Cisco 3725 User Manual

Installing AC Power Supplies in Cisco 3725
Routers

Product Numbers: PWR-3725-AC=

This document describes how to replace the AC power supplies in a Cisco 3725 router.
This document is intended for the power supply installer, who should be familiar with electronic

circuitry and wiring practices and have experience as an electronic or electromechanical technician. Use
this document in conjunction with the Cisco 3700 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 “Obtaining Technical Assistance” section on page 19.
This document contains the following sections:

• Safety Recommendations, page 2

• Overview of Cisco 3725 AC Power Supplies, page 6

• Required Tools and Equipment, page 6

• Accessing the Power Supply, page 7

• Replacing the Cisco 3725 Power Supply, page 8

• Electrical Connections for Cisco 3725 Routers, page 17

Warning

• Troubleshooting, page 18

• Obtaining Documentation, page 18

• Obtaining Technical Assistance, page 19

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.

Corporate Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA

Copyright © 2002. Cisco Systems, Inc. All rights reserved.

Safety Recommendations

Warning

Warning

Warning

Caution To avoid damaging electrostatic discharge (ESD)-sensitive components, ensure that you have

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.

Before working on a system that has an on/off switch, turn OFF the power and unplug the power
cord. To see translations of the warnings that appear in this publication, refer to the Regulatory
Compliance and Safety Information document that accompanied this device.

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.

discharged all static electricity from your body before opening the chassis. Before performing
procedures described in this document, review the next section, “Safety Recommendations.”

Safety Recommendations

Warning

Warning

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 may get caught in the chassis. Fasten your tie or scarf and roll up

your sleeves.

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

• Do not perform any action that creates a potential ha zard t o pe op le o r m akes the e qu ipm ent unsa fe.

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.

The Ethernet 10BaseT, Token Ring, 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. T o see translat ions of the wa rnings that appea r in
this publication, refer to the Regulatory Compliance and Safety Information document that
accompanied this device.

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Safety with Electricity

Safety Recommendations

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.

Follow these guidelines when working on equipment powered by electricity:

• Locate the room’s emergency power-off switch. Then, if an electrical accident occurs, you can

quickly shut the power off.

• Before working on the system, turn off the power and unplug the power cord.

• Disconnect all power before doing the following:

–

Working on or near power supplies

–

Installing or removing a router chassis or network processor module

–

Performing most hardware upgrades

• Do not work alone if potentially hazardous conditions exist.

• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power

extension cables, and missing safety grounds.

• Never assume that power is disconnected from a circuit. Always check.

• If an electrical accident occurs, proceed as follows:

–

Use caution, and do not become a victim yourself.

–

Turn off power to the system.

–

If possible, send another person to g et medical aid. Otherwise, determine the condition of the
victim and then call for help.

–

Determine if the person needs rescue breathing or external cardiac compressions; then take
appropriate action.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipme nt and impair electrical circuitry. It occurs when
electronic printed circuit cards are improperly handled and can result in complete or intermittent
failures. Always follo w ESD pr ev ention procedures wh en 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 grou nd. To properly guard against ESD damage and shocks, the wrist
strap and cord must operate effectively. 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 (Mohms).

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3

Safety Recommendations

Safety Regulations

Warning

Waarschuwing

Varoitus

Attention

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.

Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel
kan veroorzaken. Voordat u aan enige apparatuur g aat werken, di ent u zich bewust te zijn va n
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.

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

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.

Avvertenza

4

Warnung

Installing AC Power Supplies in Cisco 3725 Routers

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.

Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causa re infortuni alle
persone. Prima di lavorare su qualsiasi apparecchiatura, occorre cono scere 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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FCC Class A Compliance

Advarsel

Aviso

¡Advertencia!

Varning!

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.

Este símbolo de aviso indica perigo. Encontra-se numa situação que lh e po derá causar da nos
físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os
perigos relacionados com circuitos eléctricos, e com quaisquer prá ticas comun s que po ssam
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.

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.

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 Comp liance and Safety
Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna
anordning.

FCC Class A Compliance

The equipment described in this document generates and may radiate r adio- frequenc y ener g y. If it is not
installed in accordance with Cisco installation instructions, it may cause interference with radio and
television reception. This equipment has been tested and found to comply with the limits for a
Class A digital device in accordance with the specifications in part 15 of the FCC rules. These
specifications are designed to provide reasonable protection against such interference in a residential
installation. However, there is no guarantee that interference will not occur in a particular installation.

You can determine whether your equipmen t is causi ng interference by turning it off. If the interference
stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment
causes interference to radio or television reception, try to correct the interference by using one or more
of the following measures:

• Turn the television or radio antenna until the interference stops.

• Move the equipment to one side or the other of the television or radio.

• Move the equipment farther away from the television or radio.

• Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is,

make certain that the equipment and the television or radio are on circuits controlled by different
circuit breakers or fuses.)

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Required Tools and Equipment

AC power supply

Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and
negate your authority to operate the product.

Required Tools and Equipment

Installation might require some tools and equipment that are not provided as standard equipment with
the router. Following are the tools and parts required for a typical router installation:

• Number 2 Phillips screwdriver

• ESD-preventive wrist strap

Overview of Cisco 3725 AC Power Supplies

Figure 1 shows an AC power supply for the Cisco 3725 router.

Note For clarity, the AC and On/Off switch box is not s hown.

Figure 2 shows the location of the power supply in the Cisco 3725 router.

Figure 1 Cisco 3725 AC Power Supply

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Figure 2 Pow er Supply Location in the Cisco 3725 Router

On/Off

power supply

switch box

Overview of Cisco 3725 AC Power Supplies

AC power

supply

Accessing the Power Supply

To access power supplies on the Cisco 3725 router, remove the router cover as described in the “Removing

the Router Cover” section on page 8.

Warning

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.

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 sy stems 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.

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7

Replacing the Cisco 3725 Power Supply

Warning

Warning

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.

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.

Network hazardous voltages are present in the BRI cable. If you detach the BRI cable, detach the
end away from the router first to avoid possible electric shock. Network hazardous voltages also
are present on the system card in the area of the BRI port (RJ-45 connector), regardless of when
power is turned off. T o see translations of the warnings that appear in this publication, refe r to the
Regulatory Compliance and Safety Information document that accompanied this device.

Replacing the Cisco 3725 Power Supply

The power supply and cabling for the Cisco 3725 router is contained inside the chassis. To replace the
power supply, complete these procedures:

• Removing the Router Cover, page 8

• Removing the Cisco 3725 Power Supply, page 9

• Installing the Cisco 3725 Power Supply, page 15

• Replacing the Router Cover, page 16

Removing the Router Cover

To gain access to the Cisco 3725 power supply, you must first remove the chassis cover:

Step 1 Turn off power to the router.
Step 2 Remove all network interface cables from the rear panel.
Step 3 Remove the power cord.

Warning

Step 4 Place the router so the rear panel is closest to you. Remove the six screws located on top of the cover.

Step 5 Lift the front edge of the cover. (See number 1 in Figure 3.)
Step 6 Slide the cover toward the right until the metal tabs on the rear edge separate from the chassis bottom.

When installing the unit, always make the ground connection first and disconnect it last. To see
translations of the warnings that appear in this publication, refer to the Regulatory Compliance
and Safety Information document that accompanied this device.

Set the screws aside in a safe place.

(See number 2 in Figure 3.)

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Figure 3 Removing the Cisco 3725 Cover

Replacing the Cisco 3725 Power Supply

2

1

Step 7 Lift the cover completely off and set it aside.

When you are ready to replace the cover, see the “Replacing the Router Cover” section on page 16.

Removing the Cisco 3725 Power Supply

After you remove the cover from the chassis, follow this procedure to remove the power supply:

Step 1 Find the large and small power connectors on the motherboard and remove them. (See Figure 4.)

Note On a Cisco 3725 router, you can simply lift the connector away from the receptacle. (See

Figure 4.)

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Installing AC Power Supplies in Cisco 3725 Routers

9

Replacing the Cisco 3725 Power Supply

Figure 4 Removing the Cisco 3725 Power Connectors

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10

Installing AC Power Supplies in Cisco 3725 Routers

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Replacing the Cisco 3725 Power Supply

Step 2 The Cisco 3725 power supply connector is held in the chassis by two external mounting screws at the

rear of the router. (See Figure 5.) Remove the screws and set them aside.

Figure 5 Cisco 3725 Power Supply Connector Mounting Screws

Mounting screws

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Installing AC Power Supplies in Cisco 3725 Routers

11

Replacing the Cisco 3725 Power Supply

Step 3 The Cisco 3725 power supply is held in the chassis by one top-level screw towards the front and left

side of the router. (See Figure 6.) Remove the screw and set it aside.

Figure 6 Cisco 3725 Power Supply Mounting Screw

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Replacing the Cisco 3725 Power Supply

Step 4 Lift the power supply On/Off switch box, at an angle, up and out of the chassis. (See Figure 7.)

Figure 7 Cisco 3725 Power Supply Mounting Hinge (Right)

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Installing AC Power Supplies in Cisco 3725 Routers

13

Replacing the Cisco 3725 Power Supply

Step 5 Slide the power supply back slightly in the chassis. Thi s disengages the hoo ks built into the chassis that

help secure the power supply. (See Figure 8.)

Note The DC power supply cannot be present when removing the AC power supply.

Figure 8 Cisco 3725 Power Supply Hinge Disengagement

Bottom of

power supply

Tab

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Replacing the Cisco 3725 Power Supply

Step 6 Pull the power supply back and lift the power supply out of the chassis. (See Figure 9.)

Figure 9 Removing the Cisco 3725 Power Supply from the Chassis

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Installing the Cisco 3725 Power Supply

Follow these steps to install a power supply in the chassis:

Step 1 Place the power supply in the chassis, with the power supply rear panel slightly separated from the

chassis rear panel. This position allows the hook in the chassis to engage the cutout in the bottom of the
power supply. (See Figure 8.)

Step 2 Slide the power supply tow ard the side of the chassis, engaging the hook in the chassis. This enables the

power supply to drop and engage the hinge preventing further movement.

Step 3 Replace the top-level mounting screw that holds the power supply in place. (See Figure 6.)
Step 4 Replace the power supply connectors and the external connector mounting screws at the rear of the

chassis. (See Figure 5.)

Step 5 Insert the large power connector into the receptacle on the motherboard. (See Figure 4.)

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Replacing the Cisco 3725 Power Supply

Replacing the Router Cover

After you finish replacing the power supply, follow these steps to replace the cover:

Step 1 Place the chassis bottom so the front panel is closest to you.
Step 2 Hold the cover so the tabs at the rear of the cover are aligned with the chassis bottom.
Step 3 Push the cover toward the rear, making sure that the cover tabs fit under the chassis back panel, and the

back panel tabs fit under the cover.

Step 4 Slide the cover slightly to the left to lock the cover into position (number 1 in Figure 10).

Figure 10 Replacing the Cisco 3725 Router Cover

1

2

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16

Step 5
Step 6 Fasten the cover with the five screws you set aside earlier.
Step 7 Reinstall the chassis on a rack.
Step 8 Reinstall network interface cables.

Installing AC Power Supplies in Cisco 3725 Routers

Lower the front of the cover onto the chassis (number 2 in Figure 10).

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Electrical Connections for Cisco 3725 Routers

Step 9 Proceed to the “Electrical Connections for Cisco 3725 Routers” section on page 17.

Electrical Connections for Cisco 3725 Routers

This section explains how to connect AC power to Cisco 3725 routers.

Warning

Warning

Note The instal lation mu st comply w ith the 1 996 National Electric Code (NEC) and other applicable

This unit is intended for installation in restricted access areas. A restricted access area is where
access can only be gained by service personnel through the use of a special tool, lock and key, or
other means of security, and is controlled by the authority responsible for the location. To see
translations of the warnings that appear in this publication, refer to the Regulatory Compliance
and Safety Information document that accompanied this device.

Before performing any of the following procedures, ensure that power is OFF. To see translations
of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety
Information document that accompanied this device.

codes.

Note Use copper conductors only.

Powering On the Router

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Warning

Caution Never operate the router unless the unit is completely closed, to ensure adequate cooling.

The plug-socket combination must be accessible at all times because it serves as the main
disconnecting device. To see translations of the warnings that appear in this publication, refer to
the Regulatory Compliance and Safety Information document that accompanied this device.

Take the following steps to power on the router:

Step 1 For routers with AC input, plug the router’s power cord into a three-terminal, single-phase power

source that provides power within the acceptable range.

Step 2 Power on the router. The LED labeled SYSTEM on the front panel should come on.

If you encounter problems when you powe r on the router , see the “Troubleshooting” section that follows.

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17

Troubleshooting

Troubleshooting

Check the following items to help isolate problems with the power supply installation:

• With the power switch on, is the power LED on the front panel on?

–

If not, check the AC or DC in put, A C or DC source, rout er circuit breake r , and the po wer supply
cable (AC) or power supply wiring (DC).

–

Check the power supply connection to the motherboard.

–

If the power LED is still off, the problem might be a power supply failure.

• Does the router shut down after being on a short time?

–

Check the fans. If the fans are not working, the router will overheat and shut itself down.

–

If the fans are not working, check the power supply connections to the fans.

–

Ensure that the chassis intake and exhaust vents are clear.

–

Check the environmental site requirements in your router installation and configuration guide.

Obtaining Documentation

The following sections explain how to obtain documentation from Cisco Systems.

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at the following URL:
http://www.cisco.com
Translated documentation is available at the following URL:
http://www.cisco.com/public/countries_languages.shtml

Documentation CD-ROM

Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM
package, which is shipped with your product. The Documentation CD-R OM is updated monthly and may
be more current than printed documentation. The CD-ROM package is available as a single unit or
through an annual subscription.

Ordering Documentation

Cisco documentation is available in the following ways:

18

• Registered Cisco Direct Customers can order Cisco product documentation from the Networking

Products MarketPlace:
http://www.cisco.com/cgi-bin/order_root.pl

• Registered Cisco.com users can order the Documentation CD-R OM through the o nline Subscription

Store:

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http://www.cisco.com/go/subscription

• Nonregistered Cisco.com users can order documentation through a local account representative by

calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, elsewhere in North
America, by calling 800 553-NETS (6387).

Documentation Feedback

If you are reading Cisco product documentation on Cisco.com, you can submit technical comments
electronically. Click Leave Feedback at the bottom of the Cisco Documentation home page. After you
complete the form, print it out and fax it to Cisco at 408 527-0730.

You can e-mail your comments to [e-mail].
To submit your comments by mail, use the response card behind the front cover of your document, or

write to the following address:
Cisco Systems

Attn: Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883

Obtaining Technical Assistance

We appreciate your comments.

Obtaining Technical Assistance

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can
obtain documentation, troubleshooting tips, and sample configurations from online tools by using the
Cisco Te chnical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to
the technical support resources on the Cisco TAC Web Site.

Cisco.com

Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open
access to Cisco information, networking solutions, services, programs, and resources at any time, from
anywhere in the world.

Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a
broad range of features and services to help you to

• Streamline business processes and improve productivity

• Resolve technical issues with online support

• Download and test software packages

• Order Cisco learning materials and merchandise

• Register for online skill assessment, training, and certification programs

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You can self-register on Cisco.com to obtain customized information and service. To access Cisco.com,
go to the following URL:

http://www.cisco.com

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19

Obtaining Technical Assistance

Technical Assistance Center

The Cisco TAC is available to all customers who need technical assistance with a Cisco product,
technology, or solution. Two types of support are available through the Cisco TAC: the Cisco TAC
Web Site and the Cisco TAC Escalation Center.

Inquiries to Cisco TAC are categorized according to the urgency of the issue:

• Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities,

product installation, or basic product configuration.

• Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably

impaired, but most business operations continue.

• Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects

of business operations. No workaround is available.

• Priority level 1 (P1)—Your production network is down, and a critical impact to business operati ons

will occur if service is not restored quickly. No workaround is available.

Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of
service contracts, when applicable.

Cisco TAC Web Site

The Cisco T AC W eb Site allo ws you to resolv e P3 and P4 issues yourself, saving both cost and time. The
site provides around-the-clock access to online tools, knowledge bases, and software. To acc ess the
Cisco TAC Web Site, go to the following URL:

http://www.cisco.com/tac
All customers, partners, and resellers who have a valid Cisco services contract have complete access to

the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a
Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or
password, go to the following URL to register:

http://www.cisco.com/register
If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a Cisco.com

registered user, you can open a case online by using the TAC Case Open tool at the following URL:
http://www.cisco.com/tac/caseopen
If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC

We b Site.

Cisco TAC Escalation Center

The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority
level 2; these classifications are assigned when severe network degradation significantly impacts
business operations. When you contact t he TAC Escalation Center with a P1 or P2 problem, a Cisco T A C
engineer will automatically open a case.

20

To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to the following
URL:

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml

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Obtaining Technical Assistance

Before calling, please check with your network op erations center to determine the level of Cisco support
services to which your company is entitled; for example, SMARTnet, SMARTnet Onsite, or Network
Supported Accounts (NSA). In addition, please ha ve available your service agreement number and your
product serial number.

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Obtaining Technical Assistance

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All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply
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All rights reserved.

Installing AC Power Supplies in Cisco 3725 Routers

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