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DCM-100 Ethernet Cable Modem
5
Troubleshooting
If the Ethernet Cable Modem has been properly set up it is unlikely that you should experience any problems
with it under normal circumstances. However, we list here some possible solutions to problems that you might
experience.
Problem Possible Solution
Cannot access the
Internet or e-mail
service.
Check all connections.
• Make sure the cable TV line and the Ethernet (RJ-45) cable
is securely connected at all points.
• Make sure the AC power adapter is plugged into the device
and the power source. Check the LED indicators to see that
the Power, Link and Status indicators are steadily lit for
an Ethernet-connected device.
Contact your cable service operator to verify that your account is up
to date and that you have two-way service.
There may be a problem with your NIC. Refer to the literature for
the NIC to find a possible solution.
The TCP/IP configuration for the computer may be incorrect.
Double-check to see that these network settings comply with the
instructions given by the cable service operator. Call your cable
company to make sure they have given you the proper settings.
Check your web browser configuration per ISP instruction.
Status LED
indicator blinks
continuously.
Check the cable line connection. If this is secure then there may be a
weak signal coming from the central office. Report the problem to
your cable operator if the cable connection appears to be OK.
LED indicators
appear to be
normal but
Internet access
cannot be
established
Try to establish a new communication with your cable operator’s
central office. This can be accomplished by powering off the
computer and turning it back on.
The TCP/IP configuration for the computer may be incorrect.
The PC Link light
is not green. The
light is off.
The modem is not detecting the Network Interface Card. Make sure
the cables are firmly attached to the network card in the back of
your computer and the modem as well.
Try replacing the Ethernet cable or the network card with known
working components.
Run diagnostic program that came with your network card.
If this is a card that we support, troubleshoot the NIC. Otherwise,
contact the organization that installed or manufacturers the card.
The power light is
not on
Check to make sure the power cable is firmly plugged into the cable
modem. Also, make sure that the power converter is plugged into a
functional socket.
Change outlets with one you know to have power.
Replace Cable Modem.
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