Table of Contents

Safety Recommendations

Safety Warnings
Safety with Electricity
Preventing Electrostatic Discharge Damage

Tools and Equipment Needed
Accessing the Mainboard

Removing the Cisco 3620 or 3640 Router Cover
Removing the Cisco 3660 Mainboard Tray

Replacing DRAM and SDRAM

DRAM SIMMs (Used in Cisco 3620 and Cisco 3640 Routers)

DRAM SIMM Orientation
Removing DRAM SIMMS
Installing DRAM SIMMs

SDRAM DIMMs (Used in the Cisco 3660 Router)

SDRAM DIMM Orientation
Removing SDRAM DIMMS
Installing SDRAM DIMMs

Replacing Flash Memory SIMMs

Removing Flash Memory SIMMs
Installing Flash Memory SIMMs

Replacing the ROM
Closing the Router

Replacing the Cover on the Cisco 3620 or 3640 Router
Replacing the Cisco 3660 Mainboard Tray

Replacing Connections to the Router
Testing ROM Installation
Cisco Connection Online
Documentation CD-ROM

Upgrading System Memory in Cisco 3600 Series Routers

Product Numbers:
MEM3600-4FS=, MEM3600-8FS=, MEM3600-16FS=, MEM3600-32FS=
MEM3620-4D=, MEM3620-8D=, MEM3620-16D=
MEM3640-2X4D=, MEM3640-2X8D=, MEM3640-2X16D=, MEM3640-2X32D=
MEM3660-16D=, MEM3660-32D=, MEM3660-64D=, MEM3660-128D=,
BOOT-3600=

This document describes how to upgrade dynamic random-access memory (DRAM) single in-line memory modules (SIMMs), synchronized dynamic random-access memory (SDRAM) dual in-line memory modules (DIMMs), Flash-memory SIMMs, and read-only memory (ROM) in a Cisco 3600 series router.

Use this document in conjunction with the Cisco 3600 Series Hardware Installation Guide and the Regulatory Compliance and Safety Information document for your router. If you have questions or need help, refer to the "Cisco Connection Online" section.

This document contains the following sections:

• Safety Recommendations

• Tools and Equipment Needed

• Accessing the Mainboard

• Replacing DRAM and SDRAM

• Replacing Flash Memory SIMMs

• Replacing the ROM

• Closing the Router

• Replacing Connections to the Router

• Testing ROM Installation

• Cisco Connection Online

• Documentation CD-ROM

Safety Recommendations

Follow these guidelines to ensure general safety:

• Keep the area clear and dust-free during and after installation.

• Keep tools away from walk areas where you or others could fall over them.

• Do not wear loose clothing that could get caught in the chassis. Fasten your tie or scarf and roll up your sleeves.

• Wear safety glasses when working under any conditions that might be hazardous to your eyes.

• Do not perform any action that creates a potential hazard to people or makes equipment unsafe.

Safety Warnings

Safety warnings appear throughout this publication in procedures that, if performed incorrectly, may harm you. A warning symbol precedes each warning statement.

Warning Means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.

Waarschuwing  Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory Compliance and Safety Information (Informatie over naleving van veiligheids- en andere voorschriften) raadplegen dat bij dit toestel is ingesloten.

Varoitus  Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).

Attention  Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions d'avertissements figurant dans cette publication, consultez le document Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.

Warnung  Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das zusammen mit diesem Gerät geliefert wurde.

Avvertenza  Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel documento Regulatory Compliance and Safety Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna questo dispositivo.

Advarsel  Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble levert med denne enheten.

Aviso  Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação, consulte o documento Regulatory Compliance and Safety Information (Informação de Segurança e Disposições Reguladoras) que acompanha este dispositivo.

¡Advertencia!  Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. Para ver una traducción de las advertencias que aparecen en esta publicación, consultar el documento titulado Regulatory Compliance and Safety Information (Información sobre seguridad y conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.

Varning!  Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.

Warning Read the installation instructions before you connect the system to its power source.

Warning Only trained and qualified personnel should be allowed to install or replace this equipment.

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.

Warning Ultimate disposal of this product should be handled according to all national laws and regulations.

Safety with Electricity

Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or connection hardware. Any hardwired connection (other than by a nonremovable, connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers.

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.

Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Both LAN and WAN ports may use RJ-45 connectors. Use caution when connecting cables.

Warning Hazardous network voltages are present in WAN ports regardless of whether power to the router is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the router first.

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

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

Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is OFF and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected.

Follow these guidelines when working on equipment powered by electricity:

• Locate the emergency power-OFF switch in the room in which you are working. Then, if an electrical accident occurs, you can quickly shut the power OFF.

• Before working on the router, turn OFF the power and unplug the power cord.

• Disconnect all power before doing the following:

  • Installing or removing a router chassis

  • Working near power supplies

  • Performing most hardware upgrades

• 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. ESD 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).

Tools and Equipment Needed

You need the following tools and equipment to remove and install SIMMs, DIMMs, or the ROM chip in a Cisco 3600 series router:

• Number 2 Phillips screwdriver

• Small flat-blade screwdriver

• ROM extractor tool

• 32-Pin plastic leaded chip carrier (PLCC) for removing the ROM chip from the Cisco 3660 mainboard

• Needlenose pliers

• ESD-preventive wrist strap

• Antistatic mat

Accessing the Mainboard

This section describes how to open the system in order to access the router's internal components such as memory modules and the ROM. You need a number 2 Phillips or flat-blade screwdriver to complete this procedure.

Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is OFF and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected.

Warning Before performing any of the following procedures, 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.

Removing the Cisco 3620 or 3640 Router Cover

Use the following procedure to remove the cover:

Step 1 Power OFF the router. However, to channel ESD voltages to ground, do not unplug the power cable.

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

Step 2 Remove all network interface cables from the rear panel.

Step 3 Place the router so that the rear panel is facing you. Remove the three screws located on top of the cover near the front edge. (See Figure 1 or Figure 2.) Set the screws aside in a safe place.

Step 4 Lift the front edge of the cover until it clears the front of the chassis. (See Figure 1 or Figure 2.)

Step 5 Pull the cover toward you until the metal tabs on the rear edge separate from the chassis bottom. (See Figure 1 or Figure 2.)

Step 6 Lift the cover until it is free from the chassis and set it aside.

When you are ready to replace the cover, see the "Replacing the Cover on the Cisco 3620 or 3640 Router" section.

Removing the Cisco 3660 Mainboard Tray

Use the following procedure to remove the mainboard tray:

Step 1 Power OFF the router. However, to channel ESD voltages to ground, do not unplug the power cable.

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

Step 2 Remove all network interface cables from the rear panel of the mainboard tray.

Step 3 Place the router so that the rear panel is facing you.

Locate the two sets of screws on the mainboard rear panel: one set of captive screws and one set of Torx screws. (See Figure 3.)

Caution Do not remove or loosen the Torx screws.

Step 4 Loosen the two captive screws located in the upper corners. (See part 1in Figure 3.)

Step 5 Swing the two tray levers out, and slide the mainboard tray out of the chassis. (See parts 2 and 3 in Figure 3.)

Caution The mainboard is an ESD-sensitive component. To avoid damage, observe all ESD precautions.

When you are ready to replace the mainboard tray, see the "Replacing the Cisco 3660 Mainboard Tray" section.

Replacing DRAM and SDRAM

Cisco 3600 series routers use two types of dynamic random access memory (DRAM) described in the following sections:

• DRAM SIMMs (Used in Cisco 3620 and Cisco 3640 Routers)

• SDRAM DIMMs (Used in the Cisco 3660 Router)

DRAM SIMMs (Used in Cisco 3620 and Cisco 3640 Routers)

This section describes how to upgrade DRAM single in-line memory modules (SIMMs) in Cisco 3620 and 3640 routers. You might need to upgrade the DRAM SIMMs for the following reasons:

• You upgraded the Cisco IOS feature set or release and it requires additional DRAM.

• The router maintains large routing tables or other memory-intensive features, such as spoofing or protocol translations.

The Cisco 3620 and 3640 routers each contain four 72-pin SIMM sockets (or banks) for DRAM. Each socket can be filled with a single 32-bit-wide, 72-pin DRAM SIMM. You can configure DRAM as a mixture of primary or main memory, which is reserved for the CPU, and shared memory, which is used for data transmitted or received by modules and WAN interface cards.

Cisco 3640(R4700) processor (revision 0x00) with 24576K/8192K bytes of memory.
 

Only certain combinations of DRAM SIMMs are permitted. These combinations are shown in Table 1 for 32-bit configurations used in Cisco 3620 routers, Table 2 for 32-bit configurations used in Cisco 3640 routers, and Table 3 for 64-bit configurations used in Cisco 3640 routers.

Follow these rules to use 64-bit mode DRAM configuration:

• SIMMs in banks 0 and 1 must be the same size (in MB) and have the same access time (in nanoseconds).

• SIMMs in banks 2 and 3 must also be the same size and have the same access time.

• SIMMs in banks 2 and 3 must be less than or equal to the size of the SIMMs in banks 0 and 1.

Figure 4 or Figure 5 shows the DRAM SIMM locations in your router.

Table 2: 32-Bit DRAM Configuration for Cisco 3640 Routers

Bank 0 (SIMM 0)	Bank 1 (SIMM 1)	Bank 2 (SIMM 2)	Bank 3 (SIMM 3)	Total Memory
4 MB	4 MB	8 MB	-	16 MB
16 MB	-	-	-	16 MB
4 MB	16 MB	-	-	20 MB
8 MB	8 MB	4 MB	-	20 MB
16 MB	4 MB	-	-	20 MB
8 MB	16 MB	-	-	24 MB
8 MB	8 MB	8 MB	-	24 MB
16 MB	8 MB	-	-	24 MB
8 MB	8 MB	4 MB	8 MB	28 MB
8 MB	8 MB	8 MB	4 MB	28 MB
8 MB	8 MB	16 MB	-	32 MB
16 MB	16 MB	4 MB	-	36 MB
16 MB	16 MB	8 MB	-	40 MB
16 MB	16 MB	8 MB	4 MB	44 MB
16 MB	16 MB	4 MB	8 MB	44 MB
16 MB	16 MB	16 MB	4 MB	52 MB
16 MB	16 MB	4 MB	16 MB	52 MB
16 MB	16 MB	16 MB	8 MB	56 MB
16 MB	16 MB	8 MB	16 MB	56 MB

DRAM SIMM Orientation

SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes to ensure proper positioning. Figure 6 shows the polarization notch and alignment holes on a SIMM. DRAM SIMMs are installed with the connector edge down and the polarization notch near the front of the chassis.

Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the underlying mainboard, do not use excessive force when you remove or replace SIMMs.

Removing DRAM SIMMS

Follow these steps to remove DRAM SIMMs:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the connectors.

Step 2 On the mainboard, locate the DRAM SIMM sockets shown in Figure 4 or Figure 5.

Caution Handle SIMMs by the non-connector edges only. SIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 3 Remove one SIMM at a time, beginning with the SIMM in bank 3. To lift the SIMM out of its socket, pull the locking spring clips on both sides outward and tilt the SIMM toward the right side of the chassis, until it is free of the clips. (See Figure 7.)

Step 4 Hold the SIMM by the edges with your thumb and index finger and lift it out of the socket. Place the removed SIMM in an antistatic bag to protect it from ESD damage.

Step 5 Repeat Step 3 and Step 4 for each SIMM.

After you have removed the existing SIMMs, install the new SIMMs as described in the next section "Installing DRAM SIMMs."

Installing DRAM SIMMs

Follow this procedure to install DRAM SIMMs:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the connectors.

Step 2 On the mainboard, locate the DRAM SIMM sockets shown in Figure 4 or Figure 5.

Caution Handle SIMMs by the edges only. SIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 3 Hold the SIMM with the polarization notch on the right, near the front of the chassis, and with the connector edge at the bottom.

Step 4 Beginning with bank 0, insert the SIMM into the socket at an angle, tilted toward the right side of the chassis. Rock the SIMM into a vertical position (see Figure 8), using the minimum amount of force required. When the SIMM is properly seated, the socket guide posts fit through the alignment holes, and the locking spring clips click into place.

Step 5 Ensure that each SIMM is straight (perpendicular to the socket), and that the alignment holes (as shown in Figure 8) line up with the plastic socket guides on the socket.

Caution It is normal to feel some resistance when installing a SIMM, but do not use excessive force on the SIMM, and do not touch the surface components.

Step 6 Repeat Step 3 through Step 5 for each SIMM.

When you finish replacing SIMMs, proceed to the "Replacing the Cover on the Cisco 3620 or 3640 Router" section.

SDRAM DIMMs (Used in the Cisco 3660 Router)

This section describes how to upgrade synchronous dynamic random access memory (SDRAM) dual in-line memory modules (DIMMs) in the Cisco 3660 router. You might need to upgrade the SDRAM DIMMs for the following reasons:

• You upgraded the Cisco IOS feature set or release and it requires additional SDRAM.

• The router maintains large routing tables or other memory-intensive features, such as spoofing or protocol translations.

The Cisco 3660 router contains two 168-pin DIMM sockets (two banks) for SDRAM. Each socket can be filled with a single 64-bit-wide, 168-pin SDRAM DIMM. You can configure SDRAM as a mixture of primary or main memory, which is reserved for the CPU, and shared memory, which is used for data transmitted or received by modules and WAN interface cards.

Cisco 3660(R527x) processor (revision 0x00) with 24576K/8192K bytes of memory.
 

Your router supports both parity and non-parity PC-100 DIMMs ranging in capacity from 16 MB to 128 MB. Only certain combinations of SDRAM DIMMs are permitted. (See Table 4.)

Figure 9 shows the SDRAM DIMM locations in your router.

SDRAM DIMM Orientation

DIMMs are manufactured with polarization notches to ensure proper orientation, and alignment holes to ensure proper positioning. Figure 10 shows the polarization notches and alignment holes on a DIMM. SDRAM DIMMs are installed with the connector edge down and the polarization notches toward the rear of the chassis.

Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the underlying mainboard, do not use excessive force when you remove or replace DIMMs.

Removing SDRAM DIMMS

Follow these steps to remove SDRAM DIMMs:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the connectors.

Step 2 On the mainboard, locate the SDRAM DIMM sockets shown in Figure 9.

Caution Handle DIMMs by the edges only. DIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 3 Remove the DIMM by pushing the locking spring clips on both sides outward (see part 2 in Figure 11). This ejects the DIMM from its socket (see part 1 in Figure 11.)

Step 4 Hold the DIMM by the edges with your thumb and index finger and lift it out of the socket. Place the removed DIMM in an antistatic bag to protect it from ESD damage.

Step 5 If necessary, repeat Step 3 and Step 4 for the other DIMM.

After you have removed the existing DIMMs, install the new DIMMs as described in the next section "Installing SDRAM DIMMs."

Installing SDRAM DIMMs

Follow this procedure to install SDRAM DIMMs:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the connectors.

Step 2 On the mainboard, locate the SDRAM DIMM sockets shown in Figure 9.

Caution Handle DIMMs by the non-connector edges only. DIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 3 Hold the DIMM with the polarization notch on the right, near the rear of the chassis, and with the connector edge at the bottom.

Step 4 Beginning with socket 0, insert the DIMM perpendicular to the socket. Push firmly into place (see part 1 in Figure 11), using the minimum amount of force required. When the DIMM is properly seated, the socket guide posts fit through the alignment holes, and the locking spring clips click into place (see part 2 in Figure 11).

Step 5 Ensure that each DIMM is straight (perpendicular to the socket). (See Figure 11.)

Caution It is normal to feel some resistance when installing a DIMM, but do not use excessive force on the DIMM, and do not touch the surface components.

Step 6 Repeat Step 3 through Step 5 to install a second DIMM.

When you finish replacing DIMMs, and have installed all internal components, proceed to the "Replacing the Cisco 3660 Mainboard Tray" section.

Replacing Flash Memory SIMMs

This section describes how to upgrade the Flash memory SIMMs. The system code (Cisco IOS software) is stored in the Flash memory SIMMs. You might need to replace or add Flash memory SIMMs to upgrade to a new Cisco IOS software feature set.

The router contains one or two 80-pin Flash memory SIMMs. You can upgrade Flash memory by:

Table 5 lists possible Flash memory SIMM configurations and the resulting total Flash memory.

Table 5: Flash Memory SIMM Configurations

Bank 0	Bank 1	Total Memory
4 MB	-	4 MB
4 MB	4 MB	8 MB
4 MB	8 MB	12 MB
4 MB	16 MB	20 MB
8 MB	-	8 MB
8 MB	4 MB	12 MB
8 MB	8 MB	16 MB
8 MB	16 MB	24 MB
16 MB	-	16 MB
16 MB	4 MB	20 MB
16 MB	8 MB	24 MB
16 MB	16 MB	32 MB
32 MB	32 MB	64 MB1

1The 64 MB configuration is available on the Cisco 3660 router only.

Flash memory SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes to ensure proper positioning, similar to that shown in Figure 6. Flash memory SIMMs are installed with the connector edge down and the polarization notch near the front of the chassis.

Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the underlying mainboard, do not use excessive force when you remove or replace SIMMs.

Figure 12 through Figure 14 shows the location of the Flash memory SIMMs on your router's mainboard.

Removing Flash Memory SIMMs

Follow this procedure to remove an existing Flash memory SIMM:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal back plate of the chassis, avoiding contact with the connectors.

Step 2 Locate the Flash memory SIMM sockets on the mainboard. (See Figure 12 through Figure 14.)

Caution Handle SIMMs by the non-connector edges only. SIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 3 To lift the Flash memory SIMM out of its socket, pull the locking spring clips on both sides outward and tilt the SIMM toward the left side of the chassis, free of the clips.
(See Figure 15.)

Installing Flash Memory SIMMs

Follow this procedure to install Flash memory SIMMs:

Step 1 Locate the Flash memory SIMM sockets on the mainboard. (See Figure 12 through Figure 14.)

Caution Handle SIMMs by the non-connector edges only. SIMMs are ESD-sensitive components and can be damaged by mishandling.

Step 2 Hold the SIMM with the polarization notch on the right and the component side away from you, with the connector edge at the bottom.

Step 3 Beginning with bank 0, insert the Flash memory SIMM into its connector slot at an angle, tilted toward the left side of the chassis. (See Figure 16.) Rock the SIMM into a vertical position using the minimum amount of force required. When the SIMM is properly seated, the socket guide posts fit in the alignment holes, and the locking springs click into place.

Caution It is normal to feel some resistance, but do not use excessive force on the SIMM and do not touch the surface components to avoid damaging them.

Step 4 Check the alignment of each SIMM to make sure that it is straight and that the alignment holes are lined up with the plastic socket guides.

When you finish replacing Flash memory SIMMs, and have installed all internal components, proceed to either of these sections:

• "Replacing the Cover on the Cisco 3620 or 3640 Router" section.

• "Replacing the Cisco 3660 Mainboard Tray" section.

Replacing the ROM

To upgrade the router ROM software to a new ROM monitor version, you must replace the existing ROM by following this procedure:

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal backplane of the chassis, avoiding contact with the connectors.

Step 2 Access the mainboard by following the procedures in one of the following:

• "Removing the Cisco 3620 or 3640 Router Cover" section

• "Removing the Cisco 3660 Mainboard Tray" section

Caution Correct placement of the ROM is crucial. If improperly positioned, the new component could be damaged when the router is powered on. Read all instructions before proceeding. To prevent damage to the ROM from ESD (when handling the router and its components), follow the ESD procedures described in the "Preventing Electrostatic Discharge Damage" section. Be careful not to damage or scratch the printed circuit card under the ROM.

Step 3 Locate the ROM on the mainboard. (See Figure 17 through Figure 19.)

If you have a Cisco 3660 router, gently remove the old ROM with a 32-pin PLCC extractor, and set it aside. (See Figure 20.)

Step 5 If you have a Cisco 3620 or Cisco 3640 router, orient and insert the new ROM in its socket (shown in Figure 17 and Figure 18), being careful to not bend or crush any of the bottom pins. To straighten out a bent pin, use needlenose pliers. Align the notch in the new ROM with the notch in the ROM socket, ignoring the orientation of the label.

If you have a Cisco 3660 router, orient and insert the new ROM in its socket (shown in Figure 21), being careful to not bend or crush any of the bottom pins. To straighten out a bent pin, use needlenose pliers. Align the notch in the new ROM with the notch in the ROM socket, ignoring the orientation of the label.

Caution The notch on the ROM must match the notch on the mainboard socket. Installing the ROM backward will damage the ROM, the router, or both.

Closing the Router

Before closing the router, make sure that all cables are securely tucked in, and are not in danger of being stressed or cut.

Replacing the Cover on the Cisco 3620 or 3640 Router

This section describes how to replace the router cover. You need a number 2 Phillips screwdriver to complete this procedure:

Step 2 Hold the cover so the tabs at the rear of the cover are aligned with the chassis bottom. (See Figure 22 or Figure 23.)

Step 5 Fasten the cover with the three screws you set aside in Step 3 of the "Removing the Cisco 3620 or 3640 Router Cover" section.

Step 6 Reinstall the chassis on a rack, wall, or desktop.

Step 7 Proceed to the "Replacing Connections to the Router" section.

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.

Replacing the Cisco 3660 Mainboard Tray

This section describes how to replace the mainboard tray. You need a number 2 Phillips screwdriver to complete this procedure:

Step 2 Hold the tray so that the tabs at the tray's lower corners are aligned with the ledge in the chassis opening. (See part 1 in Figure 24.)

Step 3 Slide the mainboard tray into the chassis until firm contact is made with the backplane. (See part 2 in Figure 24.)

Step 4 Push the levers at the lower corners of the mainboard inward. (See part 3 in Figure 24.)

Step 5 Tighten the two captive screws previously loosened in Step 4 of the "Removing the Cisco 3660 Mainboard Tray" section. (See part 4 in Figure 24.)

Step 6 Reinstall the chassis on a rack or desktop.

Step 7 Proceed to the "Replacing Connections to the Router" section.

Replacing Connections to the Router

Follow these steps to make final connections to the router:

Warning Read the installation instructions before you connect the system to its power source.

Step 1 Replace all network connections.

Step 2 If you have an AC-powered router, plug the power cord into a 3-terminal, single-phase power source that provides power within the acceptable range (100 to 240 VAC, 50 to 60 Hz).

If you have a DC-powered router, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position.

Step 3 Turn ON the power switch. The power LED on the front panel of the router should go ON.)

Step 4 Check the OK LED on the right side of the front panel to verify that it goes ON after a few seconds delay when booting.

Step 5 If you have problems, and you replaced the ROM, see the next section, "Testing ROM Installation." Otherwise, see the "Cisco Connection Online" section.

Testing ROM Installation

If you installed a new ROM, the router should boot into the ROM monitor or Cisco IOS software.

Follow these steps if you suspect that the ROM is inserted incorrectly:

Step 1 Remove the cover or mainboard tray, as described in the section "Accessing the Mainboard" section.

Step 2 Complete the sequence described in the "Replacing the ROM" section.

Step 3 Replace the cover, as described in the section "Closing the Router" section. earlier in this document.

Step 4 Try booting the router again.

If the problem persists, see the next section, "Cisco Connection Online."

Cisco Connection Online

Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.

Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.

CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.

You can access CCO in the following ways:

• WWW:  http://www.cisco.com

• WWW:  http://www-europe.cisco.com

• WWW:  http://www-china.cisco.com

• Telnet:  cco.cisco.com

• Modem:  From North America, 408 526-8070; from Europe, 33 1 64 46 40 82. Use the following terminal settings: VT100 emulation; databits: 8; parity: none; stop bits: 1; and connection rates up to 28.8 kbps.

For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.

Posted: Thu Jul 29 08:25:30 PDT 1999
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