Netgear Cm600 High Speed Cable Modem User Manual

							Manage and Monitor 21
 High Speed Cable Modem
Change the Cable Connection Starting Frequency
The starting frequency for the cable connection is automatically generat\
ed. For most Internet 
connections, you do not need to change this information.
WARNING:
Do not change the starting frequency unless your cable Internet 
provider instructs you to do so. Changing the starting frequency 
incorrectly causes serious connection and Internet problems.
To change the starting frequency:
1.  Launch a web browser from a computer that is attached over an Ethernet c\
able to the 
cable modem or from a computer that is connected to a WiFi router that i\
s attached over an 
Ethernet cable t

o the  cable modem.
2.  T
ype  http://192.168.100.1 .
A login window opens.
3.  Enter the cable modem user name and password.
The user name is  admin. 
 The default password is password. The user name and 
password are case-sensitive.
The BASIC Home page displays.
4.  Select  Cable Connection.
5. In the  Starting Frequency field, type a number as instructed by your cable Internet provider. 
						

							Manage and Monitor 
22 High Speed Cable Modem 
WARNING:
Do not change the starting frequency unless your cable Internet 
provider instructs you to do so. Changing the starting frequency 
incorrectly causes serious connection and Internet problems.
6. Click the Apply button.
Your change takes effect. 
						

							23
3
3.   Troubleshooting
This chapter provides information about troubleshooting your cable modem. 
The chapter includes the following sections:
•Use LEDs to Troubleshoot
•Cannot Log In to the Cable Modem
•Troubleshoot the Cable Internet Connection
Note:NETGEAR provides helpful articles and documentation at 
http://support.netgear.com. 
						

							Troubleshooting 24
High Speed Cable Modem 
Use LEDs to Troubleshoot
The following table provides help when you are using the LEDs for troubl\
eshooting.
Table 2.  Troubleshooting with LEDs
 
LED BehaviorAction
All LEDs are off when the cable  modem is plugged in. • 
Make sure that the power cord is properly connected to your cable 
modem and that the power supply adapter is properly connected to a 
functioning power outlet. 
•  Check that you are using the 12 VDC, 1.5A power adapter from 
NETGEAR for this product.
•  If the error persists, a hardware problem occurred. Contact technical 
support.
All LEDs stay on. • Clear the configuration of the cable modem to its factory defaults.
•  If the error persists, a hardware problem occurred. Contact technical 
support.
The Ethernet LED
 is off and a 
powered-on device is connected 
to an Ethernet LAN port. • 
Make sure that the Ethernet cable connections are secure at the cable 
modem and at the computer
, router, or WiFi router.
•  Make sure that power is turned on to the connected hub or computer
 .
•  Be sure that you are using the correct cable.
The Internet LED is off and the  cable modem is connected to 
the cable wall jack. • 
Make sure that the coaxial cable connections are secure at the cable 
modem and at the wall jack.
•  Make sure that your cable Internet provider provisioned your cable 
Internet service. 

Your provider can verify that the signal quality is good 
enough for cable modem service.
•  Remove any excessive splitters that you installed on your cable line. Ru\
n 
a “home run” back to the point where the cable enters your home.
The Power LED lights red
.The cable modem is too warm and might overheat. Do the following: 1. Disconnect the power adapter
 .
2. W
ait a couple of minutes to let the cable modem cool down.
3.Make sure that the cable modem is placed in a vertical position.
4. Make sure that the cable modem is placed in a location with good 
ventilation.
5. Reconnect the power adapter
 . 
						

							Troubleshooting 25
 High Speed Cable Modem
Cannot Log In to the Cable Modem
If you cannot access the cable modem from computer that is connected to \
the cable modem 
or to a router that is connected the cable modem, 
check the following:
• If your computer is connected to the cable modem with an Ethernet cable,\
 check the 
connection.
• Make sure that your computer
 ’s IP address is on the same subnet as the cable modem. 
The IP address of your computer must be in the range of 192.168.100.2 to\
  192.168.100.254.
• Make sure that Java, JavaScript, or 
 ActiveX is enabled in your browser. If you are using 
Internet Explorer, click the  Refresh button to make sure that the Java applet is loaded.
• T
ry quitting the browser and launching it again.
• Make sure that you are using the correct login information. 
 The cable modem user name 
admin  is lowercase (Caps Lock is off). The default password is  password. 
If the cable modem does not save changes you made, do the following:
• When entering configuration settings, be sure to click the  Apply button before moving to 
another page, or your changes are lost. 
• Click the  Refresh or  Reload button in the web browser
 . The changes occurred, but the 
web browser might be caching the old configuration.
Troubleshoot the Cable Internet Connection
If your cable modem cannot access the Internet but the Internet LED ligh\
ts green , make 
sure that the cable MAC address or device MAC address of your cable mode\
m is registered 
with your cable Internet provider (see Install and Activate Your Cable Modem on page  8). 
						

							26
A
A.   Technical Specifications
The following table lists the technical specifications for the cable mod\
em.
Table 3.  Technical specifications 
FeatureSpecification
Power adapter • Input: 1
10–120V, 47–60 Hz
• Output: 12 VDC, 1.5A
Physical specifications • Dimensions: 135.57 x 8.77 x 3.43 in. (135.57 x 222.68 x 87 mm)
•  W
eight: 14.53 oz. (412 g)
Environmental • Operating temperature: 32° to 104°F (0° to 40°C)
•  Operating humidity: 90% maximum relative humidity
 , noncondensing
Interface • Local: 10/100/1000 RJ-45 Gigabit Ethernet port
•  Internet: Coaxial cable connector  
DOCSIS 3.0; backward compatible with DOCSIS 2.0
Memory • 8 MB Flash
•  128 MB RAM
Channels • 24 bonded downstream
•  8 bonded upstream
Certifications • CableLabs certified for U.S. cable Internet services