Troubleshooting; Specifications - D-Link DCM-200 Manual

Docsis 1.1 upgradable usb/ethernet cable modem
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If your USB/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.
Cannot access Internet
or e-mail service.
Status LED indicator
blinks continuously.
LED indicators appear
to be normal but
Internet access can not
be established
The PC Link light is
not green. The light is
The power light is not
Note: If your TV's picture quality is diminished when the USB/Ethernet Cable Modem is in operation, you may
need to contact your Cable TV operator to obtain a High Pass Filter. This should be placed between the
splitter and the TV (or if you have a digital set-top box, between the splitter and the set-top box that
precedes the TV).


Possible Solution
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
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.
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.
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 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.
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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