Forum Discussion

mellusk's avatar
mellusk
New Contributor

CM600 Power Settings

I have Cox Ultimate Internet and have been very pleased.  I had to get my service disconnected about 6 months ago after a flood, but have since had it turned back on.  The speeds that I get are just above 30 Mbps...seems like I should be getting higher speeds than this, because I used to regularly get higher than 85 Mbps.  I've tested this on multiple speed testing sites.

I purchased a new modem thinking that may be the issue, but it doesn't seem to have rectified it.  The modem is a Netgear CM600.  Does anyone know the power specs for this model? I'm wondering if that's where the issue is.  Here's my modem output:

7 Replies

Sort By
Most LikedOldestNewest
Replies have been turned off for this discussion
  • cpljp's avatar
    cpljp
    Contributor

    You're getting a ton of LTE interference into your line, causing you a low SNR for 735 MHz and in turn too many uncorrected packets and speed issues as the end result. Check your line make sure you have no loose connectors and your not using any poorly shielded cable or splitters (such as those you can buy at your local hardware store). After doing this, refresh the page and if its still there, may be worth it to have a tech out

  • ChrisL's avatar
    ChrisL
    Former Moderator
    @mellusk

    The modem is reporting some trouble on one of the channels but still seems to be responding OK. Can you try testing without the router and see what results you get?

  • mellusk's avatar
    mellusk
    New Contributor

    I get the same results when I bypass the router.

    I will try looking at cpljp's suggestion.  I went into the attic last week and didn't see any splitters, but I will do a more thorough search.  I did notice that there are a couple of female-to-female plugs in the line in order to extend the cable length (such as this:  https://www.firefold.com/coax-adapter-coupler).  It's probably a good idea to replace those with a single cable, but I'll still have at least one because the line coming into the house doesn't reach my wall outlet.

    Do you know if Cox can add another wall outlet to my house? Would be nice to move my modem to a different room....

  • cpljp's avatar
    cpljp
    Contributor

    Yes, the less splices you have in the cable, the better. Each splice you add is an additional natural impedance due to the metal mismatch from going from copper clad steel in the coax to whatever metal is inside the barrel splices, but this isn't your issue. Are those all tight splices tight? You can do process of isolation and keep moving the modem closer to the source bypassing more cable each time until you see where your SNR improves to the 40s on those problem channels. 

    Yes Cox will run an additional outlet but there is a cost. 

  • mellusk's avatar
    mellusk
    New Contributor

    Cox sent someone out and he isolated it to the cable coming into the house.  Everything is golden after replacing that one cable.