Cisco Router DPC3208 User Manual

							 
 
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Introduction 
This chapter describes how to maintain and replace the battery that is 
included with the cable modem.   
 
 
4 Chapter 4 
Maintaining the Battery 
In This Chapter 
 Location of the Battery ......................................................................... 28 
 Battery Maintenance ............................................................................. 29  
						

							 
Chapter 4    Maintaining the Battery  
 
 
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Location of the Battery 
The following illustration shows the location of the battery. 
 
  
						

							 
 
 Battery Maintenance 
 
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Battery Maintenance 
If your cable modem contains a battery backup feature, a Lithium-Ion battery 
provides stand-by operation in the event of an AC power failure. You can replace 
the battery without the use of any tools. 
 WARNING: 
Fully charged high-capacity rechargeable batteries should be handled with 
care. Replace only with the battery recommended by the manufacturer. Do not 
disassemble it or attempt to recharge the battery outside the system. Do not 
crush, puncture, dispose of in a fire, short the external contacts, or expose to 
high temperature or immerse in water or other liquids. Dispose of the battery 
in accordance with local regulations and instructions from your service 
provider.  
Charging the Battery 
The battery begins to charge automatically as soon as you attach the cable modem to 
the AC electrical outlet. When you first plug in the cable modem, the POWER LED 
status indicator illuminates. 
Important: It may take as long as 24 hours for the battery to charge fully.  
Removing and Replacing the Battery 
Under normal circumstances, the battery should last for several years. The 
BATTERY LED status indicator turns off to indicate that the battery should be 
replaced soon. Contact your service provider to obtain replacement batteries and for 
disposal instructions. 
Follow these steps to remove and replace the battery. You can remove and replace 
the battery without disconnecting the AC power source. 
1 Turn the cable modem so that you are facing the side with the battery 
compartment. 
2 Gently release the latch to open the battery cover and gain access to the battery 
compartment. 
3 Grasp the plastic strip on the front of the battery and gently slide the battery 
forward to remove it from the battery compartment.  
						

							 
Chapter 4    Maintaining the Battery  
 
 
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4 Insert a new battery into the battery compartment. Do not force the battery into 
the compartment, but be sure to press the battery all the way in until it seats 
fully. 
 
5 Close the battery compartment door. The battery lock will automatically re-
engage. 
Important: Dispose of the battery in accordance with local regulations and 
instructions from your service provider.  
Using the Cable Modem Without a Battery 
If you want, you can use the cable modem without a battery. If you need to remove 
the battery, follow the procedures found in Removing and Replacing the Battery (on 
page 29). 
Important: If you choose to operate your cable modem without a battery, you risk 
losing your telephone service during a power outage. 
  
						

							 
 
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Introduction 
This chapter describes the most common issues that may occur after 
the cable modem is installed and provides possible solutions and tips 
for improved performance of the cable modem.  
 
 
5 Chapter 5 
Troubleshooting the DOCSIS 
Cable Modem 
In This Chapter 
 Frequently Asked Questions ............................................................... 32 
 Common Troubleshooting Issues ....................................................... 37 
 Tips for Improved Performance ......................................................... 39  
						

							 
Chapter 5    Troubleshooting the DOCSIS Cable Modem  
 
 
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Frequently Asked Questions 
This section provides answers to common questions about the cable modem.  
How Do I Configure TCP/IP Protocol? 
To configure TCP/IP protocol, you need to have an Ethernet Network Interface Card 
(NIC) with TCP/IP communications protocol installed on your system. TCP/IP is a 
communications protocol used to access the Internet. This section contains 
instructions for configuring TCP/IP on your Internet devices to operate with the 
cable modem in Microsoft Windows or Macintosh environments. 
TCP/IP protocol in a Microsoft Windows environment is different for each 
operating system. Follow the appropriate instructions in this section for your 
operating system.  
Configuring TCP/IP on Windows 2000 Systems 
1 Click Start, select Settings, and choose Network and Dial-up Connections. 
2 Double-click the Local Area Connection icon in the Network and Dial-up 
Connections window. 
3 Click Properties in the Local Area Connection Status window. 
4 Click Internet Protocol (TCP/IP) in the Local Area Connection Properties 
window, and then click Properties. 
5 Select both Obtain an IP address automatically and Obtain DNS server address 
automatically in the Internet Protocol (TCP/IP) Properties window, and then 
click OK. 
6 Click Yes to restart your computer when the Local Network window opens. The 
computer restarts. The TCP/IP protocol is now configured on your PC, and your 
Ethernet devices are ready for use. 
7 Try to access the Internet. If you cannot access the Internet, contact your service 
provider for further assistance.  
Configuring TCP/IP on Windows XP Systems 
1 Click Start, and depending on your Start menu setup, choose one of the 
following options: 
 If you are using the Windows XP Default Start Menu, select Connect to, 
choose Show all connections, and then go to step 2. 
 If you are using the Windows XP Classic Start Menu, select Settings, choose 
Network Connections, click Local Area Connection, and then go to step 3. 
2 Double-click the Local Area Connection icon in the LAN or High-Speed Internet 
section of the Network Connections window. 
3 Click Properties in the Local Area Connection Status window.  
						

							 
 
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4 Click Internet Protocol (TCP/IP), and then click Properties in the Local Area 
Connection Properties window. 
5 Select both Obtain an IP address automatically and Obtain DNS server address 
automatically in the Internet Protocol (TCP/IP) Properties window, and then 
click OK. 
6 Click Yes to restart your computer when the Local Network window opens. The 
computer restarts. The TCP/IP protocol is now configured on your PC, and your 
Ethernet devices are ready for use. 
7 Try to access the Internet. If you cannot access the Internet, contact your service 
provider for further assistance.  
Configuring TCP/IP on Macintosh Systems 
1 Click the Apple icon in the upper-left corner of the Finder. Scroll down to 
Control Panels, and then click TCP/IP. 
2 Click Edit on the Finder at the top of the screen. Scroll down to the bottom of the 
menu, and then click User Mode. 
3 Click Advanced in the User Mode window, and then click OK. 
4 Click the Up/Down selector arrows located to the right of the Connect Via 
section of the TCP/IP window, and then click Using DHCP Server. 
5 Click Options in the TCP/IP window, and then click Active in the TCP/IP 
Options window. 
Note: Make sure that the Load only when needed option is unchecked. 
6 Verify that the Use 802.3 option located in the upper-right corner of the TCP/IP 
window is unchecked. If there is a check mark in the option, uncheck the option, 
and then click Info in the lower-left corner. 
7 Is there a Hardware Address listed in this window? 
 If yes, click OK. To close the TCP/IP Control Panel window, click File, and 
then scroll down to click Close. You have completed this procedure. 
 If no, you must power off your Macintosh. 
8 With the power off, simultaneously press and hold down the Command 
(Apple), Option, P, and R keys on your keyboard. Keeping those keys pressed 
down, power on your Macintosh but do not release these keys until you hear the 
Apple chime at least three times, then release the keys and let the computer 
restart. 
9 When your computer fully reboots, repeat steps 1 through 7 to verify that all 
TCP/IP settings are correct. If your computer still does not have a Hardware 
Address, contact your authorized Apple dealer or Apple technical support center 
for further assistance.   
						

							 
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How Do I Renew the IP Address on My PC? 
If your PC cannot access the Internet after the cable modem is online, it is possible 
that your PC did not renew its IP address. Follow the appropriate instructions in this 
section for your operating system to renew the IP address on your PC.  
Renewing the IP Address on Windows 7 Systems 
1 Click the Windows Start button. 
2 Type cmd in the Search box. The cmd window opens. 
3 Type ipconfig /renew and press Enter to renew the IP address of the computer.  
Renewing the IP Address on Windows XP Systems 
1 Click Start, and then click Run. The Run window opens. 
2 Type cmd in the Open field and click OK. A window with a command prompt 
opens. 
3 Type ipconfig /release at the C:/ prompt and press Enter. The system releases 
the IP address. 
4 Type ipconfig /renew at the C:/ prompt and press Enter. The system displays a 
new IP address. 
5 Click the X in the upper-right corner of the window to close the Command 
Prompt window. You have completed this procedure. 
Note: If you cannot access the Internet, contact your service provider for further 
assistance.  
Renewing the IP Address on Macintosh Systems 
1 Close all open programs. 
2 Open your Preferences folder. 
3 Drag the tcp/ip preferences file to the Trash. 
4 Close all open windows and empty the Trash. 
5 Restart your computer. 
6 As your computer starts, simultaneously press and hold down the Command 
(Apple), Option, P, and R keys on your keyboard. Keeping those keys pressed 
down, power on your Macintosh but do not release these keys until you hear the 
Apple chime at least three times; then, release the keys and let the computer 
restart. 
7 When your computer fully reboots, click the Apple icon in the upper-left corner 
of the Finder. Scroll down to Control Panels, and then click TCP/IP. 
8 Click Edit on the Finder at the top of the screen. Scroll down to the bottom of the 
menu, and then click User Mode. 
9 Click Advanced in the User Mode window, and then click OK. 
10 Click the Up/Down selector arrows located to the right of the Connect Via 
section of the TCP/IP window, and then click Using DHCP Server.  
						

							 
 
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11 Click Options in the TCP/IP window, and then click Active in the TCP/IP 
Options window. 
Note: In some cases, the Load only when needed option does not appear. If it 
appears, select the option. A check mark appears in the option. 
12 Verify that the Use 802.3 option located in the upper-right corner of the TCP/IP 
window is not selected. If there is a check mark in the option, select the option to 
clear the check mark, and then click Info in the lower-left corner. 
13 Is there a Hardware Address listed in this window? 
 If yes, click OK. To close the TCP/IP Control Panel window, click File, and 
then scroll down to click Close. 
 If no, repeat these instructions from step 6. 
14 Reboot your computer.  
What if I Dont Subscribe to Cable TV? 
If cable TV is available in your area, data service may be made available with or 
without subscribing to cable TV service. Contact your local service provider for 
complete information on cable services, including high-speed Internet access.  
How Do I Arrange for Installation? 
Call your service provider to inquire about professional installation. A professional 
installation ensures proper cable connection to the cable modem and to your PC, and 
it ensures the proper configuration of all hardware and software settings. Contact 
your service provider for more information about installation.  
How Does the Cable Modem Connect to My Computer? 
The cable modem connects to the Ethernet port on your PC. For best performance, 
your PC should be equipped with a Gigabit Ethernet port.  
After My Cable Modem Is Connected, How Do I Access the Internet? 
Your local service provider becomes your Internet Service Provider (ISP). They offer 
a wide range of services including e-mail, chat, news, and information services. Your 
service provider will provide the software you will need.  
Can I Watch TV and Surf the Internet at the Same Time? 
Absolutely! If you subscribe to cable television service, you can watch TV and use 
your cable modem at the same time by connecting your TV and your cable modem 
to the cable network using an optional cable signal splitter.   
						

							 
Chapter 5    Troubleshooting the DOCSIS Cable Modem  
 
 
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Can I Use my Existing Phone Number with the Cable Modem?  
Telephone numbers are portable in some areas. Contact your telephone service 
provider for more information about using an existing telephone number.  
How Many Telephones Can I Connect?  
The RJ-11 telephone-style connectors on the cable modem 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 cable modem 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.