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If the solutions listed here do not solve your problem, contact your service provider.
You may have to reset the SB6121 modem configuration to its original factory settings if
the cable modem is not functioning properly.
Your service provider may ask for the status of the icon lights as described in
Icons and Error
Conditions.
Solutions
MODEM PROBLEM
Power Icon is OFF
Cannot Send or
Receive Data
Troubleshooting • Solutions
SB6121 DOCSIS 3.0® Cable Modem • Installation Guide
Uncontrolled Document
Table 1 – Troubleshooting Solutions
POSSIBLE SOLUTION
•
Check that the SB6121 is properly plugged into the
electrical wall outlet.
•
Check that the electrical outlet is working.
•
Check that the Energy Conservation switch
(pushed in).
•
On the front panel, note the status of the icons and refer
to
Front Panel Icons and Error Conditions
error.
•
If you have cable television, check your television to
ensure your cable service is operating properly.
•
Check the coaxial cable connection at the SB6121 and
cable wall outlet. Hand-tighten if necessary.
•
Check the IP address. Follow the steps for verifying the IP
address for your system described in
Call your service provider if you need an IP address.
•
Check that the Ethernet cable is properly connected to the
SB6121 and the computer.
•
If a device is connected via the Ethernet port, check that
the ONLINE icon is ON to verify connectivity.
•
Call your service provider for further assistance.
Troubleshooting
to identify the
Configuring
B
Front Panel
is ON
TCP/IP.
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