Cisco 2600 Series User manual

About This Guide ix
About This Guide
This preface discusses the objectives, audience, organization, and conventions of this
network module hardware installation guide.
Objectives
This publication provides hardware installation information for Cisco network modules
used in Cisco 3600 series and Cisco 2600 series modular access routers, referred to as
Cisco modular routers.
This publication describes a variety of router models that are similar in functionality, but
differ in the number of interfaces supported. Some information provided might not apply
to your particular router model.
How to Use This Guide
This guide contains an overview of network modules and information on connecting
specific network modules to your Cisco modular router. Refer to Table 1-1 in Chapter 1,
“Overview of Cisco Network Modules” for a listing of network modules supported by
Cisco 3600 series routers and the required release of Cisco IOS software for each module.
Refer to Table 1-2 in Chapter 1, “Overview of Cisco Network Modules” for a listing of
network modules supported by Cisco 2600 series routers and the required release of
Cisco IOS software for each module.
If required, see Chapter 3, “Installing Network Modules in Cisco Modular Routers” for
instructions on installing a network module in your router.

Audience
Cisco Network Modules Hardware Installation Guide
x
Refer to the Software Configuration Guide (for Cisco 3600 series and Cisco 2600 series
routers) for an overview of network module configuration procedures and information on
configuring specific network modules.
AudienceThis guide is designed for the person installing the modular router, who should be familiar
with electronic circuitry and wiring practices and have experience as an electronic or
electromechanical technician.
Organization
The major sections of this guide include:
Chapter Title Description
Chapter 1 Overview of Cisco Network
Modules Lists the network module options for Cisco 3600 series and Cisco 2600 series modular routers.
Chapter 2 Preparing to Install Network
Modules Discusses safety information, and describes the various tools and equipment required to install a network module.
Chapter 3 Installing Network Modules in
Cisco Modular Routers Includes basic installation information for installing network modules in Cisco 3600 series and Cisco 2600 series modular
routers.
Chapter 4 Connecting Ethernet Network
Modules to a Network Discusses basic hardware installation information for connecting the various Ethernet network modules to a network, and
describes the network module LEDs.
Chapter 5 Connecting Fast Ethernet PRI
Network Modules to a Network Discusses basic hardware installation information for connecting the Fast Ethernet Primary Rate Interface (PRI) network modules
to a network, and describes the network module LEDs.
Chapter 6 Connecting Serial Network
Modules to a Network Discusses basic hardware installation information for connecting the various serial network modules to a network, and describes
the network module LEDs.

About This Guide xi
Organization
Chapter 7 Connecting ISDN BRI Network
Modules to a Network Discusses basic hardware installation information for connecting the various Integrated Services Digital Network (ISDN) Basic
Rate Interface (BRI) network modules to a network, and
describes the network module LEDs.
Chapter 8 Connecting ISDN PRI Network
Modules to a Network Discusses basic hardware installation information for connecting the various ISDN PRI network modules to a network, and
describes the network module LEDs.
Chapter 9 Connecting Voice Network
Modules to a Network Discusses basic hardware installation information for connecting the various voice network modules to a network, and describes
the network module LEDs.
Chapter 10 Connecting Digital
Modem Network Modules to a
Network
Discusses basic hardware installation information for connecting
the various digital modem network modules to a network, and
describes the network module LEDs.
Chapter 11 Connecting Analog Modem
Network Modules to a Network Discusses basic hardware installation information for connecting analog modem network modules to a network, and describes the
network module LEDs.
Chapter 12 Connecting ATM Network
Modules to a Network Discusses basic hardware installation information for connecting Asynchronous Transfer Mode (ATM) network modules to a
network, and describes the network module LEDs.
Chapter 13 Connecting HSSI Network
Modules to a Network Discusses basic hardware installation information for connecting High-Speed Serial Interface (HSSI) network modules to a
network, and describes the network module LEDs.
Chapter 14 Connecting Compression Network
Modules to a Network Discusses basic hardware installation information for connecting compression network modules to a network, and describes the
network module LEDs.
Appendix A FCC Class B Compliance Contains the compliance statement for a Class B digital
device that satisfies the specifications in part 15 of the FCC rules.
Chapter Title Description

Conventions
Cisco Network Modules Hardware Installation Guide
xii
Conventions
This publication uses the following conventions to convey instructions and information:
Convention Description
boldface font Commands and keywords.
italic font Variables for which you supply values.
[ ] Keywords or arguments that appear within square brackets are optional.
{x | y | z} A choice of required keywords appears in braces separated by vertical bars. You must
select one.
screen font Examples of information displayed on the screen.
boldface screen font Examples of information you must enter.
< > Nonprinting characters, for example passwords, appear in angle brackets.
[ ] Default responses to system prompts appear in square brackets.
Note Means reader take note. Notes contain helpful suggestions or references to additional
information and material.
Timesaver This symbol means the described action saves time. You can save time
by performing the action described in the paragraph.
Caution This symbol means reader be careful. In this situation, you might do
something that could result in equipment damage or loss of data.
Warning 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.
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.
12
6
93

About This Guide xiii
Conventions
Varoitus Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa
ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää
sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien
ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen
mukana olevasta Regulatory Compliance and Safety Information -kirjasesta
(määräysten noudattaminen ja tietoa turvallisuudesta).
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une
situation pouvant causer des blessures ou des dommages corporels. Avant de travailler
sur un équipement, soyez conscient des dangers posés par les circuits électriques et
familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents.
Pour prendre connaissance des traductions d’avertissements figurant dans cette
publication, consultez le document Regulatory Compliance and Safety Information
(Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation,
die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem
Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren
und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in
dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory
Compliance and Safety Information (Informationen zu behördlichen Vorschriften und
Sicherheit), das zusammen mit diesem Gerät geliefert wurde.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe
causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre
conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche
standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in
questa pubblicazione si trova nel documento Regulatory Compliance and Safety
Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna
questo dispositivo.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre
til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de
faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig
praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene
som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and
Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble
levert med denne enheten.
Convention Description

Cisco Connection Online
Cisco Network Modules Hardware Installation Guide
xiv
Cisco Connection Online
Cisco Connection Online (CCO) is Cisco Systems’ primary, real-time support channel.
Maintenance customers and partners can self-register on CCO to obtain additional
information and services.
Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-
added services to Cisco’s customers and business partners. CCO services include product
information, product documentation, software updates, release notes, technical tips, the
Bug Navigator, configuration notes, brochures, descriptions of service offerings, and
download access to public and authorized files.
CCO serves a wide variety of users through two interfaces that are updated and enhanced
simultaneously: a character-based version and a multimedia version that resides on the
World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit,
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá
causar danos físicos. Antes de começar a trabalhar com qualquer equipamento,
familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer
práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos
avisos que constam desta publicação, consulte o documento Regulatory Compliance
and Safety Information (Informação de Segurança e Disposições Reguladoras) que
acompanha este dispositivo.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su
integridad física. Antes de manipular cualquier equipo, considerar los riesgos que
entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de
prevención de accidentes. Para ver una traducción de las advertencias que aparecen en
esta publicación, consultar el documento titulado Regulatory Compliance and Safety
Information (Información sobre seguridad y conformidad con las disposiciones
reglamentarias) que se acompaña con este dispositivo.
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som
kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara
medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga
skador. Se förklaringar av de varningar som förkommer i denna publikation i
dokumentet Regulatory Compliance and Safety Information (Efterrättelse av
föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.
Convention Description

About This Guide xv
Ordering Documentation
Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over
lower bandwidths. The WWW version of CCO provides richly formatted documents with
photographs, figures, graphics, and video, as well as hyperlinks to related information.
You can access CCO in the following ways:
•WWW: http://www.cisco.com
•WWW: http://www-europe.cisco.com
•WWW: http://www-china.cisco.com
•Telnet: cco.cisco.com
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ForacopyofCCO’sFrequently AskedQuestions (FAQ),contact [email protected]. For
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Note If you are a network administrator and need personal technical assistance with a
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Please use CCO to obtain general information about Cisco Systems, Cisco products, or
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Ordering Documentation
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Ordering Documentation
Cisco Network Modules Hardware Installation Guide
xvi
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CHAPTER
Overview of Cisco Network Modules 1-1
1
Overview of Cisco Network
Modules
This chapter provides an overview of Cisco network modules used in Cisco modular access
routers. Cisco modular routers include:
•Cisco 3600 Series Routers on page 1-1
•Cisco 2600 Series Routers on page 1-7
Cisco 3600 Series Routers
Table 1-1liststhe networkmoduleoptionsavailable for Cisco 3600 series routers with their
minimum software requirements for Cisco IOS Releases 11.1, 11.2, 11.3, and 11.3 T.
Table 1-1 Network Module Options with Cisco IOS Releases for Cisco 3600 Series Routers
Network Module Cisco Product Number Cisco IOS Release 11.1 Cisco IOS Release 11.2 Cisco IOS Release 11.3 Cisco IOS Release 11.3 T
1-Port Ethernet NM-1E – 11.2(4)XA,
11.2(5)P 11.3(1) 11.3(1)T
1-Port Fast Ethernet TX NM-1FE-TX – 11.2(6)P 11.3(1) 11.3(1)T
1-Port Fast Ethernet FX NM-1FE-FX – – – 11.3(1)T
1-Port Fast Ethernet
1-Port or 2-Port
T1/ISDN1PRI2
NM-1FE1CT1
NM-1FE1CT1-CSU
NM-1FE2CT1
NM-1FE2CT1-CSU
– – – 11.3(4)T

Cisco 3600 Series Routers
Cisco Network Modules Hardware Installation Guide
1-2
1-Port Fast Ethernet
1-Port or 2-Port
E1/ISDN PRI
NM-1FE1CE1B
NM-1FE1CE1U
NM-1FE2CE1B
NM-1FE2CE1U
– – – 11.3(4)T
4-Port Ethernet NM-4E – 11.2(6)P 11.3(1) 11.3(1)T
1-Port Ethernet 2 WAN
card slots NM-1E2W 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
2-Port Ethernet 2 WAN
card slots NM-2E2W 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
1-Port Ethernet 1-Port
Token Ring 2 WAN card
slots
NM-1E1R2W 11.1(8)AA 11.2(4)XA,
11.2(5)P 11.3(1) 11.3(1)T
4-Port Serial NM-4T – 11.2(4)XA,
11.2(5)P 11.3(1) 11.3(1)T
4-Port/8-Port
Asynchronous/
Synchronous Serial
NM-4A/S
NM-8A/S 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
16-Port/32-Port
Asynchronous Serial NM-16A NM-32A – 11.2(7a)P 11.3(1) 11.3(1)T
4-Port/8-Port ISDN
BRI3S/T4NM-4B-S/T
NM-8B-S/T 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
4-Port/8-Port ISDN
BRI5with NT16NM-4B-U
NM-8B-U 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
Table 1-1 Network Module Options with Cisco IOS Releases for Cisco 3600 Series Routers
Network Module Cisco Product Number Cisco IOS Release 11.1 Cisco IOS Release 11.2 Cisco IOS Release 11.3 Cisco IOS Release 11.3 T

Overview of Cisco Network Modules 1-3
Cisco 3600 Series Routers
1-Port/2-Port
Channelized
T1/ISDN PRI
NM-1CT1
NM-2CT1 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
1-Port/2-Port
Channelized T1/ISDN
PRI with CSU7
NM-1CT1-CSU
NM-2CT1-CSU 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
1-Port/2Port
Channelized E1/ISDN
PRI Unbalanced
NM-1CE1U
NM-2CE1U 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
1-Port/2-Port
Channelized
E1/ISDN PRI Balanced
NM-1CE1B
NM-2CE1B 11.1(7)AA 11.2(4)XA, 11.2(5)P 11.3(1) 11.3(1)T
1-Port/2-Port Voice NM-1V
NM-2V – – – 11.3(1)T
6-Port/12-Port/18-Port/
24-Port/30-Port Digital
Modem
NM-6DM
NM-12DM
NM-18DM
NM-24DM
NM-30DM
– 11.2(9)XA
11.2(10)P – 11.3(2)T
8-Port and 16-Port
Analog Modem NM-8AM NM-16AM – – – 11.3(4)T
1-Port ATM8-25 NM-1ATM-25 – – – 11.3(3a)T
Table 1-1 Network Module Options with Cisco IOS Releases for Cisco 3600 Series Routers
Network Module Cisco Product Number Cisco IOS Release 11.1 Cisco IOS Release 11.2 Cisco IOS Release 11.3 Cisco IOS Release 11.3 T

Cisco 3600 Series Routers
Cisco Network Modules Hardware Installation Guide
1-4
Cisco 3600 Series Interface Numbering
Each individual network interface on a Cisco 3600 series router is identified by a slot
number and a unit number.
Slot Numbering
The Cisco 3600 series router chassis contains two or four slots in which you can install
modules. You can install any module into any available slot in the chassis.
As shown in Figure 1-1, the slots are numbered from 0 to 3, as follows:
•Slot 0 is at the bottom right (as viewed from the rear of the chassis), near the power
supply.
•Slot 1 is at the bottom left.
•Slot 2 is at the top right, above slot 0.
•Slot 3 is at the top left, above slot 1.
1-Port HSSI9NM-1HSSI – – – 11.3(3)T
Compression NM-COMPR – 11.2(7a)P 11.3(1) 11.3(1)T
1 ISDN = Integrated Services Digital Network.
2 PRI = Primary Rate Interface.
3 BRI = Basic Rate Interface.
4 The BRI S/T module requires an external NT1.
5 The BRI U module does not require an external NT1.
6 NT1 = Network Termination 1.
7 CSU = channel service unit.
8 ATM = Asynchronous Transfer Mode.
9 HSSI = High-Speed Serial Interface.
Table 1-1 Network Module Options with Cisco IOS Releases for Cisco 3600 Series Routers
Network Module Cisco Product Number Cisco IOS Release 11.1 Cisco IOS Release 11.2 Cisco IOS Release 11.3 Cisco IOS Release 11.3 T

Overview of Cisco Network Modules 1-5
Cisco 3600 Series Interface Numbering
Figure 1-1 Cisco 3600 Series Module Card Slots
Some modules have two small slots, labeled W0 and W1, for WAN interface cards.
Figure 1-2 shows the W0 and W1 slots of the 2 Ethernet 2 WAN card slot
(2E 2-slot) module. You can install WAN interface cards into the small module slots (W0
and W1). Serial WAN interface cards can be installed into either slot, W0 or W1.
Figure 1-2 WAN Interface Card Slots
Slot 0Slot 1 Power supply
Slot 3
H6551
INPUT 100-240VAC 50/60HZ 3.0-1.5 AMPS
2E
2W W1
ETHERNET 1
ETHERNET 0
EN
AUI
WO
ACT
LNK
ACT
LNK
ACT
SERIAL
BRI
NT1
B1
B2
NT1
2
3
1
2E
2WW1
STP
ETHERNET 0
AUI
EN
ACT
LNK
ACT
LNK
DO NOT INSTALL WAN INTERFACE
CARDS WITH POWER APPLIED
Sl
ot
2
ACT
SERIAL
SEE MANUAL BEFORE INSTALLATION
ETHERNET 1
2E
2WW1
STP
ETHERNET 0ETHERNET 1
AUI
EN
ACT LNK
WO
ACT
ILNK
Slot W1 Slot W0
H8603

Cisco 3600 Series Routers
Cisco Network Modules Hardware Installation Guide
1-6
Unit Numbering
Cisco 3600 series routers unit numbers identify the interfaces on the modules and WAN
interface cards installed in the router. Unit numbers begin at 0 for each interface type, and
continue from right to left and (if necessary) from bottom to top. Modules and WAN
interface cards are identified by interface type, slot number, followed by a forward slash
(/), and then the unit number; for example, Ethernet 0/0.
Figure 1-3 shows a router with a 2E 2-slot module in slots 0 and 1. Two serial WAN
interface cards are installed in the module in slot 0. One serial and one ISDN BRI WAN
interface card are installed in the module in slot 1.
Figure 1-3 Cisco 3600 Series Unit Numbers
As shown in Figure 1-3, the unit numbers are as follows:
•Slot 0, Ethernet interface 0, referred to as Ethernet 0/0
•Slot 0, Ethernet interface 1, referred to as Ethernet 0/1
•Slot 0, serial interface 0, referred to as serial 0/0
•Slot 0, serial interface 1, referred to as serial 0/1
•Slot 1, Ethernet interface 0, referred to as Ethernet 1/0
•Slot 1, Ethernet interface 1, referred to as Ethernet 1/1
Power supply
BRI 1/0
Ethernet 1/0 Ethernet 0/1 Ethernet 0/0Ethernet 1/1
H8604
INPUT 100-240VAC 50/60HZ 3.0-1.5 AMPS
2E
2W W1
ETHERNET 1
ETHERNET 0
EN
AUI
WO
ACT
LNK
ACT
LNK
ACT
SERIAL
BRI
NT1
B1
B2
NT1
2
3
1
2E
2WW1
STP
ETHERNET 0
AUI
EN
ACT
LNK
ACT
LNK
ACT
SERIAL
ACT
SEE MANUAL BEFORE INSTALLATION
ETHERNET 1
Serial 1/0 Serial 0/1 Serial 0/0

Overview of Cisco Network Modules 1-7
Cisco 2600 Series Routers
•Slot 1, serial interface 0, referred to as serial 1/0
•Slot 1, BRI interface 0, referred to as BRI 1/0
Note The 2E 2-slot module described in this example provides both an attachment unit
interface (AUI) and 10BaseT port. Only one of these ports can be used at a time. The
module automatically detects which port, AUI or 10BaseT, is in use.
Voice Interface Numbering in Cisco 3600 Series Routers
Voice interfaces are numbered differently from WAN interfaces described in the previous
section, “Unit Numbering.” Voice interfaces are numbered as follows:
interface type chassis slot/voice module slot/voice interface
If you have a four-channel voice network module installed in slot 1 of your router, the voice
interfaces will be:
•Slot 1, voice network module slot 0, voice interface 0, referred to as voice 1/0/0 (closest
to chassis slot 0)
•Slot 1, voice network module slot 0, voice interface 1, referred to as voice 1/0/1
•Slot 1, voice network module slot 1, voice interface 0, referred to as voice 1/1/0
•Slot 1, voice network module slot 1, voice interface 1, referred to as voice 1/1/1 (farthest
from chassis slot 0)
Cisco 2600 Series Routers
Table 1-2liststhe networkmoduleoptionsavailable for Cisco 2600 series routers with their
minimum software requirements for Cisco IOS Release 11.3 and 11.3 T.

Cisco 2600 Series Routers
Cisco Network Modules Hardware Installation Guide
1-8
Table 1-2 Network Module Options with Cisco IOS Releases for Cisco 2600
Series Routers
Network Module Cisco Product Number Cisco IOS Release 11.3 T
1-Port Ethernet NM-1E 11.3(4)T
4-Port Ethernet NM-4E 11.3(4)T
4-Port/8-Port
Asynchronous/Synchronous Serial NM-4A/S NM-8A/S 11.3(3)T, 11.3(2) XA
16-Port/32-Port Asynchronous Serial NM-16A
NM-32A 11.3(3)T, 11.3(2) XA
1-Port/2-Port Voice NM-1V
NM-2V 11.3(3)T, 11.3(2) XA
4-Port/8-Port ISDN BRI
S/T1
1 The BRI S/T module requires an external NT1.
NM-4B-S/T
NM-8B-S/T 11.3(4)T
4-Port/8-Port ISDN BRI2with NT1
2 The BRI U module does not require an external NT1.
NM-4B-U
NM-8B-U 11.3(4)T
1-Port/2-Port Channelized
T1/ISDN PRI NM-1CT1 NM-2CT1 11.3(4)T
1-Port/2-Port Channelized
T1/ISDN PRI with CSU NM-1CT1-CSU NM-2CT1-CSU 11.3(4)T
1-Port/2Port Channelized
E1/ISDN PRI Unbalanced NM-1CE1U NM-2CE1U 11.3(4)T
1-Port/2-Port Channelized
E1/ISDN PRI Balanced NM-1CE1B NM-2CE1B 11.3(4)T
8-Port and 16-Port Analog Modem NM-8AM
NM-16AM 11.3(4)T
1-Port ATM-25 NM-1ATM-25 11.3(4)T

Overview of Cisco Network Modules 1-9
Cisco 2600 Series Interface Numbering
Cisco 2600 Series Interface Numbering
Each individual network interface on a Cisco 2600 series router is identified by a slot
number and a unit number.
Slot and Unit Numbering
The Cisco 2600 series router chassis contains one slot in which you can install a network
module. This is always slot 1.
Unit numbers identify the interfaces on the modules and WAN interface cards installed in
the router. Unit numbers begin at 0 for each interface type, and continue from right to left
and (if necessary) from bottom to top. Modules and WAN interface cards are identified by
interface type, slot number, followed by a forward slash (/), and then the unit number; for
example, Ethernet 0/0.
Figure 1-4 shows a router with a 2E 2-slot module in slot 1. One serial and one ISDN BRI
WAN interface card are installed in the module.
Figure 1-4 Cisco 2600 Series Unit Numbers
Note WAN interface card slots (built into the chassis) are always numbered as slot 0, even
if the interface card is installed in the slot labeled W1.
Cisco 2612
100-240V– 1A
50/60 Hz 47 W
W0
W1
16552
Ethernet
0/0 Auxiliary
port
Console
port
Serial 0/0
Serial 0/1
2E
2W W1
ETHERNET 1
ETHERNET 0
EN
AUI
WO
ACT
LNK
ACT
LNK
ACT
SERIAL
BRI
NT1
B1
B2
NT1
SEE MANUAL BEFORE INSTALLATION
AUX
CONSOLE
ETHERNET 0/0 ACT
LINK
ACT
TOKEN RING 0/0
LINK
SERIALCONN
W0
SERIALCONN
Token
Ring 0/0
Serial 1/0
BRI 1/0
Ethernet
1/0
Ethernet
1/1

Cisco 2600 Series Routers
Cisco Network Modules Hardware Installation Guide
1-10
Figure 1-4 shows the following unit numbers:
•First Ethernet interface, referred to as Ethernet 0/0
•Token ring interface, referred to as Token Ring 0/0
•Slot W0, serial interface 0, referred to as serial 0/0
•Slot W1, serial interface 1, referred to as serial 0/1
•Slot 1, Ethernet interface 0, referred to as Ethernet 1/0
•Slot 1, Ethernet interface 1, referred to as Ethernet 1/1
•Slot 1, serial interface 0, referred to as serial 1/0
•Slot 1, BRI interface 0, referred to BRI 1/0
Note The 2E 2-slot module described in this example provides both an attachment unit
interface (AUI) and 10BaseT port. Only one of these ports can be used at a time. The
module automatically detects which port, AUI or 10BaseT, is in use.
Voice Interface Numbering in Cisco 2600 Series Routers
Voice interfaces are numbered differently from WAN interfaces described in the previous
section, “Slot and Unit Numbering.” Voice interfaces are numbered as follows:
interface type chassis slot/voice module slot/voice interface
If you have a four-channel voice network module installed in slot 1 of your router, the voice
interfaces will be:
•Slot 1, voice network module slot 0, voice interface 0, referred to as voice 1/0/0 (closest
to the chassis WAN interface card slots)
•Slot 1, voice network module slot 0, voice interface 1, referred to as voice 1/0/1
•Slot 1, voice network module slot 1, voice interface 0, referred to as voice 1/1/0
•Slot 1, voice network module slot 1, voice interface 1, referred to as voice 1/1/1 (farthest
from the chassis WAN interface card slots)

CHAPTER
Preparing to Install Network Modules 2-1
2
Preparing to Install Network
Modules
This chapter describes important information to consider before you begin to install
network modules in Cisco modular routers, and includes the following sections:
•Safety Information on page 2-1
•Required Tools and Equipment on page 2-4
Safety Information
This section contains safety warnings that you should be aware of before installing a
network module in the router.
Safety Recommendations
Follow these guidelines to ensure general safety:
•Keep the chassis area clear and dust-free during and after installation.
•Put 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 glasseswhen working under anyconditions that might be hazardous to your
eyes.
•Do not perform any action that creates a potential hazard to people or makes equipment
unsafe.

Safety Information
Cisco Network Modules Hardware Installation Guide
2-2
Safety Warnings
Safety warnings appear throughout this publication in procedures that, if performed
incorrectly, may harm you. A warning symbol precedes each warning statement.
Safety with Electricity
Warning Before working on equipment that is connected to power lines, remove jewelry
(including rings, necklaces, and watches). Metal objects will heat up when connected to
power and ground and can cause serious burns or weld the metal object to the terminals.
Warning To avoid electric shock, do not connect safety extra-low voltage (SELV)
circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits,
and WAN ports contain TNV circuits. Both LAN and WAN ports may use RJ-45
connectors. Use caution when connecting cables.
Warning Hazardous network voltages are present in WAN ports regardless of whether
powerto the router is OFF or ON. To avoid electric shock, use caution when working near
WAN ports. When detaching cables, detach the end away from the router first.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid
contact with telephone-network voltages.
Warning Do not work on the system or connect or disconnect cables during periods of
lightning activity.
Warning Do not touch the power supply when the power cord is connected. For systems
with a power switch, line voltages are present within the power supply even when the
power switch is OFF and the power cord is connected. For systems without a power
switch, line voltages are present within the power supply when the power cord is
connected.