Cisco Router DPC3925 User Manual

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 Where Is the Best Location for My DOCSIS Residential Gateway? 
 
Where Is the Best Location for My DOCSIS Residential 
Gateway? 
The ideal location for your residential gateway is where it has access to outlets and 
other devices. Think about the layout of your home or office, and consult with your 
service provider to select the best location for your residential gateway. Read this 
user guide thoroughly before you decide where to place your residential gateway. 
Consider these recommendations: 
 Choose a location close to your computer if you will also use the residential 
gateway for high-speed Internet service. 
 Choose a location that is near an existing RF coaxial connection to eliminate the 
need for an additional RF coaxial outlet. 
 Choose a location for the residential gateway that is adjacent to your telephone 
equipment if you are using only one or two pieces of telephone equipment. 
Note: If you are using the residential gateway to provide service to several 
telephones, a professional installer can connect the residential gateway to your 
existing home telephone wiring. To minimize changes to the home telephone 
wiring, you may want to locate the residential gateway near an existing 
telephone outlet.  
 Choose a location that is relatively protected from accidental disturbance or 
harm, such as a closet, basement, or other protected area. 
 Choose a location so that there is plenty of room to guide the cables away from 
the modem without straining or crimping them. 
 Airflow around the residential gateway should not be restricted. 
 Read this user guide thoroughly before installing the residential gateway. 
  
						

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How Do I Mount the Modem on a Wall? (Optional) 
 
How Do I Mount the Modem on a Wall? (Optional) 
You can mount the residential gateway on a wall using two wall anchors, two 
screws, and the mounting slots located on the unit. The modem can be mounted 
vertically or horizontally.  
Before You Begin 
Before you begin, choose an appropriate mounting place. The wall can be made of 
cement, wood, or drywall. The mounting location should be free of obstructions on 
all sides, and the cables should be able to easily reach the residential gateway 
without strain. Leave sufficient clearance between the bottom of the residential 
gateway and any flooring or shelving underneath to allow access to cabling. In 
addition, leave enough slack in all cables so that the residential gateway can be 
removed for any required maintenance without disconnecting the cables. Also, 
verify that you have the following items: 
 Two wall anchors for #8 x 1-inch screws 
 Two #8 x 1-inch pan head sheet metal screws 
 Drill with a 3/16-in. wood or masonry bit, as appropriate for the wall 
composition 
 A copy of the wall-mounting illustrations shown on the following pages 
Mount the modem as shown in one of the following illustrations. 
  
						

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 How Do I Mount the Modem on a Wall? (Optional) 
 
 
  
Location and Dimensions of the Wall-Mounting Slots 
The following illustration shows the location and dimensions of the wall-mounting 
slots on the bottom of the modem. Use the information on this page as a guide for 
mounting your modem to the wall. 
 
   
						

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How Do I Mount the Modem on a Wall? (Optional) 
 
Mounting the Residential Gateway on a Wall 
1 Using a drill with a 3/16-inch bit, drill two holes at the same height and 4 inches 
apart. 
Note: The preceding graphic illustrates the location of the mounting holes on the 
back of the residential gateway. 
2 Are you mounting the residential gateway into a drywall or concrete surface 
where a wooden stud is available? 
 If yes, go to step 3. 
 If no, drive the anchor bolts into the wall, and install the mounting screws 
into the anchor bolts; leave a gap of about 1/4-inch between the screw head 
and the wall. Then, go to step 4. 
3 Install the mounting screws into the wall; leave a gap of about 1/4-inch between 
the screw head and the wall. Then, go to step 4. 
4 Verify that no cables or wires are connected to the residential gateway. 
5 Lift the residential gateway into position. Slip the large end of both mounting 
slots (located in the back of the residential gateway) over the mounting screws, 
and then slide the residential gateway down until the narrow end of the keyhole 
slot contacts the screw shaft. 
Important: Verify that the mounting screws securely support the residential 
gateway before you release the unit. 
  
						

							4021192 Rev B  25 
 
 What Are the Requirements for Telephone Service? 
 
What Are the Requirements for Telephone Service? 
Number of Telephone Devices 
The RJ-11 telephone-style connectors on the residential gateway can each provide 
telephone service to multiple telephones, fax machines, and analog modems.  
The maximum number of telephone devices connected to each RJ-11 port is limited 
by the total Ringing Load of the telephone devices that are connected. Many 
telephone devices are marked with a Ringer Equivalent Number (REN). Each 
telephone port on the residential gateway can support up to a 5 REN load.  
The sum of the REN load on all of the telephone devices attached to each port must 
not exceed 5 REN.  
Telephone Device Types 
You can use telephone devices that are not labeled with a REN number, but the 
maximum number of attached telephone devices cannot be accurately calculated. 
With telephone devices that are not labeled, each device should be connected and 
the ring signal should be tested before adding more devices. If too many telephone 
devices are attached and the ring signal can no longer be heard, telephone devices 
should be removed until the ring signal works properly. 
Telephones, fax machines, and other telephone devices should use the center 2 pins 
of the RJ-11 connectors to connect to the residential gateway telephone ports. Some 
telephones use other pins on the RJ-11 connectors and require adapters in order to 
work.  
Dialing Requirements 
All your telephones should be set to use DTMF dialing. Pulse dialing is typically not 
enabled by your local provider.  
Telephone Wiring Requirements 
The residential gateway supports connecting to the interior telephone wiring as well 
as connecting directly to a telephone or fax machine. The maximum distance from 
the unit to the most distant telephone device must not exceed 1000 feet (300 meters). 
Use 26-gauge twisted-pair, or larger, telephone wiring. 
Important: Connection to an existing or a new permanently installed home 
telephone wiring network must be done by a qualified installer. 
  
						

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How Do I Connect My Gateway for Internet and Telephone Service? 
 
How Do I Connect My Gateway for Internet and Telephone 
Service? 
You can use your residential gateway to provide both telephone service and to 
provide Internet access, and you can share that Internet connection with other 
Internet devices in your home or office. Sharing one connection among many 
devices is called networking. 
Connecting and Installing Internet Devices 
Professional installation may be available. Contact your local service provider for 
further assistance. 
To connect devices 
The following diagram illustrates one of the various networking options that are 
available to you. 
   
Connecting the Residential Gateway for High-Speed Data and 
Telephone Service 
The following installation procedure ensures proper setup and configuration for the 
residential gateway. 
1 Choose an appropriate and safe location to install the residential gateway (close 
to a power source, an active cable connection, your PC—if using high-speed 
Internet, and your telephone lines—if using VoIP).  
						

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 How Do I Connect My Gateway for Internet and Telephone Service? 
 
  WARNING: 
 To avoid personal injury, follow the installation instructions in the exact 
order shown. 
 To prevent possible damage to equipment, disconnect any other telephone 
service before connecting your cable modem to the same wires. 
 Hazardous electrical voltages can exist on the telephone ports on the 
residential gateway and can be present on any connected wiring including 
Ethernet wiring, telephone wiring and coax cable. 
 Telephone wiring and connections must be properly insulated to prevent 
electrical shock.  
 Telephone connections to an installed home telephone wiring network 
must be done by a qualified installer. The cable telephone service 
provider may offer professional installation and connection to the home 
telephone wiring network. A fee may be charged for this service. 
 Wiring and connections must be properly insulated to prevent electrical 
shock. 
 Disconnect power from the residential gateway before attempting to 
connect to any device. 
2 Power off your PC and other networking device; then, unplug them from the 
power source. 
3 Connect the active RF coaxial cable from your service provider to the coax 
connector labeled CABLE on the back of the residential gateway. 
Note: To connect a TV, DHCT, set-top, or VCR from the same cable connection, 
you will need to install a cable signal splitter (not included). Always check with 
your service provider before using a splitter as a splitter may degrade the signal. 
4 Connect your PC to the residential gateway using either of the following 
methods. 
 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 the yellow ETHERNET port on the back of the residential gateway.  
Note: To install more Ethernet devices than ports provided on the residential 
gateway, use an external multi-port Ethernet switch(s). 
 Wireless: Make sure that your wireless device is powered up. You will need 
to associate your wireless device with the wireless gateway once the gateway 
is operational. Follow the directions provided with your wireless device for 
associating with a wireless access point.  
More information about the factory default configuration of your wireless 
gateway can be found later in this user guide in Configure Wireless Settings 
(on page 38).   
						

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How Do I Connect My Gateway for Internet and Telephone Service? 
 
5 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 
residential gateway. The telephone ports are light gray and are labeled 1/2 and 2 
or 1 and 2 depending on the region of the world the residential gateway is used. 
Notes: 
– Make sure to connect your telephone service to the correct RJ-11 port.  For 
single line telephone service, connect to port 1/2 or 1. 
– In North America, residential gateways have multi-line capability on the 
RJ-11 telephone port labeled 1/2.  Line 1 is on pins 3 and 4 of port 1/2, 
and Line 2 is supported on pins 2 and 5.  In Europe, residential gateways 
support only one line per port.  Line 1 is on port 1 and line 2 is on port 2. 
– Telephones that require electrical connectors other than RJ-11 may 
require an external adapter (sold separately). 
6 Locate the AC power cord provided with your residential gateway. Insert one 
end of the power cord into the AC connector on the back of the residential 
gateway.  Then, plug the AC power cord into an AC outlet to power-up the 
residential gateway. The residential gateway 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 residential gateway stop blinking and 
remain on continuously.  
7 Plug in and power on your PC and other home network devices. The LINK LED 
on the residential gateway corresponding to the connected devices should be on 
or blinking. 
8 Once the residential gateway is online, most Internet devices will have 
immediate Internet access. 
Note: If your PC does not have Internet access, refer to Frequently Asked 
Questions (on page 94) for information on how to configure your PC for TCP/IP.  
For Internet devices other than PCs, refer to the DHCP or IP Address 
configuration section of the User Guide or Operations Manual for those devices. 
  
						

							4021192 Rev B  29 
 
 How Do I Configure My DOCSIS Residential Gateway? 
 
How Do I Configure My DOCSIS Residential Gateway? 
To configure your residential gateway, you must first access the WebWizard 
configuration pages. This section provides detailed instructions and procedures for 
accessing the WebWizard pages and for configuring your residential gateway to 
operate correctly. This section also presents examples and descriptions of each 
WebWizard configuration page. Use the WebWizard pages to customize your 
residential gateway to your needs rather than using the default settings. The 
WebWizard pages in this section are organized in the order shown on the Setup 
page. 
Important: The WebWizard pages and the examples shown in this section are for 
illustration purposes only. Your pages may differ from the pages shown in this 
guide. The pages shown in this guide also represent the default values for the 
device. 
Note: If you are not familiar with the network configuration procedures detailed in 
this section, contact your service provider before you attempt to change any of the 
residential gateway default settings.  
Logging in to the Gateway for the First Time 
The default configuration of the gateway uses IP address 192.168.0.1. If you have 
connected the gateway correctly and you have properly configured your computer, 
use the following steps to log in to the gateway as an administrator. 
1 On your PC, open the web browser that you prefer to use.  
						

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How Do I Configure My DOCSIS Residential Gateway? 
 
2 In the address field, enter the following IP address:  192.168.0.1. A Status DOCSIS 
WAN login page similar to the following page opens.  
 
3 On the Status DOCSIS WAN page, leave the User Name and Password field 
blank and click Log In. The gateway opens with an Administration Management 
page in the forefront. You can use the Administration Management page to 
change your User Name and Password. 
At this point you are logged into the gateway. You can select any of the setup 
and management web pages.  However, you were directed to the Administration 
Management to serve as a reminder to set up a new password. 
Important: We highly recommend that you set up a new password to safeguard 
against the possibility of Internet attacks that look for devices operating with 
well-known or factory default user names and/or passwords.