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Miketune's avatar
Miketune
Aspirant
Feb 19, 2017

CM1000 Modem Locks on Only Half the Channels

My 2-week old CM1000 modem (Comcast) self-installed as advertised - no call to Comcast.  Quite a pleasant surprise for me. 

 

I noticed, however, it is locked on only 16 channels down and 4 up, half of what the modem is supposed to do.   I have Blast 200 and it downloads about 230 Mbps, 12 up.  No complaints.

 

Anyone know why it's locking on only half the available channels?  After all, it is DOCSIS 3.1. rated at 32 down and 8 up.   I found no settings on the Genie. 

Hardware

3 Replies

  • TheEther's avatar
    TheEther
    Guru
    Feb 19, 2017

    It's possible that the cable plant you are connected to only supports 16 channels.  There is a super long thread on dslreports.com where people are self-reporting the number of channels in their area (link).

    • Miketune's avatar
      Miketune
      Aspirant
      Feb 21, 2017

      Hello,  

       

      You are probably right.  The modem is working fine and is properly bonding the number of channels the IP is throwing at it.  I live in northern Vermont and DSL online report has no Vermont entriy  Thank you for the help.

  • vkdelta's avatar
    vkdelta
    NETGEAR Employee Retired
    Feb 21, 2017

    how many channels supported are in control of Comcast CMTS and RF plant configuration. Cable modem just bonds what it was provided. Most likely, your area CMTS has only 16 channels enabled. Comcast has only handful of 32 bonding areas and  quite a few 24 channels area.  If you are part of  areas where new things happen very late, thats probably reason why you are still on 16x4 bonding.