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This is a discussion on Cable modem testing within the Modems/Cable/DSL/Satellite forums, part of the Tech Support Forum category. If I were to plug in 10 modems to say Comcast cox line and all 10 lights turn solid ,

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Old 08-18-2017, 01:38 AM   #1
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If I were to plug in 10 modems to say Comcast cox line and all 10 lights turn solid , but when I check on pc via Ethernet 4 of the 10 modems show limited connectivity and the Comcast activation page come and go's.

Does this mean those 4 modems are bad ?

Thanks for any help
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Old 08-18-2017, 02:49 AM   #2
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A little more detail would be helpful, your just testing modems? Are they just Modems, or Modem / Router combos? How old are they? Make and Models.

When you change modems they need to be provisioned with Comcast, you need to link the modems MAC address to your internet service account.

What are the SnR (Signal to Noise Ratios), Upstream Power, Downstream power of the modems?

Her's a link to good power levels for a DOCSIS 3 modem.

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Old 08-18-2017, 05:17 AM   #3
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Just trying to do a simple test and understand why some have limited connectivity and some do not
Are they not provisioned when plug into the cox cable ? All of them there firmware changed or aleast something updated on


Do you know why I get the limited connectivity on 4 units but not the others? Possiblly bad unit or other reason ?
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Old 08-18-2017, 08:46 AM   #4
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Have you compared modem configurations between the working and nonworking? as in how many channels are being used and if you look at the logs what responses the modems are seeing from Comcast
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