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donawalt's avatar
donawalt
Mentor - Experienced User
Oct 31, 2020

CM1200 - searching for downstream channel

I noticed today my CM1200 cable modem is Blinking green pretty much cinstantly - the manual says it is scanning for a downstream channel.

 

I have never seen this before - what's going on, and is there something I should do?

 

I just did a speed test, all is fine - CM1200 log is clean too.

2 Replies

  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Nov 01, 2020

    Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
    Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
    Be sure your using good quality RG6 coax cable up to the modem. 
    Be sure to power OFF the modem for 1 minute them back ON.
    https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853

    • donawalt's avatar
      donawalt
      Mentor - Experienced User
      Nov 01, 2020

      Thanks for the reply FURRYe38. Since the modem, signals, and logs were clean and have been, I tried the one minute power cycle and it came up fine without blinking. I am testing speeds now just in case. BTW, I noticed inthe restart the logs had two messages I don't recall seeing before, are these anything of concern?

       

      DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=08:36:c9:3e:fd:60;CMTS-MAC=00:01:5c:a2:ae:68;CM-QOS=1.1;CM-VER=3.1;

       

      CM-STATUS message sent. Event Type Code: 5; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:3e:fd:60;CMTS-MAC=00:01:5c:a2:ae:68;CM-QOS=1.1;CM-VER=3.1;