Cisco 3640 Series User manual

Quick Start Guide
Cisco 3620 and Cisco 3640 Modular Access Routers
INCLUDING LICENSE AND WARRANTY
Installation, License and Warranty
1Cisco 90-Day Limited Hardware Warranty Terms
2Documents, Equipment, and Tools
3Install Chassis
4Connect Cables
5Power Up the Router
6Perform Initial Configuration
7Interface Numbering
8Where to Go Next
9Obtaining Documentation
10 Documentation Feedback
11 Obtaining Technical Assistance
12 Obtaining Additional Publications and Information

2
1Cisco 90-Day Limited Hardware Warranty Terms
There are special terms applicable to your hardware warranty and various services that you can use during the warranty period.
Your formal Warranty Statement, including the warranties and license agreements applicable to Cisco software, is available on
Cisco.com. Follow these steps to access and download the Cisco Information Packet and your warranty and license agreements
from Cisco.com.
1. Launch your browser, and go to this URL:
http://www.cisco.com/univercd/cc/td/doc/es_inpck/cetrans.htm
The Warranties and License Agreements page appears.
2. To read the Cisco Information Packet, follow these steps:
a. Click the Information Packet Number field, and make sure that the part number 78-5235-03A0 is highlighted.
b. Select the language in which you would like to read the document.
c. Click Go. The Cisco Limited Warranty and Software License page from the Information Packet appears.
d. Read the document online, or click the PDF icon to download and print the document in Adobe Portable Document
Format (PDF).
Note You must have Adobe Acrobat Reader to view and print PDF files. You can download the reader from Adobe’s
website: http://www.adobe.com
3. To read translated and localized warranty information about your product, follow these steps:
a. Enter this part number in the Warranty Document Number field: 78-5236-01C0
b. Select the language in which you would like to read the document.
c. Click Go. The Cisco warranty page appears.
d. Review the document online, or click the PDF icon to download and print the document in Adobe Portable Document
Format (PDF).
You can also contact the Cisco service and support website for assistance:
http://www.cisco.com/public/Support_root.shtml.
Duration of Hardware Warranty
Ninety (90) days.
Replacement, Repair, or Refund Policy for Hardware
Cisco or its service center will use commercially reasonable efforts to ship a replacement part within ten (10) working days after
receipt of a Return Materials Authorization (RMA) request. Actual delivery times can vary, depending on the customer location.
Cisco reserves the right to refund the purchase price as its exclusive warranty remedy.
To Receive a Return Materials Authorization (RMA) Number
Contact the company from whom you purchased the product. If you purchased the product directly from Cisco, contact your Cisco
Sales and Service Representative.
Complete the information below, and keep it for reference:
Company product purchased from
Company telephone number
Product model number
Product serial number
Maintenance contract number

3
2Documents, Equipment, and Tools
User Documentation
All the documents referenced in this quick start guide are available online and on the Cisco documentation CD-ROM. To be
sure of obtaining the latest information, you should access the online documentation.
To view or print a document in its original page format, access the online document, and click on the PDF icon.
For information about accessing user documentation, see the “Where to Go Next” section on page 32.
Items Included with Cisco 3620 and Cisco 3640 Routers
•Rack-mount brackets with screws for 19-inch rack; grounding lug and bracket; power cord
•Rubber chassis feet with adhesive backing (Cisco 3620 only)
•RJ-45-to-DB-9 adapter cable for console connection
•RJ-45-to-DB-25 adapter cable for modem connection
•Ethernet cable for LAN interface (with Cisco 3640 only)
•Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Regulatory Compliance and Safety Information document
•Cisco 3620 and Cisco 3640 Modular Routers Quick Start Guide (this document)
Items Not Included
Individual items in this list may be required for your particular application:
•Optional rack-mount brackets for 23- or 24-inch rack
•Four screws for installing the chassis in a rack
•PC running terminal emulation software for administrative access, or modem for remote administrative access
•Additional cables for LAN, WAN, and voice interfaces
•Phillips screwdriver
•Cable ties for cable management
3Install Chassis
Safety Information
For safety information you need to know before working on your Cisco router, refer to the Cisco 2600 Series, Cisco 3600 Series,
and Cisco 3700 Series Regulatory Compliance and Safety Information document that accompanied this device.
Note To see translations of the warnings that appear in this publication, refer to the Cisco 2600 Series, Cisco 3600 Series,
and Cisco 3700 Series Regulatory Compliance and Safety Information document.

4
Warning Definition
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. To see translations of the warnings that appear in this
publication, refer to 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. Voor een vertaling van de waarschuwingen die in deze publicatie
verschijnen, dient u de vertaalde veiligheidswaarschuwingen te raadplegen die bij dit apparaat
worden geleverd.
Opmerking BEWAAR DEZE INSTRUCTIES.
Varoitus
TÄRKEITÄ TURVALLISUUTEEN LIITTYVIÄ OHJEITA
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 asiakirjassa esitettyjen varoitusten
käännökset löydät laitteen mukana toimitetuista ohjeista.
Huomautus SÄILYTÄ NÄMÄ OHJEET
Attention
IMPORTANTES INFORMATIONS DE SÉCURITÉ
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 les consignes de sécurité traduites qui accompagnent cet
appareil.
Remarque CONSERVEZ CES INFORMATIONS
Warnung
WICHTIGE SICHERHEITSANWEISUNGEN
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 sind im
Lieferumfang des Geräts enthalten.
Hinweis BEWAHREN SIE DIESE SICHERHEITSANWEISUNGEN AUF

5
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. Per le traduzioni
delle avvertenze riportate in questo documento, vedere le avvertenze di sicurezza che accompagnano
questo dispositivo.
Nota CONSERVARE QUESTE ISTRUZIONI
Advarsel
VIKTIGE SIKKERHETSINSTRUKSJONER
Dette varselssymbolet betyr fare. Du befinner deg i en situasjon som kan forårsake personskade. Før
du utfører arbeid med utstyret, bør du være oppmerksom på farene som er forbundet med elektriske
kretssystemer, og du bør være kjent med vanlig praksis for å unngå ulykker. For å se oversettelser av
advarslene i denne publikasjonen, se de oversatte sikkerhetsvarslene som følger med denne enheten.
Merk TA VARE PÅ DISSE INSTRUKSJONENE
Aviso
INSTRUÇÕES IMPORTANTES DE SEGURANÇA
Este símbolo de aviso significa perigo. O utilizador encontra-se numa situação que poderá ser
causadora de lesões corporais. Antes de iniciar a utilização de qualquer equipamento, tenha em
atenção os perigos envolvidos no manuseamento de circuitos eléctricos e familiarize-se com as
práticas habituais de prevenção de acidentes. Para ver traduções dos avisos incluídos nesta
publicação, consulte os avisos de segurança traduzidos que acompanham este dispositivo.
Nota GUARDE ESTAS INSTRUÇÕES
¡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. Vea las traducciones de las advertencias que
acompañan a este dispositivo.
Nota GUARDE ESTAS INSTRUCCIONES
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. Se översättningarna av de varningsmeddelanden som
finns i denna publikation, och se de översatta säkerhetsvarningarna som medföljer denna anordning.
OBS! SPARA DESSA ANVISNINGAR

6
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.
GUARDE ESTAS INSTRUÇÕES

7
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

8
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only
through the use of a special tool, lock and key, or other means of security. Statement 1017
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. Statement 43
Warning This equipment has been designed for connection to TN and IT power systems. Statement 1007

9
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. Some LAN and WAN ports
both use RJ-45 connectors. Use caution when connecting cables. Statement 1021
Warning This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of
a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if
you are uncertain that suitable grounding is available. Statement 1024
Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages
and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other
equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all cards,
faceplates, front covers, and rear covers are in place. Statement 1029
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Warning To prevent personal injury or damage to the chassis, never attempt to lift or tilt the chassis using the handles on
modules (such as power supplies, fans, or cards); these types of handles are not designed to support the weight
of the unit. Statement 1032
Warning Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040
Installing the Chassis
You can set the chassis on a desktop or install it in a rack. A Cisco 3620 chassis can also be mounted on a wall or other flat
surface. See the applicable instructions following.
Caution To prevent damage to the chassis, never attempt to lift or tilt the chassis by the plastic panel on the front. Always
hold the chassis by the metal body.
Rack-Mounting the Chassis
The standard accessory kit contains brackets for mounting the chassis in a 19-inch rack. You can order an optional accessory
kit with brackets and instructions for mounting the chassis in a 23- or 24-inch rack.
You can mount the chassis in the following ways:
•Front panel forward
•Rear panel forward
•In a center-mount telco rack (Center-mounting of Cisco 3640 routers is restricted to 19-inch telco racks and requires the
use of the center-mount bracket in the optional NEBS/ETSI compliance kit.)
Note The rubber feet that are supplied in the accessory kit of the Cisco 3620 are not needed for installation in a rack.

10
Attaching Brackets
Attach the mounting brackets to the chassis as shown in the applicable figure, Figure 1 through Figure 8, using the Phillips-head
screws provided. Attach the second bracket to the opposite side of the chassis.
Note When installed in a 19-inch rack with a 17.5-inch opening, Cisco 3620 and Cisco 3640 routers protrude beyond the
front of the rack.
Figure 1 Cisco 3620 or Cisco 3640 Bracket Attachment—Front Panel Forward (19-Inch Rack with a 17.5-Inch Opening)
Figure 2 Cisco 3620 or Cisco 3640 Bracket Attachment—Front Panel Forward (19-Inch Rack with a 17.75-Inch Opening)
0
ACTIVE
READY
1
PCMCIA
1
0
26329
Note:The second bracket attaches to the other side of the chassis.
0
ACTIVE
READY
123
PCMCIA
1
0
11005
Note: The second bracket attaches to the other side of the chassis.

11
Figure 3 Cisco 3620 or Cisco 3640 Bracket Attachment—Front Panel Forward (23- or 24-Inch Rack)
Figure 4 Cisco 3620 or Cisco 3640 Bracket Attachment—Rear Panel Forward (19-Inch Rack with a 17.5-Inch Opening)
H6252
0
ACTIVE
READY
123
PCMCIA
1
0
Note: The second bracket attaches to the other side of the chassis.
AUI
EN
WO
BRI
S/T
26323
Note: The second bracket attaches to the other side of the chassis.

12
Figure 5 Cisco 3620 or Cisco 3640 Bracket Attachment—Rear Panel Forward (19-Inch Rack with a 17.75-Inch Opening)
Figure 6 Cisco 3620 or Cisco 3640 Bracket Attachment—Rear Panel Forward (23- or 24-Inch Rack)
Figure 7 Cisco 3620 Center-Mount Bracket Attachment
AUI
EN
WO
BRI
S/T
15854
Note: The second bracket attaches to the other side of the chassis.
AUI
EN
WO
BRI
S/T
15855
Note: The second bracket attaches to the other side of the chassis.
72337
ETHERNET 0
AUI
EN
ACT
LNK
ACT
LNK
ACT
SERIAL
0
Note: The second bracket attaches to the other side of the chassis.

13
Figure 8 Cisco 3640 Center-Mount Bracket Attachment (Requires Optional NEBS/ETSI Kit)
Installing Chassis in Rack
Install the chassis in the rack, using the screws provided with the rack. Rack-mounting screws are not provided with the router.
Use two screws for each side.
Wall-Mounting the Cisco 3620 Chassis
Attaching Rubber Feet
If you are mounting a Cisco 3620 on a wall, you must install the rubber feet that are supplied in the accessory kit. They provide
a space for air circulation. Peel the rubber feet from the adhesive strip, and attach one foot at each corner to the bottom of the
chassis. Cisco 3640 routers are not suitable for wall-mounting.
Attaching Brackets
Attach the brackets to the chassis as shown in Figure 9, using the slotted hex-head screws and plastic spacers (supplied in the
accessory kit). Orient each spacer so that the shoulder fits into the slot in the bracket. Attach the second bracket to the opposite
side of the chassis.
Figure 9 Attaching the Brackets for Wall-Mounting a Cisco 3620 Router
Attaching to Wall
Attach the chassis to the wall:
•Position the end nearest the power cable at the top.
•Align the screws (not included) with a wall stud, or use wall anchors.
0
ACTIVE
READY
123
PCMCIA
1
0
10970
Note: The second bracket attaches to the other side of the chassis.
0
ACTIVE
READY
1
PCMCIA
1
0
Note: The second bracket attaches to the other side of the chassis.
H7612

14
Installing on a Desktop
If you are mounting a Cisco 3620 on a desktop, you must install the rubber feet that are supplied in the accessory kit. They
provide a space for air circulation. Peel the rubber feet from the adhesive strip, and attach one foot at each corner to the bottom
of the chassis.
Caution If you place the Cisco 3620 or Cisco 3640 router on a desktop, do not place anything that weighs more than
10 lb (4.5 kg) on top of the chassis.
Grounding the Chassis
You must connect the chassis to a reliable earth ground; the ground wire must be installed in accordance with local electrical
safety standards.
•For NEBS-compliant grounding, use size AWG 6 (13 mm2) wire and the ground lug provided in the accessory kit.
•For NEC-compliant grounding, use size AWG 14 (2 mm2) or larger wire and an appropriate user-supplied ring terminal.
•For EN/IEC 60950-compliant grounding, use size AWG 18 (1 mm2) or larger wire and an appropriate user-supplied ring
terminal.
To connect the chassis to a reliable earth ground, perform the following steps:
Step 1 Attach the ground-lug bracket to the power supply, as shown in Figure 10 or Figure 11. Use a number 2 Phillips
screwdriver and the screw or screws that are already in the router chassis. Tighten the screws to a torque of 8 to 10 in-lb
(0.9 to 1.1 N-m).
For Cisco 3620 routers, use the power-supply retaining screw located at the bottom of the power supply.
For Cisco 3640 routers, use the two power-supply retaining screws: one at the lower left and one at the upper right.
A DC power supply is shown. The ground-lug bracket attachment is similar for an AC power supply and for a
Cisco redundant power supply (RPS).
Figure 10 Required Ground-Lug Bracket Attachment on a Cisco 3620 Router (DC Power Supply Shown)
15849
Bracket
Power
supply

15
Figure 11 Required Ground-Lug Bracket Attachment on a Cisco 3640 Router (DC Power Supply Shown)
Step 2 Strip one end of the ground wire to the length required for the ground lug or terminal.
•For the NEBS ground lug—approximately 0.75 in. (20 mm)
•For user-provided ring terminal—as required
Step 3 Crimp the ground wire to the ground lug or ring terminal, using a crimp tool of the appropriate size.
Step 4 Attach the ground lug to the ground-lug bracket as shown in Figure 12, Figure 13, or Figure 14, or attach the ring
terminal to the ground-lug bracket as shown in Figure 15, Figure 16, or Figure 17. For the ground lug, use the two
screws with captive locking washers provided. For a ring terminal, use one of the screws provided. Use a number 2
Phillips screwdriver, and tighten the screws to a torque of 8 to 10 in-lb (0.9 to 1.1 N-m).
Where a DC power supply is shown, the attachment would be similar for an AC power supply.
Diagonal attachment of the ground lug to the bracket provides clearance for the RPS power cable.
Step 5 Connect the other end of the ground wire to a suitable grounding point at your site.
Figure 12 NEBS-Compliant Ground Lug Attachment on a Cisco 3620 Router with Internal AC or DC Power Supply
15846
Power
supply
Bracket
Mounting
screws
Bracket
Ground lug mounted
on a Cisco 3620 router
without Cisco RPS
15850
Power
supply

16
Figure 13 NEBS-Compliant Ground Lug Attachment on a Cisco 3620 Router with Redundant Power Supply (Cisco RPS)
Figure 14 NEBS-Compliant Ground Lug Attachment on a Cisco 3640 Router
Figure 15 Ground Lug Attachment Using Ring Terminal on a Cisco 3620 Router with Internal AC or DC Power Supply
DC INPUT FOR USE WITH CISCO RPS
+5V– ––14A, +12V– ––5A, -12V– ––3A
Bracket
Power
supply
Ground lug
mounted on a
Cisco 3620 router
with Cisco RPS
15851
15847
Power
supply
Ground lug
Bracket
Ring terminal
attached
to a bracket
103009
Power
supply

17
Figure 16 Ground Lug Attachment Using Ring Terminal on a Cisco 3620 Router with Redundant Power Supply (Cisco RPS)
Figure 17 Ground Lug Attachment Using Ring Terminal on a Cisco 3640 Router
DC INPUT FOR USE WITH CISCO RPS
+5V– ––14A, +12V– ––5A, -12V– ––3A
Power
supply
103010
Ring terminal
attached
to a bracket
Bracket
103011
Power
supply
Ring terminal

18
4Connect Cables
Warning Do not work on the system, or connect or disconnect cables during periods of lightning activity. Statement 1001
System Management Connections
The connections described in Table 1 provide system management access.
Power Connections
Warning Read the installation instructions before connecting the system to the power source. Statement 1004
Note The installation must comply with all required electrical codes applicable at the installation site.
Connecting Routers to AC Power
If your router uses AC power, connect it to a 15 A, 120 VAC (10A, 240 VAC) circuit with overcurrent protection.
Note The input voltage tolerance limits for AC power are 85 and 264 VAC.
Warning AC connected units must have a permanent ground connection in addition to the power cable ground wire.
NEBS-compliant grounding satisfies this requirement. Statement 284
Warning This product relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated not greater than:
15A, 120VAC (10A, 240VAC). Statement 1005
Connecting Routers to DC Power
If your router has a DC-input power supply, follow the directions in this section for proper wiring.
Warning This product relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated not greater than:
15A, 60VDC. Statement 1005
Warning Use copper conductors only. Statement 1025
Table 1 System Management and Power Connections
Port Color Connected to: Cable
Console Light blue PC or ASCII terminal communication port (usually labeled COM) RJ-45-to-DB-9 adapter cable
Auxiliary Black Modem for remote access RJ-45-to-DB-25 adapter cable

19
DC Wiring Requirements
Cisco 3620 and Cisco 3640 routers with a DC-input power supply require copper wire for the power connections.
For Cisco 3640 routers, DC power connections require crimp-type ring terminals or spade terminals with upturned lugs.
Wiring Procedure for DC Input
To connect the router to a DC power source, perform this procedure.
Step 1 Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the circuit breaker
for the DC circuit, switch the circuit breaker to the OFF position, and tape circuit-breaker switch in the OFF position.
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Tip Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
Step 2 For Cisco 3620 routers, strip the wires to the appropriate length for the terminal block on the power supply.
For Cisco 3640 routers, crimp appropriate ring terminals or spade terminals to the DC power input wires. Strip the
wires to the appropriate length for the terminals used. The following warning applies to Cisco 3640 routers:
Warning When stranded wiring is required, useapproved wiring terminations, such as closed-loop or spade-type terminals
with upturned lugs. These terminations should be the appropriate size for the wires and should clamp both the
insulation and conductor. Statement 1002
Step 3 Connect the DC power input wires to the terminal block as shown in Figure 18 or Figure 19.
Warning The illustration shows the DC power supply terminal block. Wire the DC power supply as illustrated. The proper
wiring sequence is ground to ground, positive to positive, and negative to negative. The ground wire should
always be connected first and disconnected last. Statement 239
Warning An exposed wire lead from a DC-input power source can conduct harmful levels of electricity. Be sure that no
exposed portion of the DC-input power source wire extends from the terminal block plug. Statement 122
Caution The terminal arrangement on your router may not be identical to the arrangement shown in Figure 18 or Figure 19.
You must connect the positive, negative, and ground wires according to the labels on the terminals.
Caution Do not overtorque the terminal block captive thumbscrew or terminal block contact screws. The recommended
torque is 8.2 ±0.4 in-lb (0.9 ±0.05 N-m).
Table 2 DC Wiring Requirements for Cisco 3620 and Cisco 3640 Routers
DC Power Source DC Input DC Input Wire Size Safety Ground Wire Size Overcurrent Protection
Nominal 48 VDC –48 to –60 VDC1, 4A
1. The input voltage tolerance limits for nominal 48 V power supplies are 38 and 72 VDC.
AWG 14 (2.0 mm2) AWG 14 (2.0 mm2) 15A, maximum

20
Figure 18 DC Power Connections for Cisco 3620 Routers (Typical)
Figure 19 DC Power Connections for Cisco 3640 Routers (Typical)
Step 4 Secure the wires using cable ties.
Step 5 Turn on power to the DC circuit.
Connecting Routers to the Cisco Redundant Power System
If your router uses the Cisco Redundant Power System (RPS), refer to the Cisco RPS Hardware Installation Guide for
instructions about the power connections.To locate these documents, see the “Where to Go Next” section on page 32.
+-
Terminal
block
Negative
H7477
Positive
Ground
On/off
switch
Terminal block
72331
Positive
Negative
Ground
Terminal block On/off switch