Question about Arris SURFboard SB5120 Modem

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Comcast modem why the pc/activity light always flash?always make me disline

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The light is flashing because your modem is working.

Posted on Dec 09, 2008

  • nhsdfm Aug 17, 2011

    not if it's on all the time without activity and drops the signal. durrrr

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Receive light blinking


First make sure your router is working (can you ping it?)
Open the modem's web page at 192.168.100.1 and check the Status. Also look at the Signal-to-Noise ratio. Check the logs for obvious errors.
Do NOT change any settings if you don't know what your doing!
If you have exchanged the modem, comcast has to know the new MAC address or your modem will not authenticate.

Either post your findings here or call comcast again - there might be an issue with the connection to the outside, since you are (hopefully) getting an IP address on your computer and the modem is powering on.
Question always is: is this your modem or did you lease it from Comcast? If it's theirs, they have to fix it, if it's yours you can call and tell them that internally everything is working.

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Power light - on
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Then your Network Access is OFF - modem is successfuly registered but Network Access Control is disabled via DOCSIS configuration file.

Call your internet service provider....

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