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Netgear Cm1000 Ultra High Speed Cable Modem Docsis 3 1 Ready User Manual

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    							Manage and Monitor 
    21  High Speed Cable Modem
    6. Click the Apply button.
    Your change takes effect. 
    						
    							22
    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 
    support.netgear.com. 
    						
    							Troubleshooting 23
     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, 2.5A 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 extra splitters that you installed on your cable line. Run 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 
    24 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.
    •Try 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 lights green, make sure 
    that the cable MAC address or device MAC address of your cable modem is registered with 
    your cable Internet provider (see 
    Install and Activate Your Cable Modem on page 8). 
    						
    							25
    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, 2.5A
    Physical specifications • Dimensions: 5.90 x 8.77 x 3.43 in. (149.76 x 222.68 x 87 mm)
    •  W
    eight: 0.84 lb (380 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 3.1; backward compatible with DOCSIS 3.0
    Memory • 128 MB Flash
    •  256 MB RAM
    Channels • 2 OFDM and 32 SC-QAM bonded downstream 
    •  2 OFDMA and 8 SC-QAM bonded upstream
    Certifications • CableLabs DOCSIS certified for U.S. cable Internet services
    •  FCC/UL 
    						
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