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Page 16 / 78 Scroll up to view Page 11 - 15
B
Installing the Modem • Connecting to the Internet
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
8
570280-001-a
Figure 2 – Cabling the SBG941U
Connecting to the Internet
After installing the modem, check that you can connect to the Internet. You can retrieve
an IP address for your computer’s network interface using one of the following options:
•
Retrieve the statically-defined IP address and DNS address
•
Automatically retrieve the IP address using the Network DHCP server
The modem provides a DHCP server on its LAN. Motorola recommends that you
configure your LAN to obtain the IPs for the LAN and DNS server automatically.
Make sure all computers on your LAN are configured for TCP/IP. After configuring TCP/IP
on your computer, you should verify the IP address.
Note
: For UNIX or Linux systems, follow the instructions in the applicable user
documentation.
Configuring TCP/IP in Windows XP
1.
Open the
Control Panel
.
2.
Double-click
Network Connections
to list the Dial-up and LAN or High-Speed
Internet connections.
3.
Right-click the network connection for your network interface.
Page 17 / 78
B
Installing the Modem • Connecting to the Internet
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
9
570280-001-a
4.
Select
Properties
from the drop-down menu to display the Local Area Connection
Properties window. Be sure Internet Protocol (TCP/IP) is checked.
5.
Select
Internet Protocol (TCP/IP)
and click
Properties
to display the Internet
Protocol (TCP/IP) Properties window.
6.
Select
Obtain an IP address automatically
and
Obtain DNS server address
automatically
.
7.
Click
OK
to save the TCP/IP settings and exit the TCP/IP Properties window.
8.
Close the Local Area Connection Properties window and then exit the Control Panel.
9.
When you complete the TCP/IP configuration, go to
Verifying the IP Address in
Windows XP
.
Configuring TCP/IP in Windows Vista
1.
Open the
Control Panel
.
2.
Double-click
Network and Internet
to display the Network and Internet window.
3.
Double-click
Network and Sharing Center
to display the Network and Sharing
Center window.
4.
Click
Manage network connections
to display the LAN or High-Speed Internet
connections window.
5.
Right-click the network connection for your network interface.
6.
Select
Properties
to display the Local Area Connection Properties window.
Vista may prompt you to allow access to the Network Properties Options. If you see
the prompt,
User Account Control -- Windows needs your permission to
continue
, click
Continue
.
7.
Select
Internet Protocol Version 4 or 6 (TCP/IPv4
or
v6)
and click
Properties
to
display the Internet Protocol Properties window.
8.
Select
Obtain an IP address automatically
and
Obtain DNS server address
automatically
.
9.
Click
OK
to save the TCP/IP settings and close the Internet Protocol Version 4
(TCP/IPv4) Properties window.
10.
Click
OK
to close the Local Area Connection Properties window.
11.
Close the remaining windows and exit the Control Panel.
12.
When you complete the TCP/IP configuration, go to
Verifying the IP Address in
Windows Vista
.
Page 18 / 78
B
Installing the Modem • Connecting to the Internet
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
10
570280-001-a
Verifying the IP Address in Windows XP
To check the IP address:
1.
On the Windows Desktop, click
Start
.
2.
Select
Run
. The Run window is displayed.
3.
Type
cmd
and click
OK.
4.
Type
ipconfig
and press
ENTER
to display your IP configuration.
If an Autoconfiguration IP address is displayed, that indicates possible broadband
network problems or an improper connection between your computer and the SBG941.
The Autoconfiguration IP address, ranging from
169.254.0.0
to
169.254.255.255
, is
reserved for Automatic Private IP Addressing (APIPA).
This can occur if the modem is configured to automatically obtain an IP address from a
Dynamic Host Configuration Protocol (DHCP) server. When Auto-configuration is
enabled, Windows will automatically assign an IP address if the cable modem gateway is
unable to obtain one. Because this automatically assigned IP address is not valid, you will
not be able to access the Internet using the cable modem gateway.
Check the following:
•
Your cable connections
•
Whether you can see cable-TV channels on your television
After successfully verifying your cable connections and proper cable-TV operation, you
can
renew your IP address
.
Verifying the IP Address in Windows Vista
Do the following to verify the IP address:
1.
On the Windows Desktop, click
Start
.
2.
Click
All Programs
.
3.
Click
Accessories
.
4.
Click
Run
to display the Run window.
5.
Type
cmd
and click
OK
to open a command prompt window.
6.
Type
ipconfig
and press
ENTER
to display the IP Configuration.
If an Auto-configuration IP address is displayed, that indicates possible broadband
network problems or an improper connection between your computer and the SBG941.
The Auto-configuration IP address, ranging from
169.254.0.0
to
169.254.255.255
, is
reserved for Automatic Private IP Addressing (APIPA).
Page 19 / 78
B
Installing the Modem • Setting Up a Wi-Fi Network
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
11
570280-001-a
Renewing Your IP Address in Windows XP or Windows Vista
1.
Open a command prompt window.
A.
From the Windows Taskbar, click
Start
to open the Start menu.
B.
Select
Run
to open the Run window.
C.
Type
cmd
in the Open entry box and click
OK
.
2.
Type
ipconfig /renew
and press
ENTER
. A valid IP address should appear
indicating that Internet access is available.
3.
Type
exit
and press
ENTER
to close the command prompt window.
If, after performing this procedure, your computer cannot access the Internet, call your
cable provider for help.
Setting Up a Wi-Fi Network
Do the following to set up a Wi-Fi network using the WPS button on the modem:
1.
If necessary, power on the modem.
2.
Power on the WPS-enabled devices you want to have access to the network, such
as a PC or router.
The Wi-Fi network will automatically detect the WPS devices.
3.
Press
WPS
button on the modem.
4.
If applicable, press
WPS
button on the other WPS devices.
Wall Mounting the Modem
If you choose to wall mount the modem, do the following before starting:
•
Locate the unit as specified by the local or national codes governing residential or
business cable TV and communications services.
•
Follow all local standards for installing a network interface unit/network interface
device (NIU/NID).
•
Make sure the AC power plug is disconnected from the wall outlet and all cables are
removed from the back of the modem before starting the installation.
•
Determine if you are mounting the modem horizontally or vertically.
•
Use M3.5 x 38 mm (#6 x 1½ inch) screws with a flat underside and maximum screw
head diameter of 9.0 mm to mount the modem.
See the screw mounting dimensions below to properly mount the modem:
Page 20 / 78
B
Installing the Modem • Wall Mounting the Modem
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
12
570280-001-a
If possible, mount the modem to concrete, masonry, a wooden stud, or some other solid
wall material. Use anchors if necessary (for example, if you must mount the unit on
drywall).
CAUTION
Before drilling holes, check the structure for potential damage to water, gas, or electrical lines.
1.
Drill the holes to a depth of at least 1½ inches (3.8 cm).
There must be .10 inches (2.5 mm) between the wall and the underside of the screw
head.
2.
After mounting, reconnect the coaxial cable and re-plug the power cord.
3.
Properly route the cables to avoid any safety hazards.
Wall Mounting Template
You can print the following page to use as a wall mounting template.
After mounting the modem, do the following:
1.
Reconnect the coaxial cable input and Ethernet connection.
2.
Plug the power cord into the +12VDC Power connector on the modem and the
electrical outlet.
3.
Arrange the cables appropriately to prevent any safety hazards.

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