Cisco DPC3925 User manual

DPC 3925 Cable Modem
Quick Start Guide
How to Setup & Secure the
DPC 3925 DOCIS 3.0 Cable Modem

Table of Contents
1. Introduction .................................................................................................................................................... 3
2. Benefits & Features ................................................................................................................................. 4
3. Before You Begin ...................................................................................................................................... 5
4. What’s in the Carton? ............................................................................................................................. 5
5. Front Panel Description ...................................................................................................................... 6
6. Back Panel Description......................................................................................................................... 7
7. How to Setup and Secure the DPC 3925 DOCSIS 3.0 Cable Modem ....... 8
8. Tips for Improved Performance .................................................................................................... 11

Welcome to the exciting world of high-speed Internet and high-quality
digital telephone service. Your new Cisco® Model DPC3925 DOCSIS®
3.0 Wireless Residential Gateway with Embedded Digital Voice Adapter
is a cable modem that meets industry standards for high-speed data
connectivity along with reliable digital telephone service. The DPC3925
residential gateway delivers data, voice and wired (Ethernet) or wireless
gateway capabilities to support high-speed data access and cost-effective
voice services, all in one single device.
Designed for the active digital home or office, the DPC3925 integrated
router features a Dynamic Host Configuration Protocol (DHCP) server.
Network Address and Port Translation (NAT/NAPT) and a Stateful Packet
Inspection (SPI) firewall. These features allow the user to share a single high-
speed public Internet connection as well as share files and folders between
devices within the home network by attaching multiple wired and wireless
devices in the user’s home or office to the wireless residential gateway.
Consumer-friendly features like Wireless Protected Setup (WPS) and user-
configured Parental Control can protect the home network from unwelcome
intruders and family members from access to undesirable websites.
This Quick Start Guide provides procedures and recommendations
for placing, installing, configuring, operating, and troubleshooting your
DPC3925 residential gateway for high-speed Internet and digital telephone
service for your home or office. Refer to the appropriate section in this guide
for the specific information you need for your situation. Contact your service
provider for more information about subscribing to these services.
Introduction

DOCSIS
• Compliant with DOCSIS 3.0, 2.0, 1.1, and 1.0 standards along
with PacketCableTM 1.5, 1.0 specifications to deliver high-end
performance and reliability
Connections
• 1000/100/10BASE-T Ethernet ports to provide wired connectivity
• High performance broadband Internet connectivity to energize
your online experience
• 2.4 GHz 802.11n Wireless Access Point (WAP)
• WPS, including a push-button switch to activate WPS for simplified
and secure wireless setup
• Two-line or single-line RJ-11 telephony ports for connecting to in-
home wiring or directly to conventional telephones or fax
machines
Design and Function
• Quick Links for making home network changes
• Dual colour LEDs provide a user-friendly method to check real-
time operational status
• Attractive, compact design and versatile orientation to stand
vertically, lie flat on the desktop or shelf, or mount easily on a wall
• TR-068 compliant colour-coded interface ports and corresponding
cables simplify installation and setup
Management
• User-configurable Parental Control blocks access to undesirable
internet sites
• Advanced firewall technology deters hackers and protects the
home network from unauthorized access
• Allows automatic software upgrades by your service provider
Benefits and Features

Page 5 of 11
Thank you for Choosing our Broadband Internet Service.
This Guide will help you get connected to your modem
quickly and easily.
When you receive your wireless residential gateway,
you should check the equipment and accessories to verify that each item is in the carton and that
each item is undamaged. The carton contains the following items:
If any of these are missing or damaged, please contact your service provider for assistance.
Note:
 You will need an optional cable signal splitter and additional standard RF coaxial cables if you
want to connect a VCR, a Digital Home Communications Terminal (DHCT) or a set-top converter,
or a TV to the same cable connection as your wireless residential gateway.
 Cables and other equipment needed for telephone service must be purchased separately.
Contact your service provider to inquire about the equipment and cables you need for telephone
service.
Thank you for Choosing our Broadband
Internet Service. This Guide will help you get
connected to your modem
quickly and easily.
When you receive your wireless residential gateway,
you should check the equipment and accessories to verify that each item is in
the carton and that each item is undamaged. The carton contains the following
items:
If any of these are missing or damaged, please contact your service provider
for assistance.
Note:
• You will need an optional cable signal splitter and additional standard RF
coaxial cables if you want to connect a VCR, a Digital Home Communications
Terminal (DHCT) or a set-top converter, or a TV to the same cable connection
as your wireless residential gateway.
• Cables and other equipment needed for telephone service must be
purchased separately. Contact your service provider to inquire about the
equipment and cables you need for telephone service.
Before You Begin
Page 5 of 11
Thank you for Choosing our Broadband Internet Service.
This Guide will help you get connected to your modem
quickly and easily.
When you receive your wireless residential gateway,
you should check the equipment and accessories to verify that each item is in the carton and that
each item is undamaged. The carton contains the following items:
If any of these are missing or damaged, please contact your service provider for assistance.
Note:
 You will need an optional cable signal splitter and additional standard RF coaxial cables if you
want to connect a VCR, a Digital Home Communications Terminal (DHCT) or a set-top converter,
or a TV to the same cable connection as your wireless residential gateway.
 Cables and other equipment needed for telephone service must be purchased separately.
Contact your service provider to inquire about the equipment and cables you need for telephone
service.
Page 5 of 11
Thank you for Choosing our Broadband Internet Service.
This Guide will help you get connected to your modem
quickly and easily.
When you receive your wireless residential gateway,
you should check the equipment and accessories to verify that each item is in the carton and that
each item is undamaged. The carton contains the following items:
If any of these are missing or damaged, please contact your service provider for assistance.
Note:
 You will need an optional cable signal splitter and additional standard RF coaxial cables if you
want to connect a VCR, a Digital Home Communications Terminal (DHCT) or a set-top converter,
or a TV to the same cable connection as your wireless residential gateway.
 Cables and other equipment needed for telephone service must be purchased separately.
Contact your service provider to inquire about the equipment and cables you need for telephone
service.
What’s In the Carton?
One DPC 3925 Residential
Gateway models:
One power adapter
One CD-ROMOne Ethernet cable (CAT5/RJ-45)
Page 5 of 11
Thank you for Choosing our Broadband Internet Service.
This Guide will help you get connected to your modem
quickly and easily.
When you receive your wireless residential gateway,
you should check the equipment and accessories to verify that each item is in the carton and that
each item is undamaged. The carton contains the following items:
If any of these are missing or damaged, please contact your service provider for assistance.
Note:
 You will need an optional cable signal splitter and additional standard RF coaxial cables if you
want to connect a VCR, a Digital Home Communications Terminal (DHCT) or a set-top converter,
or a TV to the same cable connection as your wireless residential gateway.
 Cables and other equipment needed for telephone service must be purchased separately.
Contact your service provider to inquire about the equipment and cables you need for telephone
service.

Page 6 of 11
The front panel of your residential gateway provides LED status indicators that indicate how well and
at what state your residential gateway is operating.
1. POWER – ON, powers is applied to the wireless residential gateway.
2. DS – ON, the wireless residential gateway is receiving data from the cable network
3. US – On, the wireless residential gateway is sending data to the cable network
4. ONLINE – ON, the wireless residential gateway is registered on the network and fully
operational
5. ETHERNET 1 – 4 – ON, a device is connected to one of the Ethernet ports. BLINKING indicates
that data is being transferred over the Ethernet connection
6. WIRELESS LINK – ON, the Wireless Access Point is operational. BLINKING indicates that data is
being trasferred over the wireless connection. OFF indicates that the wireless access point has
been disabled by the user
7. WIRELESS SETUP – OFF (normal condition) wireless setup is not active. BLINKING indicates
the user has activated wireless setup to add new wireless clients on the wireless network
8. TEL1 – ON indicates telephone service is enabled. Blinks when line 1 is in use. OFF indicates
that phone service for TEL1 is not enabled
9. TEL2 – ON indicates telephone service is enabled. Blinks when line 2 is in use. OFF indicates
that phone service for TEL 2 is not enabled.
The front panel of your residential gateway provides LED status indicators that
indicate how well and at what state your residential gateway is operating.
1. POWER – ON, powers is applied to the wireless residential gateway.
2. DS – ON, the wireless residential gateway is receiving data from the cable
network
3. US – On, the wireless residential gateway is sending data to the cable
network
4. ONLINE – ON, the wireless residential gateway is registered on the network
and fully operational
5. ETHERNET 1 – 4 – ON, a device is connected to one of the Ethernet ports.
BLINKING indicates that data is being transferred over the Ethernet
connection
6. WIRELESS LINK – ON, the Wireless Access Point is operational. BLINKING
indicates that data is being trasferred over the wireless connection. OFF
indicates that the wireless access point has been disabled by the user
7. WIRELESS SETUP – OFF (normal condition) wireless setup is not active.
BLINKING indicates the user has activated wireless setup to add new
wireless clients on the wireless network
8. TEL1 – ON indicates telephone service is enabled. Blinks when line 1 is in
use. OFF indicates that phone service for TEL1 is not enabled
9. TEL2 – ON indicates telephone service is enabled. Blinks when line 2 is in
use. OFF indicates that phone service for TEL 2 is not enabled.
Front Panel Description

Page 7 of 11
The following illustrations show the description and function of the back panel components on the
Cisco DPC3925 residential gateway.
1. POWER – Connects the residential gateway to the AC power adapter that is provided with your
residential gateway
2. TELEPHONE 1 AND 2 – RJ-11 telephone ports connect to home telephone wiring to
conventional telephones or fax machines
3. ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on your PC or your home
network
4. CABLE – F-connector connects to an active cable signal from your service provider
5. WIRELESS SETUP – Pressing this switch initiates wireless setup, this feature allows the user to
add new Wireless Protected Setup (WPS) compliant wireless clients to the home network
6. RESET – A momentary pressing (1-2 seconds) of this switch reboots the EMTA. Pressing the
switch for more than ten seconds first causes a reset-to-factory-default of all settings and then
reboots the gateway
The following illustrations show the description and function of the back panel
components on the Cisco DPC3925 residential gateway.
Back Panel Description
1. POWER – Connects the residential gateway to the AC power adapter that
is provided with your residential gateway
2. TELEPHONE 1 AND 2 – RJ-11 telephone ports connect to home telephone
wiring to conventional telephones or fax machines
3. ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on
your PC or your home network
4. CABLE – F-connector connects to an active cable signal from your service
provider
5. WIRELESS SETUP – Pressing this switch initiates wireless setup, this
feature allows the user to add new Wireless Protected Setup (WPS)
compliant wireless clients to the home network
6. RESET – A momentary pressing (1-2 seconds) of this switch reboots the
EMTA. Pressing the switch for more than ten seconds first causes a reset-
to-factory-default of all settings and then reboots the gateway
Page 7 of 11
The following illustrations show the description and function of the back panel components on the
Cisco DPC3925 residential gateway.
1. POWER – Connects the residential gateway to the AC power adapter that is provided with your
residential gateway
2. TELEPHONE 1 AND 2 – RJ-11 telephone ports connect to home telephone wiring to
conventional telephones or fax machines
3. ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on your PC or your home
network
4. CABLE – F-connector connects to an active cable signal from your service provider
5. WIRELESS SETUP – Pressing this switch initiates wireless setup, this feature allows the user to
add new Wireless Protected Setup (WPS) compliant wireless clients to the home network
6. RESET – A momentary pressing (1-2 seconds) of this switch reboots the EMTA. Pressing the
switch for more than ten seconds first causes a reset-to-factory-default of all settings and then
reboots the gateway
Page 7 of 11
The following illustrations show the description and function of the back panel components on the
Cisco DPC3925 residential gateway.
1. POWER – Connects the residential gateway to the AC power adapter that is provided with your
residential gateway
2. TELEPHONE 1 AND 2 – RJ-11 telephone ports connect to home telephone wiring to
conventional telephones or fax machines
3. ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on your PC or your home
network
4. CABLE – F-connector connects to an active cable signal from your service provider
5. WIRELESS SETUP – Pressing this switch initiates wireless setup, this feature allows the user to
add new Wireless Protected Setup (WPS) compliant wireless clients to the home network
6. RESET – A momentary pressing (1-2 seconds) of this switch reboots the EMTA. Pressing the
switch for more than ten seconds first causes a reset-to-factory-default of all settings and then
reboots the gateway
Model DPC3925
CAUTION:
Avoid damage to your equipment. Only use the power supply
that is provided with your residential gateway.
CAUTION:
The Reset button is for maintenance purposes only. Do not use
unless instructed to do so by your cable or telephone service
provider. Doing so may cause you to lose any cable modem
settings you have selected.

How to Setup and Secure the DPC 3925
DOCSIS 3.0 Cable Modem
1. Before setting up the DPC3925 Cable modem, please ensure it is turned
off. Connect the RF coaxial cable from your service provider to the coaxial
connecter labeled “CABLE” on the back of the DPC3925 Cable modem.
2. Connect your PC to the DPC3925 Cable modem using the following
method.
• Ethernet Connection: Locate the yellow Ethernet cable, connect one
end of the Ethernet cable to the Ethernet port on your PC, and connect
the other end to one of the four yellow ETHERNET ports on the back of
the DPC3925 Cable modem.
• WiFi Connection: By default, WiFi access is enabled with WiFi security
disabled. The default SSID Name is the last 6 characters of the CM MAC
Address. The CM MAC Address can be found on the label attached to
the DPC3925 Cable modem or the packaging box.
Note: If your DPC3925 Cable modem comes with a USB port, please note
that all USB functions in the USB port are currently disabled.
Power
Adapter
Home Telephone Wiring
Line 2
Home Telephone Wiring
Line 1
Ethernet
Cable
PCs

3. If you have a Telephone Service with your Service Provider, connect one
end of a telephone jumper cable (not included) to a telephone outlet in your
home or to a telephone or fax machine. Then connect the other end of the
jumper cable to the appropriate RJ-11 TELEPHONE port on the back of the
DPC3925 cable modem.
Notes: Make sure to connect your telephone service to the correct RJ-11
port. For single line telephone service, connect to port 1.
4. Locate the AC power cord provided with your DPC3925 Cable modem.
Insert one end of the power cord into the AC connector on the back of the
DPC3925 Cable modem. Then, plug the AC power cord into an AC outlet
to power-up the DPC3925 Cable modem. The DPC3925 Cable modem
will perform an automatic search to locate and sign on to the broadband
data network. This process may take up to 2-5 minutes. The modem will be
ready for use when the POWER, DS, US and ONLINE LEDs on the front
panel of the DPC3925 Cable modem stop blinking and remain on
continuously.
5. Plug in and power on your PC and other home network devices.
• If you are connecting to the DPC3925 Cable modem via Ethernet
Connection, the LINK LED on the residential gateway corresponding to
the connected devices should be on or blinking. The link LED will be
green color if a 1000BASE-TPC is connected. The link LED will be amber
if a 10/100BASE-TPC is connected.
• If you are connecting to the DPC3925 Cable modem via WiFi Connection,
the WIRELESS LINK LED on the residential gateway should be on or
blinking.
6. Launch Internet Explorer and enter http://192.168.0.1 in the Address\URL
field. You will see the log in page. The default User Name is “admin” and the
default Password is “password”. Click the “Log In” button.

7. Click “QUICK SETUP” under the “SETUP” top menu bar to access to the
quick setup functions.
• To prevent unauthorized access to your DPC3925 Cable modem to
change its settings, it is highly recommended to secure it by changing
the default User Name and Password.
• To prevent unauthorized access to your DPC3925 Cable modem via its
WiFi Connection, it is highly recommended to change the default SSID
Name and enable Wireless Security Mode in your DPC3925 Cable
modem.

Tips for Improved Performance
Check and Correct
If your residential gateway does not perform
as expected, the following tips may help. If you
need further assistance, contact your service
provider.
• Verify that the plug to your residential
gateway AC power is properly inserted into
an electrical outlet.
• Verify that your residential gateway AC
power cord is not plugged into an electrical
outlet that is controlled by a wall switch. If a
wall switch controls the electrical outlet, make
sure the switch is in the ON position.
• Verify that the ONLINE LED status indicator
on the front panel of your residential gateway
is illuminated.
• Verify that your cable service is active and
that it supports two-ways service.
• Verify that all cables are properly connected,
and that you are using the correct cables.
• Verify that your TCP / IP is properly installed
and configured if you are using the Ethernet
connection.
• Verify that you have called your service
provider and given them the serial number
and MAC address of your residential gateway.
• If you are using a cable signal splitter so that
you can connect the residential gateway
to other devices, remove the splitter and
reconnect the cables so that residential
gateway is connected directly to the cable
input. If the residential gateway now
functions properly, the cable signal splitter
may be defective and may need to be
replaced.
• For best performance over an Ethernet
connection, your PC should be equipped
with a Gigabit Ethernet card.