Cisco DPR2320, DPR2325, EPR2320, EPR2325 Installation And Operation Manual
68-4004214-01 Rev D
Model DPR2320, DPR2325, EPR2320,
and EPR2325 Cable Modem Gateways
with Wireless Access Point
Installation and Operation Guide
Please Read
Important
Please read this entire guide. If this guide provides installation or operation
instructions, give particular attention to all safety statements included in this guide.
Notices
Tr ademark Acknowledgements
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its
affiliates in the U.S. and other countries. To view a list of cisco trademarks, go to this
URL: www.cisco.com/go/trademarks.
CableHome, DOCSIS and EuroDOCSIS are trademarks or registered trademarks of
Cable Television Laboratories, Inc.
Other third party trademarks mentioned 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. (1110R)
Publication Disclaimer
Cisco Systems, Inc. assumes no responsibility for errors or omissions that may
appear in this publication. We reserve the right to change this publication at any
time without notice. This document is not to be construed as conferring by
implication, estoppel, or otherwise any license or right under any copyright or
patent, whether or not the use of any information in this document employs an
invention claimed in any existing or later issued patent.
Copyright
© 2003, 2008, 2012 Cisco and/or its affiliates. All rights reserved. Printed in the United
States of America.
Information in this publication is subject to change without notice. No part of this
publication may be reproduced or transmitted in any form, by photocopy,
microfilm, xerography, or any other means, or incorporated into any information
retrieval system, electronic or mechanical, for any purpose, without the express
permission of Cisco Systems, Inc.
IMPORTANT SAFETY INSTRUCTIONS
68-4004214-01 Rev D v
IMPORTANT SAFETY INSTRUCTIONS
Notice to Installers
The servicing instructions in this notice are for use by qualified service personnel only. To reduce the
risk of electric shock, do not perform any servicing other than that contained in the operating
instructions, unless you are qualified to do so.
20070112 SysInstaller 820 English
Notice à l’attention des installateurs de réseaux câblés
Les instructions relatives aux interventions d’entretien, fournies dans la présente notice, s’adressent
exclusivement au personnel technique qualifié. Pour réduire les risques de chocs électriques, n’effectuer
aucune intervention autre que celles décrites dans le mode d'emploi et les instructions relatives au
fonctionnement, à moins que vous ne soyez qualifié pour ce faire.
20070112 SysInstaller 820 French
IMPORTANT SAFETY INSTRUCTIONS
vi 68-4004214-01 Rev D
Mitteilung für CATV-Techniker
Die in dieser Mitteilung aufgeführten Wartungsanweisungen sind ausschließlich für qualifiziertes
Fachpersonal bestimmt. Um die Gefahr eines elektrischen Schlags zu reduzieren, sollten Sie keine
Wartungsarbeiten durchführen, die nicht ausdrücklich in der Bedienungsanleitung aufgeführt sind,
außer Sie sind zur Durchführung solcher Arbeiten qualifiziert.
20070112 SysInstaller 820 German
Aviso a los instaladores de sistemas CATV
Las instrucciones de reparación contenidas en el presente aviso son para uso exclusivo por parte de
personal de mantenimiento cualificado. Con el fin de reducir el riesgo de descarga eléctrica, no realice
ninguna otra operación de reparación distinta a las contenidas en las instrucciones de funcionamiento, a
menos que posea la cualificación necesaria para hacerlo.
20070112 SysInstaller 820 Spanish
IMPORTANT SAFETY INSTRUCTIONS
68-4004214-01 Rev D vii
Read These Instructions
Keep These Instructions
Heed All Warnings
Follow All Instructions
Power Source W arning
A label on this product indicates the correct power source for this product. Operate this product only
from an electrical outlet with the voltage and frequency indicated on the product label. If you are
uncertain of the type of power supply to your home or business, consult your service provider or your
local power company.
The AC inlet on the unit must remain accessible and operable at all times.
Ground the Product
WARNING:
Avoid electric shock and fire hazard! Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two blades with one wider than the
other. A grounding-type plug has two blades and a third grounding prong. The wide
blade or the third prong is provided for your safety. If the provided plug does not fit
into your outlet, consult an electrician for replacement of the obsolete outlet.
If this product connects to coaxial cable wiring, be sure the cable system is grounded (earthed).
Grounding provides some protection against voltage surges and built-up static charges.
Protect the Product from Lightning
For added protection, unplug this apparatus during lightning storms or when unused for long periods
of time. In addition to disconnecting the AC power from the wall outlet, disconnect the signal inputs.
V erify the Power Source from the On/Off Power Light
When the on/off power light is not illuminated, the apparatus may still be connected to the power
source. The light goes out when the apparatus is turned off, regardless of whether it is still plugged into
an AC power source.
Eliminate AC Mains Overloads
WARNING:
Avoid electric shock and fire hazard! Do not overload AC mains, outlets, extension
cords, or integral convenience receptacles. For products that require battery power or
other power sources to operate them, refer to the operating instructions for those
products.
IMPORTANT SAFETY INSTRUCTIONS
viii 68-4004214-01 Rev D
Prevent Power Cord Damage
Protect the power cord from being walked on or pinched, particularly at plugs, convenience
receptacles, and the point where the cord exits from the apparatus.
Provide Ventilation and Select a Location
Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
Do not place this apparatus on a bed, sofa, rug, or similar surface.
Do not place this apparatus on an unstable surface.
Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
Do not install this apparatus in an enclosure, such as a bookcase or rack, unless the installation
provides proper ventilation.
Do not place entertainment devices (such as VCRs or DVDs), lamps, books, vases with liquids, or
other objects on top of this product.
Protect from Exposure to Moisture and Foreign Objects
Do not use this apparatus near water.
WARNING:
Avoid electric shock and fire hazard! Do not expose this product to liquids, rain, or
moisture.
WARNING:
Avoid electric shock and fire hazard! Unplug this product before cleaning. Clean only
with a dry cloth. Do not use a liquid cleaner or an aerosol cleaner. Do not use a
magnetic/static cleaning device (dust remover) to clean this product.
WARNING:
Avoid electric shock and fire hazard! Never push objects through the openings in this
product. Foreign objects can cause electrical shorts that can result in electric shock or
fire.
Accessories Warning
WARNING:
Avoid electric shock and fire hazard! Only use attachments/accessories specified by
your service provider or the manufacturer.
IMPORTANT SAFETY INSTRUCTIONS
68-4004214-01 Rev D ix
Service Warnings
WARNING:
Avoid electric shock! Do not open the cover of this product. Opening or removing the
cover may expose you to dangerous voltages. If you open the cover, your warranty will
be void. This product contains no user-serviceable parts. Refer all servicing to
qualified service personnel.
Servicing is required when the apparatus has been damaged in any way, such as a power-supply cord
or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate normally, or has been dropped.
Check Product Safety
Upon completion of any service or repairs to this product, the service technician must perform safety
checks to determine that this product is in proper operating condition.
Protect the Product When Moving It
Always disconnect the power source when moving the apparatus or connecting or disconnecting
cables.
WARNING:
Avoid personal injury and damage to this product! Use only with the cart, stand,
tripod, bracket, or table specified by the manufacturer or sold with the apparatus.
When a cart is used, use caution when moving the cart / apparatus combination to
avoid injury from tip-over.
20070802 Modem Cable w/out Battery
FCC Compliance
68-4004214-01 Rev D xi
FCC Compliance
United States FCC Compliance
This device has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against such interference in a residential installation. This equipment generates,
uses, and can radiate radio frequency energy. If not installed and used in accordance with the
instructions, it may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television reception, which can be determined by
turning the equipment OFF and ON, the user is encouraged to try to correct the interference
by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
Consult the cable company or an experienced radio/television technician for help.
Any changes or modifications not expressly approved by Cisco, Inc., could void the user's
authority to operate the equipment.
The information shown in the FCC Declaration of Conformity paragraph below is a
requirement of the FCC and is intended to supply you with information regarding the FCC
approval of this device. The phone numbers listed are for FCC-related questions only and not
intended for questions regarding the connection or operation for this device. Please contact your cable
service provider for any questions you may have regarding the operation or installation of this device.
Declaration of Conformity
This device complies with Part 15 of FCC
Rules. Operation is subject to the following two
conditions: 1) the device may not cause
harmful interference, and 2) the device must
accept any interference received, including
interference that may cause undesired
operation.
Cable Modem Gateway with Wireless
Access Point
Models:
DPR2320/DPR2325/EPR2320/EPR2325
Manufactured by:
Cisco Systems, Inc.
5030 Sugarloaf Parkway
Lawrenceville, Georgia 30044 USA
Telephone: 678 277-1120
Canada EMI Regulation
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la class B est conforme à la norme NMB-003 du Canada.
20060628 FCC Standard
FCC Compliance
xii 68-4004214-01 Rev D
FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. To maintain compliance with the FCC RF exposure
guidelines, this equipment should be installed and operated with minimum distance
of at least 7.8 in. (20cm) from all persons.
68-4004214-01 Rev D iii
Contents
IMPORTANT SAFETY INSTRUCTIONS v
FCC Compliance xi
FCC Radiation Exposure Statement .................................................................................... xii
About This Guide v
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320,
and EPR2325 Cable Modem Gateways 1
Cable Modem Gateway Features ........................................................................................... 2
Cable Modem Gateway Components ................................................................................... 4
Theory of Operation ................................................................................................................ 8
Chapter 2 Installing the Cable Modem Gateway for In ter n et
Service 13
Before You Begin .................................................................................................................... 14
Where Is the Best Location for My Cable Modem Gateway? .......................................... 17
How Do I Mount the Cable Modem Gateway on the Wall? ............................................ 18
Configure TCP/IP .................................................................................................................. 20
Install USB Drivers ................................................................................................................ 23
Install the Cable Modem Gateway ...................................................................................... 25
Chapter 3 Basic Configuration 27
Configure Basic Settings ....................................................................................................... 28
Chapter 4 Advanced Features 49
Configure Advanced Features ............................................................................................. 50
Chapter 5 Security 75
Configure Security Settings .................................................................................................. 76
Contents
iv 68-4004214-01 Rev D
Chapter 6 Parental Control 81
Configure Parental Control Settings ................................................................................... 82
Chapter 7 Wireless 91
Configure the Wireless Access Point .................................................................................. 92
Chapter 8 Operating the Cable Modem Gateways 105
WebWizard ........................................................................................................................... 106
Display Basic Cable Modem Gateway Information ........................................................ 109
Display Network Communication Status ........................................................................ 113
Display Cable Modem Operational Status ....................................................................... 114
Display the Cable Modem Log .......................................................................................... 115
Display the Default Webpage ............................................................................................ 116
Display the Scan Page (Frequency Values) ...................................................................... 117
Chapter 9 Troubleshooting the Installation 119
Troubleshooting Overview ................................................................................................. 121
DPR2320 and EPR2320 Front Panel LED Status Indicator Functions .......................... 122
DPR2325 and EPR2325 Front Panel LED Status Indicator Functions .......................... 124
No Downstream Signal Lock ............................................................................................. 126
Ranging Not Complete ....................................................................................................... 128
IP Connectivity Not Complete ........................................................................................... 130
Registration Not Complete ................................................................................................. 132
Having Difficulty? ............................................................................................................... 134
Appendix A Specifications 137
Technical Specifications ...................................................................................................... 138
Appendix B Cable Modem Warranty and RM A Inf or mation 145
Warranty and RMA Information ....................................................................................... 146
About This Guide
68-4004214-01 Rev D v
About This Guide
Introduction
This installation and operation guide applies to the Model DPR2320, DPR2325,
EPR2320, and EPR2325 Cable Modem Gateway with Wireless Access Point (cable
modem gateways). The DPR2320, DPR2325, EPR2320, and EPR2325 offer high-end
performance and unsurpassed reliability at data rates up to three times that of
conventional Data Over Cable System Interface Specifications (DOCSIS) 2.0
(DPR2320/DPR2325) and EuroDOCSIS 2.0 (EPR2320/EPR2325) cable modem
gateways. This guide includes procedures and recommendations for placing,
installing, configuring, operating, and troubleshooting your cable modem gateways.
Scope
This guide also provides the following design, performance, and technical
information for understanding basic cable modem gateway operation and function
to familiarize you with the cable modem gateways:
Design and performance features
Theory of operation for cable modem gateways
Procedures for installing, operating, maintaining, and troubleshooting the cable
modem gateways using the Cable Modem Access Protection and WebWizard
features
Appendixes that includes technical specifications
Note: This guide does not contain installation procedures for cable modem gateway
headend equipment. Consult the documentation supplied with your equipment for
the correct installation procedures.
Purpose
After reading this guide, you will be able to install, operate, maintain, and
troubleshoot the DPR2320, DPR2325, EPR2320, and EPR2325 cable modem
gateways.
Audience
This guide is written for cable service providers, system operators, cable modem
gateway installers, system engineers, customer service representatives, cable modem
gateway marketing personnel, and Cisco Services engineers.
About This Guide
vi 68-4004214-01 Rev D
Document Version
This is the fourth release of this document. This revision supports new models of the
DPR2320, DPR2325, EPR2320, and EPR2325 along with updated product software.
68-4004214-01 Rev D 1
Introduction
The Model DPR2320, DPR2325, EPR2320, and EPR2325 cable modem
gateways are among the fastest cable modems available on the market
today. These cable modem gateways offer high-end performance and
unsurpassed reliability for both home and small office networking.
These cable modem gateways provide broadband network operators
with a cost-effective way to offer high-speed data services to
subscribers. In addition, the cable modem gateways contain a
10/100BASE-T Ethernet port (4 ports on the DPR/EPR2325), a USB 2.0
port, and an 802.11g wireless access point to provide connectivity for
high-speed data wired or wireless services or other Internet devices.
This chapter provides an overview of the outstanding design and
performance features of the cable modem gateways, the front and back
panel components, and a theory of operation for cable modems. This
chapter also provides the requirements for the cable system and the
subscriber’s site.
1 Chapter 1
Introducing the Model
DPR2320, DPR2325, EPR2320,
and EPR2325 Cable Modem
Gateways
In This Chapter
Cable Modem Gateway Features .......................................................... 2
Cable Modem Gateway Components .................................................. 4
Theory of Operation ............................................................................... 8
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320, and EPR2325 Cable Modem Gateways
2 68-4004214-01 Rev D
Cable Modem Gateway Features
This section contains an overview of some of the design and performance features of
the DPR2320, DPR2325, EPR2320, and EPR2325.
Design and Performance Features
The cable modem gateways offer the following additional outstanding design and
performance features:
Provide a high-speed broadband Internet connection that energizes your online
experience, which makes downloading and sharing files and photos with your
family and friends trouble free
Offer a 10/100BASE-T Ethernet port with Auto-negotiate and Auto-MDIX (4
ports on the DPR2325/EPR2325)
Integrated router featuring Network Access Translation (NAT), a Dynamic Host
Configuration Protocol (DHCP) server, and parent control technology
Lockdown mode prevents unauthorized or accidental reset of gateway settings
Include a USB 2.0 data port that is backward compatible with USB 1.1
Support for up to 64 users (1 USB port and up to 63 users on user-supplied
Ethernet hubs)
Utilize freestanding vertical, horizontal, or vertical or horizontal wall-mount
placement
Allow automatic software upgrades by your service provider
Configurable either locally or remotely through the WebWizard interface, the
configuration file, or Simple Network Management Protocol (SNMP)
Provide an 802.11g compliant wireless access point
CableHome 1.1 compliant
Service provider defined CableHome, Residential Gateway (default), or Bridge
modes of operation
Ensure interoperability with most service providers by complying with the
following specifications:
- DPR2320 and DPR2325—DOCSIS 2.0 and backward compatibility for
operation in DOCSIS 1.1 and DOCSIS 1.0 networks
- EPR2320 and EPR2325—EuroDOCSIS 2.0 and backward compatibility for
operation in EuroDOCSIS 1.1 and EuroDOCSIS 1.0 networks
Cable Modem Gateway Features
68-4004214-01 Rev D 3
WebWizard
The cable modem gateways include the WebWizard, a browser-based interface that
facilitates cable modem set up and troubleshooting. The WebWizard verifies set-up
and troubleshooting results and eliminates the need to load additional setup
software on the consumer premise equipment (CPE). In addition, front-panel LED
status indicators provide an informative and easy-to-understand display that
indicates cable modem status along with a visual feedback of real-time data
transmissions and modem operating status.
Note: For more information on the WebWizard feature, see WebWizard
(on page 106).
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320, and EPR2325 Cable Modem Gateways
4 68-4004214-01 Rev D
Cable Modem Gateway Components
DPR2320 and EPR2320 Front Panel LED Status Indicators
The front panel of your cable modem gateway provides LED status indicators that
indicate how well and at what state your cable modem gateway is operating. See
DPR2320 and EPR2320 Front Panel LED Status Indicator Functions (on page 122)
for more information on front panel LED status indicator functions.
1 POWER—Illuminates solid green to indicate that
power is being applied to the cable modem gateway
2 RECEIVE DATA—Blinks to indicate that the cable
modem gateway is receiving data from the cable
network
3 SEND DATA—Blinks to indicate that the cable
modem gateway is sending data to the cable network
4 CABLE—Illuminates solid green when the cable
modem gateway is registered on the network and
fully operational. This indicator blinks to indicate one
of the following conditions:
- The cable modem gateway is booting up and not
ready for data
- The cable modem gateway is scanning the
network and attempting to register
- The cable modem gateway has lost registration
on the network and will continue blinking until it
registers again
5 PC (Ethernet/USB)—Illuminates solid green to
indicate that an Ethernet/USB carrier is present and
blinks to indicate that Ethernet/USB data is being
transferred between the PC and the cable modem
gateway
6 PC (Wireless)—Illuminates solid green to indicate
that a wireless access point is enabled and blinks to
indicate that wireless data is being transferred over
the wireless connection
Note: After the cable modem gateway is successfully
registered on the network, the POWER (LED 1) and
CABLE (LED 4) indicators illuminate continuously to
indicate that the cable modem gateway is online and
fully operational.
Cable Modem Gateway Components
68-4004214-01 Rev D 5
DPR2325 and EPR2325 Front Panel LED Status Indicators
The front panel of your cable modem gateway provides LED status indicators that
indicate how well and at what state your cable modem gateway is operating. See
DPR2325 and EPR2325 Front Panel LED Status Indicator Functions (on page 124)
for more information on front panel LED status indicator functions.
1 POWER—Illuminates solid green to indicate that
power is being applied to the cable modem gateway
2 RECEIVE DATA—Blinks to indicate that the cable
modem gateway is receiving data from the cable
network
3 SEND DATA—Blinks to indicate that the cable
modem gateway is sending data to the cable network
4 CABLE—Illuminates solid green when the cable
modem gateway is registered on the network and
fully operational. This indicator blinks to indicate one
of the following conditions:
- The cable modem gateway is booting up and not
ready for data
- The cable modem gateway is scanning the
network and attempting to register
- The cable modem gateway has lost registration
on the network and will continue blinking until it
registers again
5 ETHERNET (1-4)—Illuminates solid green to
indicate that an Ethernet carrier is present and blinks
to indicate that Ethernet data is being transferred
between the PC and the cable modem gateway
6 USB—Illuminates solid green to indicate that a USB
carrier is present and blinks to indicate that data is
being transferred on a USB connection to the cable
modem gateway
7 Wireless—Illuminates solid green to indicate that a
wireless access point is enabled and blinks to indicate
that wireless data is being transferred over the
wireless connection
Note: After the cable modem gateway is successfully
registered on the network, the POWER (LED 1) and
CABLE (LED 4) indicators illuminate continuously to
indicate that the cable modem gateway is online and
fully operational.
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320, and EPR2325 Cable Modem Gateways
6 68-4004214-01 Rev D
DPR2325 and EPR2325 Back Panel Components
The following illustration shows the description and function of the back panel
components of the DPR2325 and EPR2325 cable modem gateways.
Important: Do not connect your PC to both the Ethernet and USB ports at the same
time. Your Internet service may not function properly if both the Ethernet and USB
ports are connected to the same PC at the same time.
1 ANTENNA—Provides a communication connection for the
built-in wireless access point (WAP) to allow wireless devices
to communicate with the cable modem
2 POWER—Connects the cable modem to the DC output of the
AC power adapter that is provided with your cable modem
CAUTION:
Avoid damage to your equipment. Only use the
AC power adapter that is provided with your cable
modem gateway.
3 RESET—Activating this switch resets the cable modem
gateway to factory default values and reboots the cable
modem gateway
Note: This switch is for maintenance purposes only. Do not
use unless directed to do so by your service provider.
4 ETHERNET—One RJ-45 Ethernet port (on DPR2320 and
EPR2320 modems) or four RJ-45 Ethernet ports (on DPR2325
and EPR2325 modems) connect to the Ethernet port on your
PC or to an Ethernet hub or router on your home network
5 USB—12 Mbps USB port connects to the USB port on your
PC
6 CABLE—F-connector connects to an active cable signal from
your service provider
Cable Modem Gateway Components
68-4004214-01 Rev D 7
DPR2320 and EPR2320 Back Panel Components
The following illustration shows the description and function of the back panel
components of the DPR2320 and EPR2320 cable modem gateways.
Important: Do not connect your PC to both the Ethernet and USB ports at the same
time. Your Internet service may not function properly if both the Ethernet and USB
ports are connected to the same PC at the same time.
1 ANTENNA—Provides a communication connection for the
built-in wireless access point (WAP) to allow wireless
devices to communicate with the cable modem gateway
2 POWER—Connects the cable modem gateway to the DC
output of the AC power adapter that is provided with your
cable modem gateway
CAUTION:
Avoid damage to your equipment. Only use the AC
power adapter that is provided with your cable
modem gateway.
3 RESET—Activating this switch resets the cable modem
gateway to factory default values and reboots the cable
modem gateway
Note: This switch is for maintenance purposes only. Do not
use unless directed to do so by your service provider.
4 ETHERNET—One RJ-45 Ethernet port (on DPR2320 and
EPR2320 modems) or four RJ-45 Ethernet ports (on
DPR2325 and EPR2325 modems) connect to the Ethernet
port on your PC or to an Ethernet hub or router on your
home network
5 USB—12 Mbps USB port connects to the USB port on your
PC
6 CABLE—F-connector connects to an active cable signal
from your service provider
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320, and EPR2325 Cable Modem Gateways
8 68-4004214-01 Rev D
Theory of Operation
This section summarizes the theory of operation for cable modem gateways and
provides a high-level overview of the operational stages for the cable modem
gateway. Reading this chapter provides a better understanding of how cable modem
gateways operate.
Note: This section is not intended to be a specification for the cable modem gateway.
Cable Modem Initialization
A cable modem gateway must establish a communication link with the headend
before it becomes fully operational. This section describes the eight DOCSISrequired operational stages through which a cable modem gateway progresses in
establishing this communication link.
This section provides a detailed explanation of each of the following operational
stages.
1 Scan for Downstream Channel
2 Obtain Upstream Parameters
3 Adjust Timing Offset and Power Level
4 Establish IP Connectivity
5 Establish Time of Day
6 Transfer Operational Parameters
7 Register with the Cable Modem Termination System (CMTS)
8 Initialize Baseline Privacy
Scan for Downstream Channel
When a cable modem gateway powers on, the cable modem gateway starts to scan
the network for the CMTS downstream channel. The downstream channel is the
channel used to send data from the CMTS to the cable modem gateway. The cable
modem gateway identifies a valid downstream data channel as a channel that has
QAM signal timing, forward error correction (FEC) framing, MPEG packets, and
downstream media access control (MAC) messages. The CMTS terminates the cable
modem gateway signal at an upstream location and provides the cable modem
gateway with a network connection.
This section discusses the cable modem gateway downstream scanning routine
along with two features that speed up the downstream scanning process: the Valid
CMTS Frequency Table and the WebWizard Gscan function.
Theory of Operation
68-4004214-01 Rev D 9
Downstream Scanning Routi ne
The cable modem gateway starts its own standard scanning algorithm. The scanning
routine of the cable modem gateway is now optimized to seek out the CMTS
downstream channel as quickly as possible. The actual scanning process varies
slightly depending on the television frequency channel plan for your particular
country.
For example, in North America the standard downstream scanning routine works in
three phases and may take several minutes. The cable modem gateway stops
scanning when the cable modem gateway finds a valid downstream data channel.
The cable modem gateway then proceeds to the next stage: obtain upstream
parameters.
In this example, the cable modem gateway scans for the downstream channel in the
following three phases.
1 The cable modem gateway starts to scan the network at 453 MHz and scans up in
6 MHz increments to end at 855 MHz.
2 The cable modem gateway starts scanning the network at 447 MHz and then
scans in 6 MHz increments down to 93 MHz.
3 The process is then repeated for the National Television Systems Committee
(NTSC) Harmonic Related Carrier (HRC) frequency plan in 6.0003 MHz
increments.
Important: There are specialized frequency plans to optimize the acquisition of the
downstream signal that depend on the video format used in the country of
deployment. Check with the representative who handles your account for more
information about alternate scanning routines outside of North America.
Improved Downstream Scann ing Features
The cable modem gateways contain two outstanding features that can speed up the
scanning process: the Valid CMTS Frequency Table and the WebWizard Gscan
function.
Valid CMTS Frequency Table
The Valid CMTS Frequency Table feature works automatically and requires no user
intervention. When a cable modem gateway finds a valid downstream data channel
so that it can complete the ranging stage, the cable modem gateway stores this
frequency in nonvolatile memory (NVM). The cable modem gateway checks the
frequencies stored in NVM before starting the standard scanning algorithm to search
for a downstream data channel.
Note: The cable modem gateways store up to 10 valid CMTS frequencies in the table.
The standard scanning algorithm also regularly interrupts progressive scanning to
check the last known valid CMTS frequency, and then the cable modem gateway
resumes its standard scanning algorithm where it left off.
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320, and EPR2325 Cable Modem Gateways
10 68-4004214-01 Rev D
WebWizard Gscan Function
When installing a cable modem gateway, you can speed up the process by using the
WebWizard Gscan function. To access the WebWizard Gscan function, you must
first connect a PC to the cable modem. Then, using your Web Browser, you can
access the WebWizard Gscan function.
Note: For more information on the WebWizard Gscan function, see WebWizard
(on page 106).
Obtain Upstream Parameters
After finding a valid downstream data channel, the cable modem gateway reviews
the upstream parameters needed to perform the next stage: ranging and automatic
adjustments. The upstream parameters enable the cable modem gateway to send
data to the CMTS. When the cable modem gateway finds the correct upstream
parameters, the cable modem gateway proceeds to the ranging and automatic
adjustments stage.
If the cable modem gateway cannot find valid upstream parameters, it returns to the
scan for downstream channel stage. Then the cable modem gateway starts to scan
again at the next available channel.
Adjust Timing Offset and Power Level
After the cable modem gateway obtains its upstream parameters, it begins the
ranging and automatic adjustments stage. In this stage, the cable modem gateway
adjusts the timing offset and the power level for communicating with the CMTS.
The cable modem gateway uses MAC messages to determine the upstream channel
frequency and adjusts timing offsets to verify the synchronized timing between the
CMTS and the cable modem gateway. This process also determines the upstream
signal transmit power level from the cable modem gateway to communicate with the
CMTS.
After the cable modem gateway completes the ranging stage and registers with the
CMTS, it repeats this routine regularly to fine-tune the settings established in the
previous stages. These regular adjustments are considered routine maintenance and
do not affect normal operations of your cable modem gateway service.
Note: If the cable modem gateway fails to achieve the proper settings when
performing ranging and automatic adjustments, it terminates the session and restarts
the initialization process at the scan for downstream channel stage.
Theory of Operation
68-4004214-01 Rev D 11
Establish IP Connectivity
After completing the ranging and automatic adjustments stage, the cable modem
gateway attempts to establish Internet Protocol (IP) connectivity. In this stage, the
cable modem gateway obtains network connection information and a cable modem
gateway IP address from provisioning servers that are located on the network side of
the CMTS interface.
The cable modem gateway achieves this connectivity using a protocol called
Dynamic Host Configuration Protocol (DHCP).
Note: If the cable modem gateway fails to establish IP connectivity, it terminates the
session and restarts the initialization process at the scan for downstream channel
stage.
Establish Time of Day
After the cable modem gateway establishes IP connectivity, the cable modem
gateway requests the time of day from the network interface. This stage allows the
cable modem gateway to know the system time so that when the cable modem
gateway logs an event, it associates a time with that event.
Note: The cable modem gateway can operate without establishing the time of day;
however, it logs the failure, generates an alert to simple network management
protocol (SNMP), and then proceeds to the next stage. The cable modem gateway
periodically repeats this stage to attempt to establish the time of day.
Tr ansfer Operational Parameters
After the cable modem gateway requests the time of day, the cable modem gateway
then requests the transfer of the cable modem gateway configuration file. The cable
modem gateway makes the request to the Trivial File Transfer Protocol (TFTP)
server. The configuration file contains parameters for how the system operator
wants the cable modem gateway to function on the cable network.
Typical operation parameters for the cable modem gateway include:
Upstream and downstream rate limits
Specific frequencies
Number of CPE devices
IP filters
Port filters
MAC/LLC filters
Vendor-specific settings
Software version installed
Chapter 1 Introducing the Model DPR2320, DPR2325, EPR2320, and EPR2325 Cable Modem Gateways
12 68-4004214-01 Rev D
Notes:
If the cable modem gateway does not contain the software version requested by
the configuration file, the cable modem gateway requests that software version
from the TFTP server. When the software installation is complete, the cable
modem gateway restarts the entire initialization process again at the scan for
downstream channel stage.
If the system instructs the cable modem gateway to use a different frequency
from what the cable modem gateway is currently using, the cable modem
gateway cannot proceed to the next stage: register with the CMTS. The cable
modem gateway must repeat the scan for downstream channel stage or
reestablish ranging on a new upstream channel.
Register with the CMTS
After the cable modem gateway completes the transfer operational parameters stage,
the cable modem gateway now registers with the CMTS. After the cable modem
gateway receives a reply from the CMTS confirming its registration request, the
cable modem gateway is now authorized to forward network traffic from the CPE.
Initialize Baseline Privacy
Baseline Privacy functions in the CMTS and in the cable modem gateway are used to
encrypt data being transferred to and from the cable modem gateway. Following
registration with the CMTS, if the cable modem gateway is provisioned to run with
baseline privacy, the cable modem gateway must initialize baseline privacy
operations. Using baseline privacy means that all data transferred is secure.
68-4004214-01 Rev D 13
Introduction
This chapter provides information and procedures to assist you in
placing, installing, configuring, operating, and troubleshooting the
DPR2320/DPR2325/EPR2320/EPR2325 for high-speed Internet
service.
2 Chapter 2
Installing the Cable Modem
Gateway for Internet Service
In This Chapter
Before You Begin ................................................................................... 14
Where Is the Best Location for My Cable Modem Gateway? ......... 17
How Do I Mount the Cable Modem Gateway on the Wall? ........... 18
Configure TCP/IP ................................................................................ 20
Install USB Drivers ............................................................................... 23
Install the Cable Modem Gateway ..................................................... 25
Chapter 2 Installing the Cable Modem Gateway for Internet Service
14 68-4004214-01 Rev D
Before You Begin
This section provides the minimum requirements for installing the cable modem
gateways on your system and at user sites.
Cable System Requirements
To allow successful installation and operation, verify that your system meets the
following minimum requirements:
For the DPR2320 and DPR2325: DOCSIS 2.0, 1.1, or 1.0
For the EPR2320 and EPR2325: EuroDOCSIS 2.0, 1.1, or 1.0
Important: This guide does not cover installing cable modem gateway network and
headend equipment on your system. For information on installing network and
headend equipment, refer to the documentation provided with your network and
headend equipment.
Equipment Checklist
Before you install the cable modem gateway, check the items in the carton. The
carton contains the following items, except as noted:
One DPR2320, DPR2325, EPR2320, or EPR2325 cable modem gateway
One Ethernet cable (CAT5/RJ-45)
One USB cable
One AC power adapter
One CD-ROM containing the user’s guide and the USB drivers
Notes:
An additional cable signal splitter and coaxial cable are needed to connect to a
VCR, a digital set-top converter, or a TV to the same cable connection as your
cable modem gateway.
Cables and other equipment needed for telephony service must be purchased
separately.
Loading...