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Sunday, December 27th, 2020

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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. Then a minute later all will be fine. We have had a couple of moments where both wired PCs experienced delays at the same time when we were both just doing mundane browsing so we don't suspect the indiviual devices or wifi interferance. We have 200Mbps service, and typically get around 150 download speed wired, 50 wifi (measured using fast.com) which is usually fine for what we do (just two of us, never more than one movie streaming at a time, no gaming, etc.).

 

I'm trying to figure out how to determine whether this is an issue with the modem/router or with Comcast. All suggestions are much appreciated. I peeked at the logs for the router and didn't know how to make sense of what I was seeing.  The event log has a bunch of things dates 1970 and several "SYNC timing synchronization" errors so I'm guessing that's related! I'll c/p the event log below.

 

FYI

Hardware Version1.05
Firmware VersionV1.01.34
Model: C7000|Nighthawk - AC1900 WiFi Cable Modem Router
 
Event log:
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;
 
 

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