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RMPondite's avatar
RMPondite
Tutor
Dec 26, 2020

Nighthawk C7000 AC1900 how to test if modem/router vs Comcast issue?

All of our devices, both wired and wireless, are experiencing intermitten short access drops -- wired PC screen won't refresh, wifi Roku has connection delays (though it's just 3ft from router), etc....
Troubleshooting
RMPondite's avatar
RMPondite
Tutor
Dec 27, 2020

I wrote out a response much earlier today but apparently didn't submit it.

 

Thanks for your help! I'm not actually trying to address that the speed is less than what it should be for now, just trying to address the source of the occasional total drops.

 

Here are the screen shots  you requested.

 

 

plemans's avatar
plemans
Guru - Experienced User
Dec 27, 2020

1. we need the event log as it looks at signals long term. you have the router log

2. your speeds are part of it. The C7000 should easily hit >600mbps. If its not able to max out 200mbps, something is wrong. whether that be signal, cmts, the modem itself, or even its internal router, somthing isn't right and it could be the cause of your issues 

  • RMPondite's avatar
    RMPondite
    Tutor
    Dec 27, 2020

    Thank you. Here is the event log, with a lot of "1970" dates?!?

     

     

    • plemans's avatar
      plemans
      Guru - Experienced User
      Dec 27, 2020

      moderators have to approve photos and they can take several days. 

      • RMPondite's avatar
        RMPondite
        Tutor
        Dec 27, 2020

        Didn't realize that there would be a delay if I did screencaps. Here's a straight copy/paste - it looks on my end like the formatting copied ok (went in as table) but let me know if not. :

         

        Time Priority Description
        1970-1-1, 01:41:35Notice (6)Honoring MDD; IP provisioning mode = IPv6
        1970-1-1, 01:36:01Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:35:59Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:28:49Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:28:48Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:24:23Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:24:22Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:18:01Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:55Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:54Critical (3)No UCDs Received - Timeout;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:44Warning (5)Lost MDD Timeout;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:37Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:36Critical (3)No UCDs Received - Timeout;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:26Warning (5)Lost MDD Timeout;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:19Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:18Critical (3)No UCDs Received - Timeout;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:08Warning (5)Lost MDD Timeout;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:17:01Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:16:59Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:10:51Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:10:49Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:04:50Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 01:04:48Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:59:02Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:59:00Warning (5)B-INIT-RNG Failure - Retries exceeded;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:54:12Critical (3)No Ranging Response received - T3 time-out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:54:06Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:53:56Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:53:55Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:00:39Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        1970-1-1, 00:00:39Notice (6)WiFi Interface [wl1] set to Channel 161 (Side-Band Channel:N/A) - Reason:INTERFERENCE
        1970-1-1, 00:00:39Notice (6)WiFi Interface [wl0] set to Channel 11 (Side-Band Channel:N/A) - Reason:INIT
        2020-12-23, 01:19:37Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        2020-12-23, 01:19:37Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
        2020-12-23, 01:19:30Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.1;CM-VER=3.0;
        2020-12-23, 01:18:57Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.1;CM-VER=3.0;
        2020-12-23, 01:18:56Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.1;CM-VER=3.0;
        2020-12-23, 01:18:32Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.1;CM-VER=3.0;
        2020-12-23, 01:18:31Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.1;CM-VER=3.0;
        2020-12-23, 01:18:30Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=2c:30:33:8d:39:38;CMTS-MAC=00:01:5c:8e:3c:6e;CM-QOS=1.1;CM-VER=3.0;