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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
Introduction
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 highspeed 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 userconfigured 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.
Benefits and Features
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
Before You Begin
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What’s In the Carton?
When you
receive
your
wireless
residential
gateway,
When
When you
you receive
receive your
your wireless
wireless residential
residential gateway,
gateway,
you
check
the
equipment
accessories
to
item
is
carton
and
that
you should
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the
accessories
to each
verify
each
item
in
you should
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andand
accessories
to verify
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that
each
itemthat
is in
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andis
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When
youitem
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wireless
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is
undamaged.
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contains
When
youeach
receive
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the
carton
and
each
item
is gateway,
undamaged.
The carton
each
itemyour
isthat
undamaged.
The carton
carton
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the following
items: contains the following
you should
check
the equipment
and accessories
to verify
incarton
the carton
and that
you should
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and accessories
to verify
that that
eacheach
itemitem
is in is
the
and that
items:
each item is undamaged. The carton contains the following items:
each item is undamaged. The carton contains the following items:
One DPC 3925 Residential
Gateway models:
One Ethernet cable (CAT5/RJ-45)
One power adapter
One CD-ROM
If
If any
any of
of these
these are
are missing
missing or
or damaged,
damaged, please
please contact
contact your
your service
service provider
provider for
for assistance.
assistance.
If any of these are missing or damaged, please contact your service provider
any
of these
are missing
or damaged,
please
contact
service
provider
for assistance.
Iffor
anyIfassistance.
of
these
are missing
or damaged,
please
contact
youryour
service
provider
for assistance.
Note:
Note:
 You will need an optional cable signal splitter and additional standard RF coaxial cables if you
Note: You will need an optional cable signal splitter and additional standard RF coaxial cables if you
Note:
want
to
aa VCR,
aa Digital
Home
Terminal
(DHCT) or
aa set-top
converter,
Note:
want
to connect
connect
VCR,
Digital
Home Communications
Communications
Terminal
or
set-top
Youneed
will
need
anthe
optional
cable
signal
splitter
and additional
standard
RF(DHCT)
coaxial
cables
if youconverter,
• You
an optional
cable
signal
splitter
and
additional
standard
RF coaxial
cables
if you
or
a
TV
to
same
cable
connection
as
your
wireless
residential
gateway.
Youwillwill
need
an
optional
cable
signal
splitter
and
additional
standard
RF
or
TV to the
sameacable
connection
as your wirelessTerminal
residential
gateway.
want
toaconnect
a VCR,
Digital
Home
Communications
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a set-top
converter,
to connect
a VCR,
a Digital
Home
Communications
(DHCT)
or a or
set-top
converter,
want
coaxial
cables
if you
want
to connect
a VCR,Terminal
a Digital
Home
Communications
or atoTV
tosame
the same
cable
connection
as your
wireless
residential
gateway.
or
a
TV
the
cable
connection
as
your
wireless
residential
gateway.
 Cables
and
equipment
for
service
must
be
Terminal
(DHCT)
or a
set-topneeded
converter,
or a TV
to the
same
cable separately.
connection
Cables
and other
other
equipment
needed
for telephone
telephone
service
must
be purchased
purchased
separately.
Contact
your
service
provider
to
inquire
about
the
and
cables
need
as your
wireless
residential
gateway.
Contact
yourequipment
service
provider
tofor
inquire
about service
the equipment
equipment
and
cables you
you
need for
for telephone
telephone
Cables
and
other
needed
telephone
must
be
purchased
separately.
 Cables and
other equipment needed for telephone service must be purchased separately.
service.
service.
Contact
service
provider
to inquire
about
the equipment
and cables
you need
for telephone
Contact
youryour
service
provider
to inquire
about
the equipment
and cables
you need
for telephone
• Cables
service.and other equipment needed for telephone service must be
service.
purchased separately. Contact your service provider to inquire about the
equipment and cables you need for telephone service.
Page 5 o
Page 5 o
5 of 11
PagePage
5 of 11
Front Panel Description
The
frontpanel
panel
of your
residential
gateway
provides
LED
status
indicators
The front
of your
residential
gateway provides
LED status
indicators
that
indicate
how well andthat
indicate
how
well
and atgateway
what isstate
your residential gateway is operating.
at what state
your
residential
operating.
POWER – ON,
powers
is applied
the wireless
residential
gateway.
1.1. POWER
– ON,
powers
is to
applied
to the
wireless
residential gateway.
DS ––ON,
wireless
residential
gateway is gateway
receiving data
the cabledata
network
2.2. DS
ON,thethe
wireless
residential
is from
receiving
from the cable
network
3.
US – On, the wireless residential gateway is sending data to the cable network
3. US – On, the wireless residential gateway is sending data to the cable
ONLINE – ON, the wireless residential gateway is registered on the network and fully
4. network
operational
4. ONLINE – ON, the wireless residential gateway is registered on the network
5. ETHERNET 1 – 4 – ON, a device is connected to one of the Ethernet ports. BLINKING indicates
and
fully operational
that data is being transferred over the Ethernet connection
5.6. ETHERNET
1––ON,
4 the
– ON,
a device
is connected
one of indicates
the Ethernet
WIRELESS LINK
Wireless
Access Point
is operational.toBLINKING
that dataports.
is
BLINKING
indicates
that data
is being
over
the access
Ethernet
being trasferred
over the wireless
connection.
OFFtransferred
indicates that the
wireless
point has
connection
been disabled by the user
6.7. WIRELESS
LINK
– ON,
thecondition)
Wireless
Access
Point
is operational.
BLINKING
WIRELESS SETUP
– OFF
(normal
wireless
setup is
not active.
BLINKING indicates
indicates
datawireless
is being
over the
wireless
connection.
OFF
the user hasthat
activated
setuptrasferred
to add new wireless
clients
on the wireless
network
indicates that the wireless access point has been disabled by the user
8.
TEL1 – ON indicates telephone service is enabled. Blinks when line 1 is in use. OFF indicates
that phone service
for TEL1–isOFF
not enabled
7. WIRELESS
SETUP
(normal condition) wireless setup is not active.
BLINKING indicates the user has activated wireless setup to add new
TEL2 – ONclients
indicateson
telephone
service is enabled.
Blinks when line 2 is in use. OFF indicates
9. wireless
the wireless
network
that phone service for TEL 2 is not enabled.
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.
Page 6 of 11
Back Panel Description
The following
illustrations
show the
description
and function of the
back
panel components
on thepanel
The
following
illustrations
show
the description
and
function
of the back
The following illustrations show the description and function of the back panel components on the
Cisco DPC3925 residential
gateway.DPC3925 residential gateway.
components
on
the
Cisco
Cisco DPC3925 residential gateway.
Model DPC3925
1.1. POWER
– Connects
the residential
gateway
the AC
adapter
POWER – Connects
the residential
gateway to the
AC powerto
adapter
that power
is provided
with yourthat
1. POWER
– Connects
theyour
residential
gateway to
the AC power adapter that is provided with your
isresidential
provided
with
residential
gateway
gateway
residential gateway
CAUTION:
Avoid damage to your equipment. Only use the power supply
that is provided
with your
residential
gateway.
The following illustrations
show the description
and function
of the back
panel components on the
2. TELEPHONE 1 AND 2 – RJ-11 telephone ports connect to home telephone wiring to
Cisco
DPC3925 residential
2. TELEPHONE
1 AND 2gateway.
– RJ-11 telephone ports connect to home telephone wiring to
conventional telephones or fax machines
telephones
or fax2machines
2. conventional
TELEPHONE
1 AND
– RJ-11 telephone ports connect to home telephone
3. wiring
to conventional
telephones
or fax
machines
ETHERNET
– Four RJ-45 Ethernet
ports connect
to the
Ethernet port on your PC or your home
3. ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on your PC or your home
network
3. network
ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on
4. your
PC
or your home
network
CABLE
– F-connector
connects
to an active cable signal from your service provider
4. CABLE – F-connector connects to an active cable signal from your service provider
WIRELESS
– Pressing connects
this switch initiates
thissignal
feature from
allows your
the user
to
4.5. CABLE
– SETUP
F-connector
to anwireless
activesetup,
cable
service
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
provider
add new Wireless Protected Setup (WPS) compliant wireless clients to the home network
5. WIRELESS SETUP – Pressing this switch initiates wireless setup, this
feature– Connects
allows the
user to gateway
add new
Wireless
POWER
the residential
to the
AC power Protected
adapter that isSetup
provided(WPS)
with your
residential
compliant
wireless clients to the home network
gateway
1.
CAUTION:
Resetpressing
button(1-2
is seconds)
for maintenance
purposes
only.Pressing
Do nottheuse
6. RESET – AThe
momentary
of this switch reboots
the EMTA.
6. RESET – A momentary
pressing (1-2to
seconds)
thisyour
switchcable
rebootsor
thetelephone
EMTA. Pressing
the
unless
do
soofaby
service
switch for more
thaninstructed
ten seconds first
causes
reset-to-factory-default
of all settings
and then
switch for more
than
ten
seconds
first
causes
a
reset-to-factory-default
of
all
settings
and
then
2. TELEPHONE
1
AND
2
–
RJ-11
telephone
ports
connect
to
home
telephone
wiring
to
reboots theprovider.
gateway Doing so may cause you to lose any cable modem
reboots the gateway
conventional
telephones or fax machines
settings you have selected.
3.
ETHERNET – Four RJ-45 Ethernet ports connect to the Ethernet port on your PC or your home
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. network
RESET – A momentary pressing (1-2 seconds) of this switch reboots the
EMTA. Pressing the switch for more than ten seconds first causes a resetto-factory-default
of alltosettings
and signal
thenfrom
reboots
the gateway
4. CABLE
– F-connector connects
an active cable
your service
provider
Page 7 of 11
Page 7 of 11
How to Setup and Secure the DPC 3925
DOCSIS 3.0 Cable Modem
Power
Adapter
Home Telephone Wiring
Line 2
Ethernet
Cable
PCs
Home Telephone Wiring
Line 1
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.
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.
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