indicator to the system:

Figure 5-34 Removing the Safety Cover


Step 1 Set the AC or DC PEM power switches to the off (0) position.

Step 2 Loosen the captive screw on the rear safety cover and tilt the cover back (Figure 5-34).

Figure 5-35 Removing the Rear Cover

Step 3 Remove the safety cover by lifting it up and out from the chassis (Figure 5-35).

Figure 5-36 Stripping Insulation

Step 4 Strip not more than 0.4 inches (10 mm) of insulation off of the ends of the alarm indicator wire (Figure 5-36).

Figure 5-37 Alarm Terminal Block Connections

Step 5 Connect one set of alarm indicator wires to the alarm terminal block as follows:

a. Connect one lead to the common (COM) terminal (Figure 5-37).

b. Connect the other lead to the normally closed (NC) or normally open (NO) terminal.


Caution Figure 5-37 shows the wiring configuration for normally open (NO) alarm relays. If you are wiring the router in series with other equipment for the alarm indicators, use the normally closed (NC) terminals. If you are wiring the router in parallel with other equipment for the alarm indicators, use the NO terminals.

Step 6 Repeat steps 1 and 2 for any remaining alarm indicators.

Figure 5-38 Alarm Indicator Wires Exiting Safety Cover

Step 7 Secure the power cabling to the chassis by feeding a tie wrap through the slot on the side of the chassis and binding the cables (see blowout in Figure 5-38).

Step 8 Replace the rear safety cover, making sure that the alarm indicator wires exit through the holes on the side of the cover (Figure 5-38).


Removing and Replacing the PRE

Use the following procedure to install or to remove and replace a PRE module.


Caution Do not operate the system unless all slots contain a line card or a blank faceplate. Blank faceplates are necessary in empty slots to prevent exposure to hazardous voltages, to reduce electromagnetic interference (EMI) that may disrupt other equipment, and to direct the flow of cooling air through the chassis.

Figure 5-39 ESD Chassis Connection

1

ESD socket

   


Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Attach an antistatic wrist strap to your wrist and to the ESD socket on the chassis, or to a bare metal surface on the chassis or frame (Figure 5-39).

If you are removing and replacing a PRE, continue with the next step.

If you are installing a redundant PRE, go to Step 8.

Step 3 Disconnect any interface cables from the PRE if necessary.

Step 4 Remove the PCMCIA card from the PRE (see the "Removing and Installing a PCMCIA Flash Memory Card" section).

Figure 5-40 Loosening the Captive Screws

1

Captive screw

   

Step 5 Unscrew the top and bottom captive screws on the PRE (Figure 5-40).

Figure 5-41 Opening the Ejector Levers

Step 6 Simultaneously pivot both ejector levers away from each other to disengage the PRE from the backplane (Figure 5-41).

Figure 5-42 Removing the PRE

Step 7 Slide the PRE out of the slot and place it on an antistatic surface, or in an antistatic bag (Figure 5-42).

Step 8 Grasp the faceplate of the new PRE with one hand and place your other hand under the card carrier (to support the weight of the module) and position the card in front of the card cage slot.

Figure 5-43 Inserting the PRE

Step 9 Carefully align the upper and lower edges of the PRE with the upper and lower guides in the chassis, and slide the module into the slot until you can feel it begin to seat in the backplane connectors (Figure 5-43).

Figure 5-44 Closing the Ejector Levers

Step 10 Simultaneously pivot both ejector levers toward each other (until they are parallel to the faceplate) to firmly seat the PRE in the backplane (Figure 5-44).

The PRE cycles through its power-on self-test. The Fail LED stays on briefly (about 5 to 6 seconds) and then shuts off. If the Fail LED remains on or is flashing, go to the "Troubleshooting Installation Problems" section.

Figure 5-45 Tightening Captive Screws

1

Captive screw

   

Step 11 Secure the PRE in the chassis by tightening the top and bottom captive screws (Figure 5-45).


Caution Always tighten the captive screws on each newly installed PRE. These screws prevent accidental removal and provide proper grounding for electromagnetic interference (EMI) shielding.

Step 12 Reconnect any interface cables to the PRE if necessary.

Step 13 Install the PCMCIA card in the PRE if necessary (see the "Removing and Installing a PCMCIA Flash Memory Card" section).

Step 14 See the Cisco 10000 Series Router Performance Routing Engine Installation for information about configuring the PRE if necessary.


Note It is not necessary to configure the PRE if this is a second PRE installation for redundancy. The system automatically downloads the necessary configuration information from the primary PRE.


Step 15 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Removing and Installing a PCMCIA Flash Memory Card

Use the following procedure to remove and install a PCMCIA flash memory card:


Note For information about formatting Flash memory cards and disks, see the "Formatting Flash Memory Cards and Disks" section.



Step 1 Remove the front cover if necessary (see Front Cover Procedures).

Step 2 Loosen the captive screw on the PCMCIA flash card cover on the PRE (Figure 5-46).

Figure 5-46 PCMCIA Flash Card Cover Captive Screws

1

Captive screw

   

Figure 5-47 Removing the PCMCIA Flash Card

Step 3 Lift the cover and pull the flash card up and out of its slot (Figure 5-47).

Figure 5-48 Inserting the PCMCIA Flash Card

Step 4 Insert the new PCMCIA flash card into one of the card slots on the PRE (Figure 5-48).


Caution Always tighten the captive screw on the PCMCIA flash card cover to prevent the risk of a harmful ESD event and to ensure electromagnetic interference (EMI) shielding.

Figure 5-49 Tightening the Captive Screw

1

Captive screw

   

Step 5 Close the cover and tighten the captive screw (Figure 5-49).

Step 6 Replace the front cover if necessary (see the "Replacing the Front Cover" section).


Upgrading SDRAM on the PRE

You can increase the amount of SDRAM in your system configuration by replacing the two dual in-line memory modules (DIMMs) with higher capacity SDRAM. The default SDRAM configuration is 128 MB, and can be upgraded to either 256 MB or 512 MB to meet your needs (Table 5-1).


Note We recommend that you upgrade the SDRAM in both the primary and the secondary PRE in a redundant chassis configuration. The DIMMs that you remove may be used in other compatible equipment and should be stored in an antistatic bag.


Table 5-1 Available SDRAM Upgrades

SDRAM Upgrade Options
Cisco Part Number

256 MB SDRAM

ESR-PRE-MEM-256M=

512 MB SDRAM

ESR-PRE-MEM-512M=



Caution To prevent (electrostatic discharge) ESD damage, always wear an ESD-preventive wrist or ankle strap, and handle DIMMs by the edges only. Avoid touching the memory pins or traces (the metal fingers along the connector edge of the DIMM).

The Cisco 10008 router system is hot-swappable, which means you can remove and replace a PRE while the system is operating—if your configuration includes a secondary (redundant) PRE installed in the chassis. The hot-swapping feature allows you to remove or replace a PRE while the system maintains all routing information and ensures session preservation. See the "Removing and Replacing the PRE" section to remove the PRE from the chassis.

Removing and Installing DIMMS

Use the following steps to remove and replace DIMMs in the PRE module


Caution To upgrade SDRAM, you must install identical DIMMs in both DIMM sockets. Do not mix different types of DIMMs.

Figure 5-50 Locating the SDRAM DIMMs

1

DIMM slots

   


Step 1 Remove the PRE according to the instructions in the "Removing and Replacing the PRE" section.

Place the PRE on an antistatic mat or pad so that the DIMMs are facing up (Figure 5-50).

Figure 5-51 Removing the DIMM

1

Ejector tab

   

Step 2 Remove each DIMM from its slot by pushing its ejector tabs out to the side and lifting the DIMM straight up (Figure 5-51).

Figure 5-52 Properly Handling a DIMM

1

Key

   

Step 3 Remove a new DIMM from its antistatic bag (Figure 5-52).


Caution To prevent (electrostatic discharge) ESD damage, always wear an ESD-preventive wrist or ankle strap, and handle DIMMs by the edges only. Avoid touching the memory pins or traces (the metal fingers along the connector edge of the DIMM).

Figure 5-53 Installing a DIMM

1

Ejector tab

   

Step 4 Install each new DIMM by aligning the keys on the DIMM connector over the DIMM slot, and gently pushing the DIMM into the slot until the ejector tabs snap over each end of the DIMM (Figure 5-53).


Caution The DIMMs are keyed and can only be inserted one way. When you insert DIMMs, use firm but not excessive pressure. If you damage a DIMM slot, you must return the PRE to Cisco for repair.

Step 5 Reinstall the PRE in the chassis after both DIMMs are installed.

Troubleshooting the DIMM Installation

If the system fails to boot properly, or if the console terminal displays a checksum error after you install the new DIMMs, check the following:

Each DIMM must be identical in memory size and speed or the system will not operate properly. Do not mix different types of DIMMs.

Ensure that all DIMMs are installed properly by removing the PRE and checking that:

The DIMMs are at the same height and aligned straight up and down

The ejector tabs are snapped over each end of the DIMMs
(see Figure 5-53)

If the system fails to boot properly after you perform these corrective actions, contact the Cisco Technical Assistance Center (TAC) for additional help. Before you contact TAC, make a note of any error messages, unusual LED states, or any other indications that might help the service representative to identify the problem.