Cisco uBR905 User manual
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Cisco uBR905 Cable Access Router
Hardware Installation Guide
Part Number: OL-0598-01
September 2000
Text Part Number: OL-0598-01
THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT
NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE
PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR
APPLICATION OF ANY PRODUCTS.
THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION
PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO
LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.
The following information is for FCC compliance of Class A devices: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference, in which case users will be required to correct the interference at their own expense.
The following information is for FCC compliance of Class B devices: The equipment described in this manual generates and may radiate radio-frequency
energy. If it is not installed in accordance with Cisco’s 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 B 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.
Modifying the equipment without Cisco’s written authorization may result in the equipment no longer complying with FCC requirements for Class A or
Class B digital devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correct any
interference to radio or television communications at your own expense.
You can determine whether your equipment is causing 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 the equipment and the television or radio
are on circuits controlled by different circuit breakers or fuses.)
Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.
The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of
UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.
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other trademarks mentioned in this document are the property of their respective owners. The use of the word partner does not imply a partnership
relationship between Cisco and any other company. (0005R)
Cisco uBR905 Cable Access Router
Hardware Installation Guide
Copyright © 2000, Cisco Systems, Inc.
All rights reserved.
CONTENTS
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Preface vii
Audience vii
Purpose vii
Organization viii
Conventions ix
Related Documentation xi
Service Provider Publications xii
Subscriber Publications xii
CMTS Hardware Installation Publications xii
Cisco IOS Publications xii
Configuration Editor and Network Management Publications xiii
Obtaining Documentation xiii
World Wide Web xiii
Documentation CD-ROM xiii
Ordering Documentation xiii
Obtaining Technical Assistance xiv
Cisco Connection Online xiv
Technical Assistance Center xiv
Documentation Feedback xv
CHAPTER
1Product Overview 1-1
Overview of the Cisco uBR905 Cable Access Router 1-1
Introduction 1-1
Bridging Operations 1-2
Routing Operations 1-3
Features 1-4
Basic Features 1-4
Configuration Options 1-5
Management Capabilities 1-5
Physical Description 1-5
LED Descriptions 1-7
Data Connectors 1-8
Contents
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Power Supply 1-9
Functional Overview 1-10
Initial Power On and Provisioning 1-10
Initial Power On Sequence 1-11
Provisioning Prerequisites 1-13
Upgrading the Software Image 1-14
Data Operations 1-15
Downstream Transmissions 1-15
Upstream Transmissions 1-16
Security 1-17
CHAPTER
2Preparing for Installation 2-1
Safety 2-1
Warnings and Cautions 2-1
Electrical 2-2
Electrostatic Discharge 2-3
Site Requirements 2-3
Prerequisites 2-4
Environmental 2-5
Power 2-5
CATV Coaxial Cabling 2-5
Interference Considerations 2-6
Coaxial Cable Quality 2-6
Distance Limitations 2-7
Required Tools and Equipment 2-8
CHAPTER
3Installing the Cisco uBR905 Router 3-1
Cisco uBR905 Router Installation Checklist 3-1
Physical Placement 3-3
Verifying Power Requirements 3-3
Connecting to the Cable System 3-4
Connecting the Ethernet Cables 3-5
Connecting Power 3-6
Router Power On and Initialization Sequence 3-8
Verifying Installation 3-9
Contents
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CHAPTER
4Troubleshooting 4-1
Troubleshooting Overview 4-1
Initialization and Self-Test Problems 4-2
Troubleshooting Subsystems 4-4
Power Subsystem 4-6
Coaxial Cable Subsystem 4-7
RF and Digital Subsystem 4-8
PC Subsystem 4-8
Using the Reset Switch 4-10
Further Contacts 4-11
APPENDIX
ATechnical Specifications A-1
Physical, Power, and Environmental Specifications A-1
Data Specifications A-2
APPENDIX
BConnector and Cable Specifications B-1
Coaxial Connector and Cable Specifications B-1
Ethernet Connector and Cabling B-2
Console Port Connector and Cables B-4
APPENDIX
CRegulatory Compliance and Safety Information C-1
If You Need More Information C-1
Service Providers C-1
Subscribers (End Users) C-2
Agency Approvals for the Cisco uBR905 C-2
Safety Information C-2
General Safety C-2
Subscriber Safety C-3
Translated Safety Warnings C-3
Warning Definition C-3
Lightning Activity Warning C-4
Installation Warning C-5
TN Power Warning C-6
Warning Statement for Norway and Sweden C-6
Product Disposal Warning C-6
No On/Off Switch Warning C-7
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Preface
This document, the Cisco uBR905 Cable Access Router Hardware Installation Guide, describes
installing, powering on, and troubleshooting a Cisco uBR905 cable access router. The document also
includes cabling and pinout information.
This section contains:
•Audience
•Purpose
•Organization
•Conventions
•Related Documentation
•Obtaining Documentation
•Obtaining Technical Assistance
Audience
This guide is intended for coaxial networking transmission installers and technicians who are familiar
with the installation, maintenance, and troubleshooting of cable television wiring and equipment. Cable
system installers and technicians should be familiar with their cable plant’s base operating parameters
and subscriber service offerings. Cable system support engineers and administrators should be
acquainted with Ethernet and IEEE 802.3 type data communications networks.
Note This document contains instructions toinstall or configure the Cisco uBR905 cable access
router using procedures that only qualified personnel should perform. This document is
not intended for subscribers. See the “Related Documentation” section of this preface for
the documentation available for subscribers.
Purpose
This guide covers the physical installation of the Cisco uBR905 cable access router. These procedures
include site preparation; the physical placement of the router in an appropriate location; the cabling
required for the power, Ethernet, and cable connections; and verification of the installation at the
router’s initial power on.
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Organization
These procedures do not require a connection to the router’s console port, nor do they require access to
the router’s command-line interface (CLI). However, CLI access might be required to configure the
router and to bring it to full operability. See the Cisco uBR905 Cable Access Router Software
Configuration Guide for instructions on configuring the router for network operation.
Organization
This guide is organized into the following chapters and appendixes:
Table 1 Organization
Chapter Title Description
Chapter 1 Product Overview Describes the Cisco uBR905 cable access router, its
operation, and its interaction with the Cable Modem
Termination System (CMTS).
Chapter 2 Preparing for Installation Outlines site preparation requirements to meet before
installing a Cisco uBR905 cable access router at a
subscriber site. The chapter also discusses safety and
agency considerations.
Chapter 3 Installing theCisco uBR905
Router Provides instructions to connectthe Cisco uBR905 cable
access router, perform its initial power on, and verify its
basic functionality.
Chapter 4 Troubleshooting Contains basic installation troubleshooting information
appropriate to field service technicians. (The
troubleshooting information in this appendix does not
require access to the router’s console port or CLI
interface.)
Appendix A Technical Specifications Contains the physical, environmental, power, and data
technical specifications for the router.
Appendix B Connector and Cable
Specifications Contains the technical description of the interfaces on
the Cisco uBR905 cable access router and the most
common cables that are used with it.
Appendix C Regulatory Compliance and
Safety Information Contains international agency compliance, safety, and
statutory information for the Cisco uBR905 cable access
router. This appendix also contains safety warnings
translated into multiple languages.
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Conventions
Conventions
This document uses the following conventions:
Convention Meaning Comments
Boldface Commands and keywords you
enter literally as shown offset-list
Italics Variables for which you supply
values command type interface
You replace thevariable withthe type
of interface.
In contexts that do not allow italics,
such as online help, arguments are
enclosed in angle brackets (< >).
Square brackets ([ ]) Optional elements command [abc]
abc is optional (not required), but you
can choose it.
Vertical bars ( | ) Separated alternative elements command [ abc | def ]
You can choose either abc or def, or
neither, but not both.
Braces ({ }) Required choices command { abc | def }
You must use either abc or def, but
not both.
Braces and vertical bars
within square brackets
([ { | } ])
A required choice within an
optional element command [ abc { def | ghi } ]
You have three options:
•Nothing
•abc def
•abc ghi
Caret character (^) Control key The key combinations ^D and Ctrl-D
are equivalent: Both mean hold down
the Control key while you press the D
key. Keys are indicated in capital
letters, but are not case sensitive.
A string A nonquoted set of characters For example, when setting an SNMP
community string to public, do not
use quotation marks around the
string; otherwise, the string will
include the quotation marks.
System prompts Denotes interactive sessions,
indicates that the user enters
commands at the prompt
The system prompt indicates the
current command mode. For
example, the prompt
Router (config) # indicates global
configuration mode.
Screen font Terminal sessions and
information the system displays
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Preface
Conventions
Caution Means reader be careful. You are capable of doing something that might result in
equipment damage or loss of data.
Note Means reader take note. Notes contain helpful suggestions or references to materials not
contained in this guide.
Timesaver Means the described action saves time. You can save time by performing the action
described in the paragraph.
Angle brackets (< >) Nonprinting characters such as
passwords
Exclamation points (!) at the
beginning of a line A comment line Comments are sometimes displayed
by the Cisco IOS software.
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
appendix, “Regulatory Compliance and Safety Information” - Translated Safety
Warnings.)
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
aanhangsel “Regulatory Compliance and Safety Information” (Vertalingen van
veiligheidsvoorschriften) raadplegen.)
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
liitteestä "Regulatory Compliance and Safety Information" (käännetyt turvallisuutta
koskevat varoitukset).)
Attention
Ce symbole d’avertissement indique un danger. Vous vous trouvez dans une situation
pouvant entraîner des blessures. Avant d’accéder à cet équipement, soyez conscient
des dangers posés par les circuits électriques et familiarisez-vous avec les
procédures courantes de prévention des accidents. Pour obtenir les traductions des
mises en garde figurant dans cette publication, veuillez consulter l’annexe intitulée «
Regulatory Compliance and Safety Information » (Traduction des avis de sécurité).
Convention Meaning Comments
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Preface
Related Documentation
Related Documentation
Refer to the following Cisco documents for related information. The documents can be found online at
Cisco Connection Online (CCO) or on the Documentation CD-ROM. You can also order printed copies
of most current documents.
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 Anhang mit dem
Titel “Regulatory Compliance and Safety Information” (Übersetzung der
Warnhinweise).)
Avvertenza
Questo simbolo di avvertenza indica un pericolo. Si è in una situazione che può
causare infortuni. 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 nell’appendice, “Regulatory Compliance and Safety
Information” (Traduzione delle avvertenze di sicurezza).
Advarsel
Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til
personskade. Før du utfører arbeid på utstyr, må du være 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 vedlegget "Regulatory Compliance and
Safety Information" [Oversatte sikkerhetsadvarsler].)
Aviso
Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar
danos fisicos. 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 apêndice “Regulatory Compliance
and Safety Information” - “Traduções dos Avisos de Segurança”).
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 traducciones de las advertencias que aparecen en esta
publicación, consultar el apéndice titulado “Regulatory Compliance and Safety
Information.”)
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 förekommer i denna publikation i appendix
"Regulatory Compliance and Safety Information" [Översatta säkerhetsvarningar].)
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Related Documentation
Note The list that follows is not all-inclusive. New documents and revisions occur frequently.
The most current information is always available in the Cisco Product Documentation
section on CCO.
Service Provider Publications
•Cisco uBR905 Cable Access Router Hardware Installation Guide (this manual)
•Cisco uBR905 Cable Access Router Software Configuration Guide
•Cisco uBR905 Cable Access Router Installation and Startup Quick Start Guide
Note Service provider publications for other models of Cisco uBR900 series cable access
routers are also available on CCO.
Subscriber Publications
•Quick Start, Cisco uBR905 Cable Access Router Subscriber Setup
Note Subscriber publications for other models of Cisco uBR900 series cable access routers are
also available on CCO.
CMTS Hardware Installation Publications
•Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
•Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
•Cisco uBR7200 Series Universal Broadband Router Cable Modem Card Installation and
Configuration publication
•Cisco uBR7200 Series Universal Broadband Router Port Adapter Installation and Configuration
publication
•Cisco uBR7200 Series Universal Broadband Router 550-Watt DC-Input Power Supply
Replacement Instructions
•Cisco uBR7200 Series Universal Broadband Router Subchassis and Midplane Replacement
Instructions
•Cisco uBR7200 Series Rack-Mount and Cable-Management Kit Installation Instructions
•Cisco uBR7200 Series Universal Broadband Router Fan Tray Replacement Instructions
•Cisco uBR7200 Series Universal Broadband Router Feature Enhancements publication
Cisco IOS Publications
•Cisco IOS Release 12.1 New Feature Sets documentation for feature module descriptions on
Cisco IOS 121-based releases
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Obtaining Documentation
•Cisco IOS Release 12.1 Configuration Guides and Command References for task and command
descriptions on Cisco IOS 12.1based releases
Note Use the Cisco IOS Release Command Reference Master Indexes to obtain document
pointers for specific software release feature sets and commands that are in the 12.1
mainline release. For information about Early Deployment (ED) releases, see the release
notes that accompany each release.
Configuration Editor and Network Management Publications
•Cisco Cable Configuration Guide for information on the Cisco Network Registrar (CNR) product
•CiscoView: Internetworking Device Monitoring and Management
•CiscoView Incremental Installation Quick Reference Guide
•CiscoWorks documentation for networks that use the Simple Network Management Protocol
(SNMP) to monitor Cisco uBR905 cable access routers
•MIB information is available on CCO at ftp://ftp.cisco.com/pub/mibs and
http://www.cisco.com/public/mibs.
Obtaining Documentation
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com,
http://www-china.cisco.com, or http://www-europe.cisco.com.
Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships with
your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current
than printed documentation. The CD-ROM package is available as a single unit or as an annual
subscription.
Ordering Documentation
Registered CCO users can order the Documentation CD-ROM and other Cisco Product documentation
through our online Subscription Services at http://www.cisco.com/cgi-bin/subcat/kaojump.cgi.
Nonregistered CCO users can order documentation through a local account representative by calling
Cisco’s corporate headquarters (California, USA) at 408 526-4000 or, in North America, call
800 553-NETS (6387).
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Obtaining Technical Assistance
Obtaining Technical Assistance
Cisco provides Cisco ConnectionOnline (CCO) as a starting pointfor all technical assistance. Warranty
or maintenance contract customers can use the Technical Assistance Center. All customers can submit
technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response
card included in many printed documents, or by sending mail to Cisco.
Cisco Connection Online
Cisco continues to revolutionize how business is done on the Internet. Cisco Connection Online is the
foundation of a suite of interactive, networked services that provides immediate, open access to
Cisco information and resources at anytime, from anywhere in the world. This highly integrated
Internet application is a powerful, easy-to-use tool for doing business with Cisco.
CCO’s broad range of features and services helps customers and partners to streamline business
processes and improve productivity. Through CCO, you will find information about Cisco and our
networking solutions, services, and programs. In addition, you can resolve technical issues with online
support services, download and test software packages, and order Cisco learning materials and
merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on CCO to obtain additional personalized information and
services. Registered users may order products, check on the status of an order and view benefits specific
to their relationships with Cisco.
You can access CCO in the following ways:
•WWW: www.cisco.com
•Telnet: cco.cisco.com
•Modem using standard connection rates and the following terminal settings: VT100 emulation;
8 data bits; no parity; and 1 stop bit.
–
From North America, call 408 526-8070
–
From Europe, call 33 1 64 46 40 82
You can e-mail questions about using CCO to cco-team@cisco.com.
Technical Assistance Center
The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract
customers who need technical assistance with a Cisco product that is under warranty or covered by a
maintenance contract.
To display the TAC web site that includes links to technical support information and software upgrades
and for requesting TAC support, use www.cisco.com/techsupport.
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Obtaining Technical Assistance
To contact by e-mail, use one of the following:
In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers
and TAC e-mail addresses worldwide, consult the following web site:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.
Documentation Feedback
If you are reading Cisco product documentation on the World Wide Web, you can submit technical
comments electronically. Click Feedbackin the toolbar and select Documentation. After youcomplete
the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, for your convenience many documents contain a response card
behind the front cover. Otherwise, you can mail your comments to the following address:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883
We appreciate and value your comments.
Language E-mail Address
English tac@cisco.com
Kanji (Japanese) japan-tac@cisco.com
Hangul (Korean) korea-tac@cisco.com
Spanish tac@cisco.com
Thai thai-tac@cisco.com
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Obtaining Technical Assistance
CHAPTER
1-1
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1
Product Overview
This chapter describes the Cisco uBR905 cable access router and its interaction with the Cable Modem
Termination System (CMTS)—the cable system headend equipment that provides Internet (TCP/IP)
connectivity for subscribers over the cable broadband infrastructure. The chapter provides physical and
functional overviews of the Cisco uBR905 cable access router and its supported operating modes.
This chapter provides the following information about the Cisco uBR905 cable access router:
•Overview of the Cisco uBR905 Cable Access Router, page 1-1
•Physical Description, page 1-5
•Functional Overview, page 1-10
For information on configuring the Cisco uBR905 cable access router, see the Cisco uBR905 Cable
Access Router Software Configuration Guide, available on CCO and the Documentation CD-ROM.
Overview of the Cisco uBR905 Cable Access Router
This section provides an overview of the Cisco uBR905 cable access router, its hardware, and its basic
operation:
•Introduction
•Features
Introduction
The Cisco uBR905 cable access router functions at its most basic level as a cable modem—a
modulator/demodulator that provides high-speed network access on the cable television system to
residential and small office/home office (SOHO) subscribers. The Cisco uBR905 router uses the cable
system’s existing physical plant to provide Internet and other wide area network (WAN) connectivity
over the service provider’s Hybrid/Fiber Coax (HFC) cable system.
The router is based on the Data-over-Cable Service Interface Specifications (DOCSIS), a standard
developed with service providers to ensure that any DOCSIS-certified cable modem can interoperate
with any bidirectional, DOCSIS-qualified CMTS. The DOCSIS standard also sets required levels of
performance and reliability for the cable network.
Note Information about DOCSIS requirements and current specifications are available at the
CableLabs web site at http://www.cablelabs.com.
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In this mode, the router operates as an IP bridge between its cable and Ethernet interfaces, performing
the following functions:
•Traffic from the cable interface is sent to the Ethernet ports for transmission to the connected CPE
devices.
•Traffic from the Ethernetports is sentto the cable interface for transmission to the Internet (or other
network) by the gateway at the headend.
In addition to providing DOCSIS connectivity, the Cisco uBR905 router can also function as an IP
router, using static routes and the RIPv2 routing protocol. When operating in routing mode, the
Cisco uBR905 router can optionally provide advanced data and routing features, such as IPsec
encryption.
In both bridging and routing modes, the router can connect one or more computers to the Internet over
the HFC cable system. Subscribers can use the Cisco uBR905 router to create high-speed, permanent
access to the Internet, without the need for telco-based services such as leased lines.
Based on the feature licenses your company purchased, other Cisco IOS images can be downloaded
from Cisco Connection Online (CCO). These images provide additional functionality such as advanced
routing capabilities, firewall protection, and high-security encryption.
For most residential applications that involve basic Internet access, the Cisco uBR905 router is
configured as a bridge. For residential and SOHO applications that involve special feature sets such as
the firewall feature set, or that include connection to an existing network at the site, the Cisco uBR905
is configured as a router.
Bridging and routing operations are summarized in the following sections.
Bridging Operations
When acting as a DOCSIS-compliant cable modem, the Cisco uBR905 router provides DOCSIS IP
bridging for one or more PCs and other customer premises equipment (CPE). The router ships from the
factory with a Cisco IOS software image stored in nonvolatile Flash memory that supports
DOCSIS-compliant bridging data operations.
When installed and configured as a bridge, the Ethernet hub ports at the rear of the Cisco uBR905 router
can be connected directly to PCs at the subscriber site. A maximum of four PCs can be directly
connected to the router’s hub ports, or a maximum of 254 PCs can be connected if one of the four
Ethernet hub ports is connected to a standard 10BaseT Ethernet hub, which then connects to additional
computers (or hubs) at the site.
Regardless of the configuration, Cisco IOS software treats all four Ethernet hub ports as one Ethernet
interface. See Figure 1-1 for a typical configuration.
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Figure 1-1 Cisco uBR905 in a Bridging Configuration
Note For better network performance, Cisco recommends a maximum limit of 16 CPE devices
in either bridging or routing mode. The service provider can also set a different limit by
changing the MAX CPE parameter in the DOCSIS configuration file—the default MAX
CPE value is one CPE device.
Routing Operations
When configured as a router, the Cisco uBR905 can be connected directly to four PCs via the Ethernet
hub ports at the rear of the router. One of the four Ethernet hub ports can also be connected to a standard
10BaseT Ethernet hub, which then connects additional computers or Ethernet devices at the site to a
local area network (LAN). (See Figure 1-2.)
Figure 1-2 Cisco uBR905 in a Routing Configuration
In routing mode, the Cisco uBR905 is typically configured to use the IP address of the headend router
as its default IP gateway. Routing mode does not have a maximum limitation on the number of CPE
devices, as is the case in bridging mode; however, the CMTS can still limit the number of CPE devices
by limiting the number of IP addresses that any particular cable modem can provide services for. If this
is the case, the Cisco uBR905 router can use NAT/PAT translations to use one IP address for multiple
CPE devices.
HFC
network
CATV
coaxial cable
Cisco uBR900 series
cable access router
Ethernet
35570
Ethernet
Ethernet
Ethernet
PC
PC
PC
PC
HFC
network
CATV
coaxial cable Ethernet Ethernet
Hub
35571
Cisco uBR900 series
cable access router
PC
PC
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Overview of the Cisco uBR905 Cable Access Router
Features
This section provides an overview of the Cisco uBR905 cable access router’s features, divided into the
following categories:
•Basic Features
•Configuration Options
•Management Capabilities
Basic Features
The Cisco uBR905 cable access router provides the following features:
•DOCSIS-compliant cable modem that delivers peak data rates of 44 Mbps downstream and 10
Mbps upstream for an always-on connection
•Support for 6-MHz downstream and 200K-3200 KHz upstream cable channel bandwidth
•Comprehensive power-up and CMTS-initiated diagnostic features
•Continuous downstream and upstream channel performance and impairment information gathering
•IP bridging and IP routing using Cisco IOS software
•Other feature sets, such as IPsec encryption or firewall protection, are optionally available,
depending on the Cisco IOS image being used
•Support for an unlimited number of PC and other CPE devices in routing mode (subject to the limits
imposed by the service provider)
•Four-port 10Base T Ethernet hub interface
•Coaxial cable (F-connector) interface
•Support for unicast, broadcast, and multicast IP packets
•Automatic configuration and piracy control provided by:
–
Automatically downloading a DOCSIS configuration file from the headend to configure itself
for operation on the cable network
–
Running resident Cisco IOS image or optionally downloading a new Cisco IOS image as
directed by the CMTS
–
Optionally downloading a Cisco IOS configuration file to configure advanced feature sets
•Support for remote software upgrades without requiring a visit by a cable technician
•Security on the cable interface is provided by the DOCSIS Baseline Privacy Interface (BPI):
–
40-bit or 56-bit DES encryption
–
Automatically established when enabled and supported by both the router and CMTS
–
Encrypts all Ethernet packets transported on the cable interface between the router and CMTS
•Optional end-to-end security provided by IPsec encryption:
–
IPsec hardware accelerator provides high-performance encryption without affecting overall
throughput
–
Provides the capability to create secure virtual private networks (VPNs) across unprotected
networks such as the Internet
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