Table Of Contents
Upgrading System Memory in Cisco 3600 Series Routers
Memory Capacities
Memory Configurations
Dynamic Memory
DRAM SIMMs (Cisco 3620 and Cisco 3640 Routers)
SDRAM DIMMs (Cisco 3631 and Cisco 3660 Routers)
Cisco Flash Memory
Safety Recommendations
Safety Warnings
Safety with Electricity
Preventing Electrostatic Discharge Damage
Tools and Equipment Needed
Opening the Router
Removing the Router Cover (Cisco 3620, Cisco 3631, Cisco 3640)
Removing the Mainboard Tray (Cisco 3660)
Replacing DRAM and SDRAM
DRAM SIMMs (Cisco 3620 and Cisco 3640 Routers)
DRAM SIMM Location and Orientation
Removing DRAM SIMMs
Installing DRAM SIMMs
SDRAM DIMMs (Cisco 3631 and Cisco 3660 Routers)
SDRAM DIMM Location and Orientation
Removing SDRAM DIMMs
Installing SDRAM DIMMs
Replacing Cisco Flash Memory SIMMs
Removing Cisco Flash Memory SIMMs
Installing Cisco Flash Memory SIMMs
Replacing ROM
Closing the Router
Replacing the Cover (Cisco 3620, Cisco 3631, Cisco 3640)
Replacing the Mainboard Tray (Cisco 3660)
Replacing Connections to the Router
Testing ROM Installation
Recovering Cisco Flash Memory and System Images
Using the xmodem Command
Obtaining Documentation
World Wide Web
Documentation CD-ROM
Ordering Documentation
Documentation Feedback
Obtaining Technical Assistance
Cisco.com
Technical Assistance Center
Cisco TAC Website
Cisco TAC Escalation Center
Upgrading System Memory in Cisco 3600 Series Routers
Product Numbers:
MEM3600-4FS=, MEM3600-8FS=, MEM3600-16FS=, MEM3600-32FS=, MEM3620-4D=, MEM3620-8D=, MEM3620-16D=, MEM3631-32CF-INCL, MEM3631-32U64CF, MEM3631-32U128CF, MEM3631-64CF=, MEM3631-128CF=, MEM3631-64D-INCL, MEM3631-64U128D, MEM3631-64U192D, MEM3631-64U256D, MEM3631-64D=, MEM3631-128D=, MEM3640-2X4D=, MEM3640-2X8D=, MEM3640-2X16D=, MEM3640-2X32D=, MEM3660-16D=, MEM3660-32D=, MEM3660-64D=, MEM3660-128D=, BOOT-3600=
This document describes how to upgrade the following in a Cisco 3600 series router:
•
Dynamic random-access memory (DRAM) single in-line memory modules (SIMMs)
•Synchronized dynamic random-access memory (SDRAM) dual in-line memory modules (DIMMs)
•Cisco Flash memory SIMMs
•Read-only memory (ROM)
Note In this document, the term "Cisco 3600 series" represents the following router models: Cisco 3620 router, Cisco 3631 router, Cisco 3640 router, and Cisco 3660 router.
Use this document in conjunction with the following:
•Cisco 3600 Series Hardware Installation Guide and the Regulatory Compliance and Safety Information document for your router, both available online at
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_inst/
•Installing and Configuring Cisco Flash Memory Cards in Cisco 3600 Series Routers, available online at
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_inst/hw_notes/index.htm
If you have questions or need help, see the "Obtaining Documentation" section and the "Obtaining Technical Assistance" section for further information.
This document contains the following sections:
•Memory Capacities
•Memory Configurations
•Safety Recommendations
•Tools and Equipment Needed
•Opening the Router
•Replacing DRAM and SDRAM
•Replacing Cisco Flash Memory SIMMs
•Replacing ROM
•Closing the Router
•Replacing Connections to the Router
•Testing ROM Installation
•Recovering Cisco Flash Memory and System Images
•Obtaining Documentation
•Obtaining Technical Assistance
Memory Capacities
This document describes how to upgrade both dynamic memory and Cisco Flash memory. You might need to upgrade memory for the following reasons:
•To upgrade to a new Cisco IOS feature set or release that requires additional memory. (Memory requirements for each feature set and release are available in the release notes for that release.)
•To use very large routing tables, many protocols (as may be required, for example, when the router is part of both a large external network and your internal network), or other memory-intensive features such as spoofing or protocol translations.
Cisco 3600 series routers use two types of dynamic memory:
•DRAM SIMMs (Cisco 3620 and Cisco 3640 routers)
•SDRAM DIMMs (Cisco 3631 and Cisco 3660 routers)
Note SIMMs and DIMMs are not interchangeable.
Memory capacities are shown in Table 1.
Table 1 Memory Capacities for Cisco 3600 Series Routers
Router
|
DRAM
|
Cisco Flash Memory
|
Cisco 3620
|
32- to 64-MB DRAM SIMMs
|
8- to 32-MB SIMM
|
Cisco 3631
|
64- to 256-MB SDRAM DIMMs
|
32- to 128-MB Flash memory card
|
Cisco 3640
|
32- to 128-MB DRAM SIMMs
|
8- to 32-MB SIMM
|
Cisco 3660
|
32- to 256-MB SDRAM DIMMs
|
8- to 64-MB SIMM
|
Memory Configurations
For information on configuring dynamic (DRAM and SDRAM) and Cisco Flash memory, see the following sections.
Dynamic Memory
You can configure DRAM or SDRAM as a mixture of primary or main memory that is reserved for the CPU and shared memory that is used for data transmitted or received by modules and WAN interface cards.
To examine current dynamic memory status or reconfigure memory allocation, do the following as appropriate:
Step 1 To see how much memory is currently installed in your router, enter the show version command in EXEC mode. Near the middle of the resulting output, locate a message similar to the following:
Cisco XXXX processor (revision X) with 24576K/8192K bytes of memory.
This line shows how much memory is installed (in this example, 24576K/8192K). The first number represents primary memory; the second number represents shared memory.
Step 2 To configure the proportion of DRAM or SDRAM devoted to main memory and to shared memory, enter the memory-size iomem command in global configuration mode.
Note For information about these and related commands, refer to the Cisco IOS configuration guides and command references. See the "Obtaining Documentation" section for information about these publications.
DRAM SIMMs (Cisco 3620 and Cisco 3640 Routers)
Cisco 3620 and Cisco 3640 routers each contain four SIMM sockets for DRAM: bank 0 (SIMM 0), bank 1 (SIMM 1), bank 2 (SIMM 2), and bank 3 (SIMM 3). A socket corresponds to one bank of memory. Each socket can hold one DRAM SIMM of any size permitted for that router.
Banks must be filled consecutively with no gaps. Start filling from bank 0, and start emptying from bank 3. Bank 0 must always be filled first and emptied last.
DRAM supports 32-bit and 64-bit operation as follows:
•Cisco 3620: Supports 32-bit operation only.
•Cisco 3640: Supports either 32- or 64-bit operation. Router performance is approximately 20 percent slower in 32-bit mode than in 64-bit mode. To use 64-bit mode, you must install DRAM SIMMs in pairs of the same size. Generally, basic software feature sets (such as IP) use 32-bit DRAM SIMMs and robust software feature sets (such as Enterprise) use 64-bit DRAM SIMMs.
Follow these rules to use 64-bit operation:
•SIMMs in banks 0 and 1 must:
–Be the same size (in megabytes)
–Have the same access time (in nanoseconds).
•SIMMs in banks 2 and 3 must:
–Be the same size (in megabytes), and the same size as or smaller than those in banks 0 and 1
–Have the same access time (in nanoseconds)
Thus, only certain combinations of DRAM SIMMs are permitted:
•Combinations for 32-bit configurations used in Cisco 3620 routers are shown in Table 2.
•Combinations for 32-bit configurations used in Cisco 3640 routers are shown in Table 3.
•Combinations for 64-bit configurations used in Cisco 3640 routers are shown in Table 4.
Table 2 32-Bit DRAM Configuration for Cisco 3620 Routers
Bank 0 (SIMM 0)
|
Bank 1 (SIMM 1)
|
Bank 2 (SIMM 2)
|
Bank 3 (SIMM 3)
|
Total Memory
|
4 MB
|
4 MB
|
4 MB
|
4 MB
|
16 MB
|
4 MB
|
4 MB
|
8 MB
|
—
|
8 MB
|
8 MB
|
—
|
—
|
16 MB
|
—
|
—
|
—
|
4 MB
|
4 MB
|
4 MB
|
4 MB
|
4 MB
|
16 MB
|
—
|
—
|
20 MB
|
8 MB
|
8 MB
|
4 MB
|
—
|
16 MB
|
4 MB
|
—
|
—
|
8 MB
|
16 MB
|
—
|
—
|
24 MB
|
8 MB
|
8 MB
|
8 MB
|
—
|
8 MB
|
8 MB
|
4 MB
|
4 MB
|
16 MB
|
8 MB
|
—
|
—
|
8 MB
|
8 MB
|
4 MB
|
8 MB
|
28 MB
|
8 MB
|
8 MB
|
8 MB
|
4 MB
|
8 MB
|
8 MB
|
16 MB
|
-
|
32 MB
|
8 MB
|
8 MB
|
8 MB
|
8 MB
|
16 MB
|
16 MB
|
—
|
—
|
16 MB
|
16 MB
|
4 MB
|
—
|
36 MB
|
16 MB
|
16 MB
|
4 MB
|
4 MB
|
40 MB
|
16 MB
|
16 MB
|
8 MB
|
—
|
16 MB
|
16 MB
|
4 MB
|
8 MB
|
44 MB
|
16 MB
|
16 MB
|
8 MB
|
4 MB
|
16 MB
|
16 MB
|
8 MB
|
8 MB
|
48 MB
|
16 MB
|
16 MB
|
16 MB
|
—
|
16 MB
|
16 MB
|
16 MB
|
4 MB
|
52 MB
|
16 MB
|
16 MB
|
16 MB
|
8 MB
|
56 MB
|
16 MB
|
16 MB
|
16 MB
|
16 MB
|
64 MB
|
Table 3 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
|
—
|
—
|
—
|
4 MB
|
16 MB
|
—
|
—
|
20 MB
|
8 MB
|
8 MB
|
4 MB
|
—
|
16 MB
|
4 MB
|
—
|
—
|
8 MB
|
16 MB
|
—
|
—
|
24 MB
|
8 MB
|
8 MB
|
8 MB
|
—
|
16 MB
|
8 MB
|
—
|
—
|
8 MB
|
8 MB
|
4 MB
|
8 MB
|
28 MB
|
8 MB
|
8 MB
|
8 MB
|
4 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
|
16 MB
|
16 MB
|
16 MB
|
4 MB
|
52 MB
|
16 MB
|
16 MB
|
4 MB
|
16 MB
|
16 MB
|
16 MB
|
16 MB
|
8 MB
|
56 MB
|
16 MB
|
16 MB
|
8 MB
|
16 MB
|
Table 4 64-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
|
4 MB
|
4 MB
|
16 MB
|
8 MB1
|
8 MB
|
—
|
—
|
8 MB-Dual2
|
8 MB-dual
|
—
|
—
|
8 MB
|
8 MB
|
4 MB
|
4 MB
|
24 MB
|
8 MB-Dual
|
8 MB-dual
|
4 MB
|
4 MB
|
8 MB
|
8 MB
|
8 MB
|
8 MB
|
32 MB
|
8 MB
|
8 MB
|
8 MB-dual
|
8 MB-dual
|
8 MB-Dual
|
8 MB-dual
|
8 MB
|
8 MB
|
8 MB-Dual
|
8 MB-dual
|
8 MB-dual
|
8 MB-dual
|
16 MB
|
16 MB
|
—
|
—
|
16 MB
|
16 MB
|
4 MB
|
4 MB
|
40 MB
|
16 MB
|
16 MB
|
8 MB
|
8 MB
|
48 MB
|
16 MB
|
16 MB
|
8 MB-dual
|
8 MB-dual
|
16 MB
|
16 MB
|
16 MB
|
16 MB
|
64 MB
|
32 MB-Dual3
|
32 MB-Dual
|
—
|
—
|
32 MB-Dual
|
32 MB-Dual
|
4 MB
|
4 MB
|
72 MB
|
32 MB-Dual
|
32 MB-Dual
|
8 MB
|
8 MB
|
80 MB
|
32 MB-Dual
|
32 MB-Dual
|
8 MB-Dual
|
8 MB-Dual
|
32 MB-Dual
|
32 MB-Dual
|
16 MB
|
16 MB
|
96 MB
|
32 MB-Dual
|
32 MB-Dual
|
32 MB-Dual
|
32 MB-Dual
|
128 MB
|
SDRAM DIMMs (Cisco 3631 and Cisco 3660 Routers)
Cisco 3631 and Cisco 3660 routers each contain two DIMM sockets for SDRAM: bank 0 (DIMM 0) and bank 1 (DIMM 1). A socket corresponds to one bank of memory. Each socket can hold one SDRAM DIMM of any size permitted for that router. The other socket can optionally be left empty.
Banks must be filled in the following order:
•Cisco 3631: Fill in any order.
•Cisco 3660: Fill from bank 0, and empty from bank 1. Bank 0 must always be filled first and emptied last.
DIMM parity is as follows:
•Cisco 3631: Nonparity DIMMs
•Cisco 3660: Both parity and nonparity DIMMs
Note An advantage to using parity DIMMs compared to nonparity DIMMs is easier identification of memory errors. A disadvantage is lower performance.
Only certain combinations of SDRAM DIMM sizes are permitted:
•Cisco 3631: There is no limitation on the relative size of DIMMs in bank 1 and bank 0, as shown in Table 5.
•Cisco 3660: The DIMM in bank 1 must be the same size as or smaller than the DIMM in bank 0, as shown in Table 6.
Table 5 SDRAM Configurations for Cisco 3631 Routers
Bank 0 (DIMM 0)
|
Bank 1 (DIMM 1)
|
Total Memory
|
—
|
64 MB
|
64 MB
|
64 MB
|
—
|
—
|
—
|
—
|
64 MB
|
96 MB
|
64 MB
|
—
|
128 MB
|
—
|
128 MB
|
64 MB
|
64 MB
|
—
|
128 MB
|
—
|
128 MB
|
160 MB
|
128 MB
|
—
|
64 MB
|
128 MB
|
192 MB
|
128 MB
|
64 MB
|
128 MB
|
128 MB
|
256 MB
|
Table 6 SDRAM Configurations for Cisco 3660 Routers
Bank 0 (DIMM 0)
|
Bank 1 (DIMM 1)
|
Total Memory
|
2Mx64
|
2Mx64
|
32 MB
|
4Mx64
|
—
|
4Mx64
|
2Mx64
|
48 MB
|
4Mx64
|
4Mx64
|
64 MB
|
8Mx64
|
—
|
8Mx64
|
2Mx64
|
80 MB
|
8Mx64
|
4Mx64
|
96 MB
|
8Mx64
|
8Mx64
|
128 MB
|
16Mx64
|
—
|
16Mx64
|
2Mx64
|
144 MB
|
16Mx64
|
4Mx64
|
160 MB
|
16Mx64
|
8Mx64
|
192 MB
|
16Mx64
|
16Mx64
|
256 MB
|
Cisco Flash Memory
Cisco IOS software on Cisco 3600 routers is stored as follows:
•Cisco 3631: In an internal compact Cisco Flash memory card. Memory cards come with 32-, 64-, or 128-MB of memory.
•Cisco 3620, Cisco 3640, and Cisco 3660: In one or two Cisco Flash memory SIMMs.
To examine current Cisco Flash memory status, do the following:
Step 1 To see how much Cisco Flash memory is currently installed in your router, enter the show flash command in EXEC mode.
You can upgrade Cisco Flash memory by doing either or both of the following:
•Cisco 3631: Replace the existing card with one of greater capacity.
Note For instructions on how to install a Cisco Flash memory card, refer to documentation on installing and configuring or formatting Cisco Flash memory, available online at
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_inst/hw_notes/index.htm
•Cisco 3620, Cisco 3640, and Cisco 3660: Do either or both of the following:
–Replace the existing (typically 4-MB) SIMM with one of greater capacity.
–Add a SIMM to the second Cisco Flash memory socket.
Each Cisco Flash memory SIMM socket corresponds to one bank of memory. Fill starting with bank 0, and empty starting with bank 1. Bank 0 must always be filled first and emptied last.
Specifics for the Cisco 3620, Cisco 3640, and Cisco 3660 routers are listed in the following table and discussed below.
| |
Upgrade Strategy
|
Cisco 3620, Cisco 3640
|
Cisco 3660
|
Step 1
|
Replace existing SIMM with...
|
8- or 16-MB SIMM
|
8-, 16-, or 32-MB SIMM
|
Step 2
|
Add a SIMM to the second Cisco Flash memory socket
|
|
|
| |
To a total of...
|
32 MB
|
64 MB
|
Note Cisco Flash memory SIMMs are not interchangeable with DRAM SIMMs or SDRAM DIMMs.
Table 7 lists possible Cisco Flash memory SIMM configurations and the resulting total Cisco Flash memory.
Table 7 Cisco Flash Memory SIMM Configurations
Router
|
Bank 0
|
Bank 1
|
Total Memory
|
All
|
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
|
Cisco 3660
|
32 MB
|
32 MB
|
64 MB
|
Safety Recommendations
Follow these guidelines to ensure general safety:
•Keep the chassis area clear and dust-free during and after installation.
•Place the removed chassis cover in a safe place.
•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.
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Varoitus
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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).
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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.
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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.
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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.
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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.
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Aviso
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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.
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¡Advertencia!
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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.
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Varning!
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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.
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Warning Read the installation instructions before you connect the system to its power source. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Warning Only trained and qualified personnel should be allowed to install or replace this equipment. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Warning Ultimate disposal of this product should be handled according to all national laws and regulations. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Safety with Electricity
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Warning The Ethernet 10BaseT, serial, console, and auxiliary ports contain safety extra-low voltage (SELV) circuits. BRI circuits are treated like telephone-network voltage (TNV) circuits. Avoid connecting SELV circuits to TNV circuits. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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 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, you must use the wrist strap and cord 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. It 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.
Tools and Equipment Needed
You need the following tools and equipment to remove and install SIMMs, DIMMs, or the ROM in a Cisco 3600 series router:
•Number 2 Phillips screwdriver
•Small flat-blade screwdriver
•ROM extraction tool
•32-pin plastic leaded chip carrier (PLCC) for removing the ROM chip from the mainboard
•Needlenose pliers
•ESD-preventive wrist strap
•Antistatic mat
Opening the Router
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Proceed to the section that pertains to your router:
•Removing the Router Cover (Cisco 3620, Cisco 3631, Cisco 3640)
•Removing the Mainboard Tray (Cisco 3660)
Removing the Router Cover (Cisco 3620, Cisco 3631, Cisco 3640)
Follow these steps to remove the router cover:
Step 1 Locate the appropriate figure for your Cisco router so that you can refer to it in the following steps. (See Figure 1, Figure 2, or Figure 3.)
Figure 1 Removing the Cisco 3620 Router Cover
Figure 2 Removing the Cisco 3631 Router Cover
Figure 3 Removing the Cisco 3640 Router Cover
Step 2 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 3 Turn OFF the power and unplug the power cord.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Step 4 Disconnect all network-interface cables from the rear panel.
Step 5 Place the chassis so that the rear panel faces you.
Step 6 Remove the screws located on top of the cover near the front edge. Set the screws aside in a safe place.
Step 7 Lift the front edge of the cover up to a 45-degree angle so that it clears the front of the chassis.
Step 8 Slide the cover toward you or away from the fans until the tabs are free from the slots.
Step 9 When you are ready to replace the cover, see the "Replacing the Cover (Cisco 3620, Cisco 3631, Cisco 3640)" section.
Removing the Mainboard Tray (Cisco 3660)
Follow these steps 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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Step 2 Remove all network interface cables from the rear panel of the mainboard tray.
Step 3 Place the chassis so that the rear panel faces you.
Step 4 Locate the two sets of screws on the mainboard rear panel: one set of captive screws and one set of Torx screws.
Caution Do not remove or loosen the Torx screws.
Step 5 Loosen the two captive screws located in the upper corners. (See Figure 4 part 1.)
Step 6 Swing the two tray levers out, and slide the mainboard tray out of the chassis. (See Figure 4 parts 2 and 3.)
Figure 4 Removing the Cisco 3660 Mainboard Tray
Caution The mainboard is an ESD-sensitive component. To avoid damage, observe all ESD precautions.
Step 7 When you are ready to replace the mainboard tray, see the "Replacing the Mainboard Tray (Cisco 3660)" section.
Replacing DRAM and SDRAM
DRAM SIMMs (Cisco 3620 and Cisco 3640 Routers)
DRAM SIMM Location and Orientation
Figure 5 or Figure 6 shows the DRAM SIMM locations in your router.
Figure 5 DRAM SIMM Locations in the Cisco 3620 Router
Figure 6 DRAM SIMM Locations in the Cisco 3640 Router
SIMMs are manufactured with a polarization notch to ensure proper orientation and alignment holes to ensure proper positioning. Figure 7 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.
Figure 7 DRAM SIMM
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. (See Figure 5 or Figure 6.)
Caution Handle the SIMM by the nonconnector edges only; do not press on the center. Handle carefully. 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 8.)
Figure 8 Removing DRAM SIMMs
Step 4 Hold the SIMM by the edges with your thumb and index finger and lift it out of the socket. Place it in an antistatic bag to protect it from ESD damage.
Step 5 Repeat Step 3 and Step 4 for each SIMM.
Step 6 Install the new SIMMs as described in the next section "Installing DRAM SIMMs."
Installing DRAM SIMMs
Follow these steps 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. (See Figure 5 or Figure 6.)
Caution Handle the SIMM by the nonconnector edges only; do not press on the center. Handle carefully. 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 9) using the minimum amount of force required. When the SIMM is properly seated, the socket guideposts fit through the alignment holes, and the locking spring clips click into place.
Figure 9 Installing DRAM SIMMs
Step 5 Ensure that each SIMM is straight (perpendicular to the socket), and that the alignment holes (see Figure 9) 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.
Step 7 Proceed to the "Replacing the Cover (Cisco 3620, Cisco 3631, Cisco 3640)" section.
SDRAM DIMMs (Cisco 3631 and Cisco 3660 Routers)
SDRAM DIMM Location and Orientation
Figure 10 or Figure 11 shows the SDRAM DIMM locations in your router.
Figure 10 SDRAM DIMM Locations in the Cisco 3631 Router
Figure 11 SDRAM DIMM Locations in the Cisco 3660 Router
DIMMs are manufactured with polarization notches to ensure proper orientation, and alignment holes to ensure proper positioning. Figure 12 and Figure 13 show the polarization notches and alignment holes on a DIMM. SDRAM DIMMs are installed with the connector edge down and the polarization notches as follows:
•Cisco 3631: Toward the left side of the chassis
•Cisco 3660: 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.
Figure 12 SDRAM DIMM Orientation in the Cisco 3631 Router
Figure 13 SDRAM DIMM Orientation in the Cisco 3660 Router
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. (See Figure 10 or Figure 11.)
Caution Handle the DIMM by the nonconnector edges only; do not press on the center. Handle carefully. 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. This ejects the DIMM from its socket. (See Figure 14.)
Figure 14 Removing and Installing SDRAM DIMMs
Step 4 Hold the DIMM by the edges with your thumb and index finger and lift it out of the socket. Place it in an antistatic bag to protect it from ESD damage.
Step 5 If necessary, repeat Step 3 and Step 4 for the other DIMM.
Step 6 Install the new DIMMs as described in the "Installing SDRAM DIMMs" section.
