22 DOCSIS 1.0 Cable Modem User Guide Rev. 3.0
Appendix B: Questions and Answers
Section 1: Troubleshooting Modem LED Problems
Troubleshooting the modem portion of this Cable Modem begins with observing the front panel lights (also called LEDs - light emitting diodes).
The pattern of these lights indicates the status of the modem. Interpreting the pattern correctly can indicate whether the modem is functioning
properly or not. If there is a problem, the lights provide clues as to what the problem might be. The Cable Modem does not require any routine
maintenance. If you cannot identify and correct a fault using these troubleshooting procedures, please contact your cable television (CATV)
Internet Service Provider (ISP).
Question 1: The Power Light Is Off
Answer:
The normal state for this light is solid red. If the Power light is off, then the modem is not receiving power. Possible Solutions:
1. Check to make sure the power cable is firmly plugged into both the cable modem and the electrical outlet. Try unplugging, then reconnecting
the cable at each end.
2. Check that the wall outlet is working. Test it by using a light or some other device in the suspect outlet.
3. If the power light remains off, the external power supply or the power cord is probably defective. Contact the supplier of the Cable Modem for
assistance.
Question 2: The Cable Light Is Off
Answer:
The normal state for this light is solid green. If the Cable Light Is Off, then the modem is not detecting the downstream radio frequency (RF)
signal provided by the cable network. This could be caused by any of the following:
• Radio frequency noise in the home
• Damaged cable
Summary of Contents for CMX300
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