Memory Replacement Instructions for the Network Processing Engine or Network Services Engine and Input/Output Controller - Preparing for Installation [Cisco 7200 Series Routers]

Table Of Contents

Preparing for Installation

Parts and Tools

Software and Hardware Requirements

Upgrading the Boot Helper Image

Safety Guidelines

Safety Warnings

Electrical Equipment Guidelines

Telephone Wiring Guidelines

Electrostatic Discharge Prevention

Ensuring Easy Access to the Router

Preparing for Installation

This chapter provides hardware and software requirements, and a list of parts and tools you need to remove main memory DRAM and SDRAM modules and PC (Flash memory) cards, or Flash Disks or CompactFlash Disks from Cisco 7200 series routers and Cisco uBR7200 series routers. This chapter also includes safety and ESD-prevention guidelines to help you avoid injury to yourself and damage to the equipment.

Parts and Tools

You need the following tools and parts to replace the main memory modules in the network processing engine or network services engine, PC cards or Flash Disks in the I/O controller, and CompactFlash Disks in the NPE-G1 or NPE-G2:

•New DRAM SIMMs, SDRAM DIMMs, SDRAM SODIMM, CompactFlash Disks, Flash Disks, or PC cards

Note For information on replacing the Compact Flash Disk in the NPE-G1 or NPE-G2, or UBR7200-NPE-G1 or UBR7200-NPE-G2, refer to the Using the Flash Disk document online at: http://www.cisco.com/en/US/products/hw/routers/ps341/prod_installation_guide09186a00802a6394.html

•Number 2 Phillips and a 3/16-inch flat-blade screwdriver

•8-mm wrench or nut driver, or adjustable wrench (for connecting a grounding lug to a Cisco uBR7200 series DC-input power supply)

•7-mm wrench or nut driver, or adjustable wrench (for connecting the DC-input power lead strain-relief cover to a DC-input power supply)

•Tape (for securing the switch handle of a DC circuit breaker in the off position)

•Your own ESD-prevention equipment or the disposable grounding wrist strap included with all upgrade kits, field-replaceable units (FRUs), and spares

•Antistatic mat or surface, or static shielding bag

If you need additional equipment, contact a service representative for ordering information.

Software and Hardware Requirements

Some network processing engines and the network services engine are compatible only with certain chassis. See Table 3-1.

Table 3-1 Routers and Supported NPEs or NSE

Router

NPE or NSE

Cisco 7200 routers

NPE-100, NPE-150, NPE-175, NPE-200, and NPE-225

Cisco 7200 VXR routers

All NPEs and the NSE-1

Cisco 7206 as a router shelf in a Cisco AS5800 Universal Access Server

NPE-200

Cisco 7206VXR as a router shelf in a Cisco AS5800 Universal Access Server

NPE-300 and the NPE-400

Cisco uBR7246VXR universal broadband router¹

NPE-225, NPE-300, NPE-400, UBR7200-NPE-G1, and UBR7200-NPE-G2

Cisco uBR7246 universal broadband router

NPE-150, NPE-200, and NPE-225

Cisco uBR7223 universal broadband router

NPE-150, NPE-200, and NPE-225

¹Previous documents stated that the NPE-175 was also supported on the Cisco uBR7200 series routers. Because the NPE-175 has reached its end of life and was never made orderable on the Cisco uBR7200 series routers, it is shown as no longer supported for Cisco uBR7200 series routers.

Note The NPE-300, NPE-400, NSE-1, NPE-G1, and the NPE-G2 are compatible with the Cisco 7200 VXR routers. The NPE-300, NPE-400, UBR7200-NPE-G1 and the UBR7200-NPE-G2 are compatible with the Cisco 7246VXR router. They cannot be used in the Cisco 7200 series routers (Cisco 7202, Cisco 7204, and Cisco 7206) and the Cisco uBR7246.

Note The NPE-100, NPE-150, NPE-175, NPE-200, and NPE-300 have reached their end-of-life and are no longer sold, although they are still supported in existing installations. For information about each processor's end-of-life cycle, see the Product Bulletins at the following URL:
http://www.cisco.com/en/US/products/hw/routers/ps341/prod_bulletins_list.html.

We recommend that your boot helper image correspond to the minimum software release required for your platform. To upgrade your boot helper image, see the "Upgrading the Boot Helper Image" section.

The following tables list the recommended minimum Cisco IOS software release required to use the network processing engine or network services engine in supported router platforms:

•Table 3-2 lists the software requirements for the NPE-G2 and NPE-G1.

•Table 3-3 lists the software requirements for the NSE-1, NPE-400, and NPE-300.

•Table 3-4 lists the software requirements for the NPE-225 and NPE-175.

•Table 3-5 lists the software requirements for the NPE-200, NPE-150, and NPE-100.

Table 3-2 Software Requirements for the NPE-G2 and NPE-G1

Router Platform

NPE

NPE-G2/UBR7200-NPE-G2

NPE-G1/ UBR7200-NPE-G1

Cisco 7200 series

Cisco IOS Release 12.4(4)XD or later releases of 12.4XD

Cisco IOS Release 12.2(4)BW or later releases of 12.2B

Cisco IOS Release 12.1(14)E or later releases of 12.1E

•Cisco 7204VXR and Cisco 7206VXR

•Cisco 7204 and Cisco 7206

—

—

•Cisco 7202

—

—

Cisco AS5800 Universal Access Server¹

—

—

•Cisco 7206VXR router shelf

•Cisco 7206 router shelf

—

—

Cisco uBR7200 series

Cisco IOS Release 12.2(11)CX with a special boot helper image of 12.2(11)CX

•Cisco uBR7246 VXR

Cisco IOS Release 12.2(33)SCA or later releases of 12.2SC

•Cisco uBR7246

—

—

¹For information about the Cisco 7206 or 7206VXR as router shelves in the Cisco AS5800 Universal Access Server, refer to the Cisco AS5800 Universal Access Server documentation listed on Cisco.com.

Table 3-3 Software Requirements for the NSE-1, NPE-400, and NPE-300

Router Platform

NPE or NSE

NSE-1

NPE-400

NPE-300

Cisco 7200 series

Cisco IOS Release 12.1E or Cisco IOS Release 12.1(5)T or later releases of 12.1T

Cisco IOS Release 12.1(3a)E or later releases 12.1E

Cisco IOS
Release 12.1(5)T or later releases of 12.1T

Cisco IOS
Release 12.0(14)S or later releases of 12.0S

•Cisco 7204VXR and Cisco 7206VXR

Cisco IOS Release 12.0(2)XE2 or later releases of 12.0 XE
Cisco IOS Release 12.0(3)T or later releases of 12.0T¹

•Cisco 7204 and Cisco 7206

—

—

—

•Cisco 7202

—

—

—

Cisco AS5800 Universal Access Server²

—

Cisco IOS Release 12.1(6)EC or later releases of 12.1EC with a special boot helper image of 12.0(15)SC [ubr7200-boot-mz.120-15.SC]

Cisco IOS Release 12.0(4)XJ or later releases of 12.0 XJ

•Cisco 7206VXR router shelf

•Cisco 7206 router shelf

—

—

—

Cisco uBR7200 series

—

Cisco IOS Release 12.1(6)EC or later releases of 12.1 EC with a special boot helper image of 12.0(15)SC [ubr7200-boot-mz.120-15.SC]

Cisco IOS Release 12.2(4)BC1 or later releases of 12.2 BC

Cisco IOS Release 12.0(6)SC or later releases of 12.0SC

Cisco IOS Release 12.1(3a)EC1 or later releases of 12.1EC³

Cisco IOS Release 12.2(4)BC1 or later releases of 12.2BC

•Cisco uBR7246 VXR

•Cisco uBR7246

—

—

—

¹Cisco IOS Release 12.1(5)T and later releases of 12.1 T require a minimum of 12 MB of SRAM or SDRAM.

²For information about the Cisco 7206 or 7206VXR as router shelves in the Cisco AS5800 Universal Access Server, refer to the Cisco AS5800 Universal Access Server documentation on Cisco.com.

³Cisco IOS Release 12.1(8)EC or later is required to use the MEM-SD-NSE-256MB memory module in the NPE-300.

Table 3-4 Software Requirements for the NPE-225 and NPE-175

Router Platform

NPE-225¹

NPE-175

Cisco 7200 series

Cisco IOS Release 12.0(4)XE or later releases of 12.0XE

Cisco IOS Release 12.0(5)T or later releases of 12.0T

•Cisco 7204VXR and Cisco 7206VXR

•Cisco 7204 and Cisco 7206

Cisco IOS Release 12.0(4)XE or later releases of 12.0XE

Cisco IOS Release 12.0(5)T or later releases of 12.0T

•Cisco 7202

—

—

Cisco uBR7200 series²

•Cisco uBR7246 VXR

Cisco IOS Release 12.0(6)SC or later releases of 12.0SC

Cisco IOS Release 12.1(3a)EC1 or later releases of 12.1EC³

Cisco IOS Release 12.2(4)BC1 or later releases of 12.2BC

—

•Cisco uBR7246

—

¹Cisco IOS Release 12.1(5)T and later releases of 12.1T require a minimum of 128 MB of SRAM or SDRAM.

²Previous documentation stated that the NPE-175 was also supported on the Cisco uBR7200 series routers. Because the NPE-175 has reached its end of life and was never made orderable on the Cisco uBR7200 series routers, it is shown as no longer supported for the Cisco uBR7200 series routers.

³Cisco IOS Release 12.1(8)EC or later is required to use the MEM-SD-NSE-256MB memory module in the NPE-225.

Table 3-5 Software Requirements for the NPE-200, NPE-150, and NPE-100

Router Platform

NPE-200¹

NPE-150¹

NPE-100¹

Cisco 7200 series

•Cisco 7204VXR and Cisco 7206VXR

Cisco IOS Release 12.0(2)XE2 or later releases of 12.0XE
Cisco IOS Release 12.0(3)T or later releases of 12.0T

•Cisco 7204 and Cisco 7206

Cisco IOS Release 11.1(13)CA or later releases of 11.1CA

Cisco IOS Release 11.1(17)CC or later releases of 11.1CC

Cisco IOS Release 11.2(12)P or later releases of 11.2P

Cisco IOS Release 11.3(2)T or later releases of 11.3T

Cisco IOS Release 11.3(2)AA or later releases of 11.3AA

Cisco IOS Release 11.1(5)

Cisco IOS Release 11.1(8)

•Cisco 7202

—

Cisco IOS Release 11.1(19)CC1 or later releases of 11.1CC

Cisco IOS Release 11.3(4)AA or later releases of 11.3AA

—

Cisco AS5800 Universal Access Server²

•Cisco 7206VXR router shelf

—

—

—

•Cisco 7206 router shelf

Cisco IOS Release 11.3(2)AA or later releases of 11.3AA

—

—

Cisco uBR7200 series

•Cisco uBR7246 VXR

—

—

—

•Cisco uBR7246

Cisco IOS Release 11.3(6)NA or later releases of 11.3NA

Cisco IOS Release 12.0(6)SC or later releases of 12.0SC

Cisco IOS Release 12.1(3a)EC1 or later releases of 12.1EC

Cisco IOS Release 12.2(4)BC1 or later releases of 12.2BC

—

¹Cisco IOS Release 12.1(5)T and later releases of 12.1 T require a minimum of 128 MB of SRAM or SDRAM.

²For information about the Cisco 7206 or 7206VXR as router shelves in the Cisco AS5800 Universal Access Server, refer to the Cisco AS5800 Universal Access Server documentation listed on Cisco.com.

Upgrading the Boot Helper Image

The boot helper image resides in Flash memory on the I/O controller and contains a subset of the Cisco IOS software. This image is used to boot your router from the network or to load Cisco IOS images onto the router. This image is also used if the system cannot find a valid system image.

Your boot helper image should correspond to the Cisco IOS release that is running on your router. When you upgrade your Cisco IOS software to the minimum required software release (see Table 3-3, Table 3-4, and Table 3-5), we recommend that you also upgrade your boot helper image.

Also see the Cisco 7200 Series Routers Boot Images Information document for boot image information.

Note The Cisco 7200 boot image in Cisco IOS Release 12.0 and Cisco IOS Release 12.1 is oversized. If you need to upgrade the Cisco 7200 boot image, use the boot image in Cisco IOS Release 12.0S in place of the boot image in Cisco IOS Release 12.0 or Cisco IOS Release 12.1 releases. See the field notice Oversized Cisco 7200/uBR7200 BootImage document.

Make sure you upgrade the boot helper (boot loader) image on any previously purchased I/O controller before attempting to boot a Cisco 7200 VXR router or Cisco uBR7246VXR router that has a newly installed NPE-175, NPE-225, NPE-300, or NPE-400. When you install or upgrade the NPE-G1, NPE-G2, UBR7200-NPE-G1, or UBR7200-NPE-G2 you do not need to update the boot image because it is already installed on the processor at the factory.

To upgrade your boot helper image, obtain the most current boot helper image through Cisco.com and copy the new boot helper image to Flash memory on your router. For information on how to access Cisco.com, see the "Obtaining Documentation and Submitting a Service Request" section on page ix.

To obtain a boot helper image from Cisco.com and upgrade your bootflash, do the following:

Step 1 Download the boot helper image from Cisco.com to a TFTP server.

Step 2 Reformat the Flash memory on your router as follows:
router# format bootflash:
Format operation may take a while. Continue? [confirm]
Format operation will destroy all data in "bootflash:".  Continue? [confirm]
Formatting sector ...   
Format of bootflash:complete
Note Reformatting Flash memory erases the current Flash memory contents.

Step 3 Copy the boot helper image from the TFTP server to Flash memory as follows:
router# copy tftp bootflash:
Address or name of remote host []? biff
Source filename []? c7200-boot-mz.120-5.S
Destination filename [c7200-boot-mz.120-5.S]? 
Accessing tftp://biff/c7200-boot-mz.120-5.S...
Loading c7200-boot-mz.120-5.S from 192.168.254.254 (via 
Ethernet4/0):!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 3132516/6264832 bytes]
3132516 bytes copied in 28.488 secs (111875 bytes/sec)
This completes the procedure for upgrading your boot helper image. For more detailed instructions on loading and maintaining system images and microcode, including boot helper images, refer to the
Cisco IOS Configuration Fundamentals Configuration Guide and the Cisco 7200 Series Routers Boot Images Information document.

Safety Guidelines

Following are safety guidelines that you should follow when working with any equipment that connects to electrical power or telephone wiring.

Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030

Safety Warnings

Warning

IMPORTANT SAFETY INSTRUCTIONS
This warning symbol 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. Use the statement number provided at the end of each warning to locate its translation in the translated safety warnings that accompanied this device. Statement 1071

SAVE THESE INSTRUCTIONS

Waarschuwing

BELANGRIJKE VEILIGHEIDSINSTRUCTIES

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 de standaard praktijken om ongelukken te voorkomen. Gebruik het nummer van de verklaring onderaan de waarschuwing als u een vertaling van de waarschuwing die bij het apparaat wordt geleverd, wilt raadplegen.

BEWAAR DEZE INSTRUCTIES

Varoitus

TÄRKEITÄ TURVALLISUUSOHJEITA

Tämä varoitusmerkki merkitsee vaaraa. Tilanne voi aiheuttaa ruumiillisia vammoja. Ennen kuin käsittelet laitteistoa, huomioi sähköpiirien käsittelemiseen liittyvät riskit ja tutustu onnettomuuksien yleisiin ehkäisytapoihin. Turvallisuusvaroitusten käännökset löytyvät laitteen mukana toimitettujen käännettyjen turvallisuusvaroitusten joukosta varoitusten lopussa näkyvien lausuntonumeroiden avulla.

SÄILYTÄ NÄMÄ OHJEET

Attention

IMPORTANTES INFORMATIONS DE SÉCURITÉ

Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant entraîner des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers liés aux circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions des avertissements figurant dans les consignes de sécurité traduites qui accompagnent cet appareil, référez-vous au numéro de l'instruction situé à la fin de chaque avertissement.

CONSERVEZ CES INFORMATIONS

Warnung

WICHTIGE SICHERHEITSHINWEISE

Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu Verletzungen führen kann. Machen Sie sich vor der Arbeit mit Geräten mit den Gefahren elektrischer Schaltungen und den üblichen Verfahren zur Vorbeugung vor Unfällen vertraut. Suchen Sie mit der am Ende jeder Warnung angegebenen Anweisungsnummer nach der jeweiligen Übersetzung in den übersetzten Sicherheitshinweisen, die zusammen mit diesem Gerät ausgeliefert wurden.

BEWAHREN SIE DIESE HINWEISE GUT AUF.

Avvertenza

IMPORTANTI ISTRUZIONI SULLA SICUREZZA

Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di intervenire su qualsiasi apparecchiatura, occorre essere al corrente dei pericoli relativi ai circuiti elettrici e conoscere le procedure standard per la prevenzione di incidenti. Utilizzare il numero di istruzione presente alla fine di ciascuna avvertenza per individuare le traduzioni delle avvertenze riportate in questo documento.

CONSERVARE QUESTE ISTRUZIONI

Advarsel

VIKTIGE SIKKERHETSINSTRUKSJONER

Dette advarselssymbolet betyr fare. Du er i en situasjon som kan føre til skade på person. Før du begynner å arbeide med noe av utstyret, må du være oppmerksom på farene forbundet med elektriske kretser, og kjenne til standardprosedyrer for å forhindre ulykker. Bruk nummeret i slutten av hver advarsel for å finne oversettelsen i de oversatte sikkerhetsadvarslene som fulgte med denne enheten.

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INSTRUÇÕES IMPORTANTES DE SEGURANÇA

Este símbolo de aviso significa perigo. Você está em uma situação que poderá ser causadora de lesões corporais. Antes de iniciar a utilização de qualquer equipamento, tenha conhecimento dos perigos envolvidos no manuseio de circuitos elétricos e familiarize-se com as práticas habituais de prevenção de acidentes. Utilize o número da instrução fornecido ao final de cada aviso para localizar sua tradução nos avisos de segurança traduzidos que acompanham este dispositivo.

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¡Advertencia!

INSTRUCCIONES IMPORTANTES DE SEGURIDAD

Este símbolo de aviso indica peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considere los riesgos de la corriente eléctrica y familiarícese con los procedimientos estándar de prevención de accidentes. Al final de cada advertencia encontrará el número que le ayudará a encontrar el texto traducido en el apartado de traducciones que acompaña a este dispositivo.

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Varning!

VIKTIGA SÄKERHETSANVISNINGAR

Denna varningssignal 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 vanliga förfaranden för att förebygga olyckor. Använd det nummer som finns i slutet av varje varning för att hitta dess översättning i de översatta säkerhetsvarningar som medföljer denna anordning.

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Aviso

INSTRUÇÕES IMPORTANTES DE SEGURANÇA

Este símbolo de aviso significa perigo. Você se encontra em uma situação em que há risco de lesões corporais. Antes de trabalhar com qualquer equipamento, esteja ciente dos riscos que envolvem os circuitos elétricos e familiarize-se com as práticas padrão de prevenção de acidentes. Use o número da declaração fornecido ao final de cada aviso para localizar sua tradução nos avisos de segurança traduzidos que acompanham o dispositivo.

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Advarsel

VIGTIGE SIKKERHEDSANVISNINGER

Dette advarselssymbol betyder fare. Du befinder dig i en situation med risiko for legemesbeskadigelse. Før du begynder arbejde på udstyr, skal du være opmærksom på de involverede risici, der er ved elektriske kredsløb, og du skal sætte dig ind i standardprocedurer til undgåelse af ulykker. Brug erklæringsnummeret efter hver advarsel for at finde oversættelsen i de oversatte advarsler, der fulgte med denne enhed.

GEM DISSE ANVISNINGER

Electrical Equipment Guidelines

Follow these basic guidelines when working with any electrical equipment:

•Before beginning any procedures requiring access to the chassis interior, locate the emergency power-off switch for the room in which you are working.

•Disconnect all power and external cables before moving a chassis.

•Do not work alone when potentially hazardous conditions exist.

•Never assume that power has been disconnected from a circuit; always check.

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

•Carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.

Telephone Wiring Guidelines

Use the following guidelines when working with any equipment that is connected to telephone wiring or to other network cabling:

•Never install telephone wiring during a lightning storm.

•Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.

•Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.

•Use caution when installing or modifying telephone lines.

Electrostatic Discharge Prevention

Electrostatic discharge (ESD) damages equipment and impairs electrical circuitry. ESD occurs when printed circuit boards or memory SIMMs or DIMMs are improperly handled and results in complete or intermittent failures.

The I/O controller and network processing engine or network services engine consist of a printed circuit board that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of the carrier. Hold the I/O controller and network processing engine or network services engine by their carrier edges and handle; never touch the printed circuit board or connector pins.

Figure 3-1 shows the location of a printed circuit board in a network processing engine or network services engine and an I/O controller metal carrier. Do not touch the printed circuit board when handling any of the components.

Figure 3-1 Handling the I/O Controller and the Network Processing Engine
or Network Services Engine

1

Printed circuit board

2

Metal carrier

Handle SIMMs or DIMMs by the edges only. Avoid touching the memory modules, pins, or traces—the metal fingers along the connector edge of the SIMM or DIMM. (See Figure 3-2.) Always wear a preventive antistatic wrist strap whenever you handle SIMMs or DIMMs.

Figure 3-2 Handling a SIMM or DIMM

Although the metal carrier helps to protect the I/O controller and the network processing engine or network services engine from ESD, wear a preventive antistatic strap whenever handling the I/O controller, network processing engine, or network services engine. Ensure that the strap makes good skin contact and connect the strap's clip to an unpainted chassis surface to safely channel unwanted ESD voltages to ground.

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

Caution Make sure to tighten the captive installation screws on the network processing engine or network services engine, Cisco uBR7200 series cable modem cards, and the I/O controller (use a number 2 Phillips or a 3/16-inch flat-blade screwdriver). These screws prevent accidental removal, provide proper grounding for the router, and help to ensure that the network processing engine or network services engine, Cisco uBR7200 series cable modem cards, and the I/O controller are properly seated in the router midplane.

Following are guidelines for preventing ESD damage:

•Always use an ESD wrist strap or ankle strap when installing or replacing the I/O controller, network processing engine or network services engine, Cisco uBR7200 series cable modem cards, or port adapters. Ensure that the ESD strap makes contact with your skin.

•Handle the I/O controller, network processing engine or network services engine, Cisco uBR7200 series cable modem cards, or port adapters by their metal carrier edges and handles; avoid touching the printed circuit board or any connector pins.

•When removing the I/O controller, network processing engine or network services engine, Cisco uBR7200 series cable modem cards, or port adapters, place them on an antistatic surface with the printed circuit board components facing upward, or in a static shielding bag. If you are returning an I/O controller, network processing engine, Cisco uBR7200 series cable modem card, or port adapter to the factory, immediately place it in a static shielding bag.

Caution Periodically check the resistance value of the antistatic strap. The measurement should be within the range of 1 and 10 megohms (Mohms).

Ensuring Easy Access to the Router

If your Cisco 7200 series router or Cisco uBR7200 series router is installed in a standard 19-inch, four-post rack or telco-type rack, cables from other equipment in the rack might obstruct access to the rear of the router. Also, rack power strips or other permanent fixtures may obstruct access to the router. Review the following guidelines to ensure easy access to the rear of the router when it is installed in a rack. If the router is not installed in a rack, or if you already have clear access to the rear of the router, proceed to Chapter 4, "Installing and Removing SDRAM and DRAM."

Use the following guidelines to ensure easy access to the rear of the router when it is installed in a rack:

•Ensure that you have at least 3 to 4 feet (0.9 to 1.3 meters) of working space at the rear of the router.

•If cables from other equipment in the rack fall in front of the rear end of the router, carefully gather the cables (using care not to strain them) and use cable ties to anchor them away from the rear of the router.

•If access to the rear of the router is partially blocked by a power strip or some other permanent rack fixture, detach the router from the rack and carefully slide it forward until there is enough clearance to remove the power supply, the network processing engine or network services engine, and the subchassis from the router. Detailed steps for detaching the router from the rack are contained in the "Removing the Network Processing Engine or Network Services Engine" section on page 4-8.

Caution Make sure that at least one other person is available to support the front of the router as you slide it out from the rack and, if necessary, to continue to support it while you remove and insert the power supply, network processing engine or network services engine, or subchassis.