Cisco AS5400XM Universal Gateway Chassis Installation Guide
Replacing Memory Components
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Replacing Memory Components

Table Of Contents

Replacing Memory Components

Removing the Chassis Cover

Required Tools

Safety Recommendations

Chassis Cover Removal

Replacing the Compact Flash

Replacing DIMMs

Required Tools and Equipment

Replacing the DIMM

Replacing the Chassis Cover

Required Tools and Equipment

Chassis Cover Replacement


Replacing Memory Components


This appendix contains procedures on how to replace memory chips in the Cisco AS5400XM universal gateway. The appendix contains the following sections:

Removing the Chassis Cover

Replacing the Compact Flash

Replacing DIMMs

Replacing the Chassis Cover

Removing the Chassis Cover

This section describes how to open the chassis by removing the chassis cover.

Required Tools

You need the following tools:

Medium Phillips screwdriver

Small or medium flat-blade screwdriver

Safety Recommendations

Note the following safety recommendations:


Warning Before opening the unit, disconnect the telephone-network cables to avoid contact with telephone-network voltages. Statement 1041



Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001



Warning Before working on a chassis or working near power supplies, unplug the power cord on AC units; disconnect the power at the circuit breaker on DC units. Statement 12


NVRAM in the universal gateway uses an internal lithium battery to maintain data. Although this is not a field-serviceable component, we are required to provide the following safety warning:


Warning There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions. Statement 1015



Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. Statement 43


Chassis Cover Removal

You must open the chassis to gain access to its interior components: boot read-only memory (ROM) and synchronous dynamic random-access memory dual in-line memory modules (SDRAM DIMMs). When you replace the compact flashs, you must also remove all feature cards in the chassis.

To remove the chassis cover, follow these steps:


Step 1 Turn the power switch off and disconnect site power. (Note that the power switch is part of the power supply.)

Step 2 If using a DC-powered unit, see Figure A-1 and complete Step a through Step d.


Warning Before connecting or disconnecting ground or power wires to the chassis, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position. Statement 140


Figure A-1 DC Power Supply Connections

a. Loosen the six locking screws for the negative, return, and ground connections on the DC power supply terminal blocks.

b. Remove the -48 VDC wires from the terminal block negative connectors (-).

c. Remove the 48 VDC wires from the terminal block positive connectors (+).

d. Remove the safety ground (green wires) from the terminal block ground connectors.

Step 3 Remove all interface cables from the rear panel of the chassis.

Step 4 Place the chassis so that the front panel is facing you.

Step 5 Remove the four screws on the chassis cover. (See Figure A-2.)


Caution Do not connect a 48 VDC wire to the chassis. A single-point ground is recommended at the power distribution rack.

Figure A-2 Removing the Chassis Cover Screws

Step 6 Gently pry the cover off with a flat-blade screwdriver. Lift the chassis cover upward, and pull it away from the tabs on the rear of the chassis. (See Figure A-3.)

Figure A-3 Removing the Chassis Cover


Replacing the Compact Flash

To replace the compact flash, follow these steps:


Step 1 Turn the power switch off and disconnect site power.

For DC-powered units, note the following warnings:


Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003



Warning Before connecting or disconnecting ground or power wires to the chassis, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position. Statement 140



Warning Before opening the unit, disconnect the telephone-network cables to avoid contact with telephone-network voltages. Statement 1041


Step 2 Remove all interface cables from the DFCs.

Step 3 Attach an ESD-preventive wrist strap.

Step 4 Remove the chassis cover. (See the instructions in the "Removing the Chassis Cover" section.)

Step 5 Locate the compact flash on the system board. (See Figure A-4.)

Figure A-4 Memory Locations

1

Backplane connector

2

System board DFC connector

3

AUX

4

CON

5

GE1

6

GE0

7

BITS port

8

Alarm port

9

2T serial interface

10

Compact flash

11

DIMM slot

12

32-bit PCI interface


Step 6 Using your fingers, gently extract the old compact flash and set it on a nonconductive surface. Do not use excessive force, because the socket might break.

Step 7 Insert the new compact flash into the socket. Be careful not to bend or crush any of the bottom pins. If necessary, use needlenose pliers to straighten out any bent pins.

Step 8 Replace the chassis cover. (See the instructions in the "Replacing the Chassis Cover" section.)

Step 9 Power up the universal gateway. If error messages relating to memory are displayed, remove the new compact flash and reinstall it, taking care to seat the compact flash firmly in the socket.


Replacing DIMMs

This section describes how to replace a DIMM on the Cisco AS5400XM universal gateway. The universal gateway has a single DIMM (see Figure A-4). The default factory configuration is a 512 MB double data rate (DDR1) SDRAM DIMM.

You might need to upgrade the DIMM for the following reasons:

You have upgraded to a new Cisco IOS feature set or release that requires more memory.

You are using very large routing tables or many protocols (for example, when the universal gateway is set up as a connection device between large external networks and your internal network).

Required Tools and Equipment

You need the following tools and equipment:

ESD-preventive wrist strap

Appropriate DIMM

Replacing the DIMM

To replace the DIMM, follow these steps:


Step 1 Power down the universal gateway and disconnect site power.

For DC-powered units only, note the following warning.


Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003



Warning Before connecting or disconnecting ground or power wires to the chassis, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position. Statement 140



Warning Before opening the unit, disconnect the telephone-network cables to avoid contact with telephone-network voltages. Statement 1041


Step 2 Remove all interface cables from the DFC cards.

Step 3 Attach an ESD-preventive wrist strap.

Step 4 Remove the chassis cover. (See the instructions in the "Removing the Chassis Cover" section.)

Step 5 Use Figure A-4 to locate the DIMM you are replacing.

Step 6 Pull the socket latches away from the DIMM, and pull the DIMM out of the socket. (See Figure A-5.) The latches hold the DIMM tightly, so be careful not to break the socket.


Caution To prevent damage, do not press on the center of the DIMM. Handle the DIMM carefully.

Figure A-5 Removing the DIMM

Step 7 Position the new DIMM so that the polarization notch is located at the right end of the DIMM socket.

Step 8 Insert the new DIMM by sliding the end with the metal fingers into the DIMM socket. (See Figure A-6.)

Figure A-6 Inserting the New DIMM into the Socket

Step 9 Snap the latches into place. Do not use excessive force, because the socket might break.

Step 10 Replace the chassis cover. (See the "Replacing the Chassis Cover" section.)

Step 11 Power up the universal gateway. If error messages relating to memory are displayed, remove the DIMM and reinstall it, taking care to seat the DIMM firmly in its socket.


Replacing the Chassis Cover

This section describes the procedure for replacing the chassis cover.

Required Tools and Equipment

Medium Phillips screwdriver

Four screws

Cable ties

Chassis Cover Replacement

To replace the chassis cover, follow these steps:


Step 1 Place the chassis bottom so that the front panel is facing you.

Step 2 Hold the chassis cover over the chassis bottom, and align each of the cover tabs with the chassis tabs at the top rear of the chassis, as shown in Figure A-7.

Figure A-7 Replacing the Chassis Cover

Step 3 Lower the front of the top cover to close the chassis, and ensure the following:

The chassis cover tabs fit under the edge of the chassis rear panel so that they are not exposed.

The chassis tabs fit under the chassis cover so that they are not exposed. (See Figure A-8.)

Figure A-8 Cisco AS5400XM Chassis

Step 4 Secure the chassis cover with four screws.

Step 5 Reinstall the chassis on a rack, desktop, or table.

Step 6 Reinstall all interface cables.

Step 7 Reconnect the two AC power cords to the power supply. Or, if using DC power, see Figure A-9, and then complete Step a through Step d.


Warning The illustration shows the DC power supply terminal block. Wire the DC power supply using the appropriate lugs at the wiring end, or with no lugs, as illustrated. The proper wiring sequence is ground to ground, positive to positive, and negative to negative. Note that the ground wire should always be connected first and disconnected last. Statement 197


Figure A-9 DC Power Supply Connections


Caution Do not overtorque the terminal block contact screws. The recommended torque is 5.0 in.-lb (0.56 N-m).

a. Insert the safety ground (green wires) into the terminal block ground connectors and tighten the locking screws. Ensure that no bare wire is exposed.

b. Insert the 48 VDC wires into the terminal block positive connectors (+) and tighten the locking screws. Ensure that no bare wire is exposed.

c. Insert the -48 VDC wires into the terminal block negative connectors (-) and tighten the locking screws. Ensure that no bare wire is exposed.

d. Make sure the power supply cords are secured to the cable strain-relief clamps on the DC power supply with cable ties.


Warning After wiring the DC power supply, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position. Statement 8


Step 8 Power up the universal gateway.

The internal power supply fan should power up.


Caution Do not connect the 48 VDC wire to the chassis. A single-point ground is recommended.