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Christian07's avatar
Christian07
Follower
Aug 12, 2016

C3000 Constantly dropping connection

My internet connection has been constantly dropping out for some time now. I've called my ISP (Cox in southern AZ) and "all looks good on their end" according to all CSreps I've spoken with. At this point I'm clueless as to what the issue is. My modem is connected directly to the wall, and my desktop (Windows 10) is connected via ethernet cable. Here's my most recent event logs. Any help would be appreciated. 

 

 
 
 
 
TimePriorityDescription
2016-8-4, 15:24:05Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 15:35:05Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 15:37:24Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 15:37:27Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:33:42Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:36:08Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:36:14Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:36:47Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:38:29Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:39:18Critical (3)No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-4, 16:39:59Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:32Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:39Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:32Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2016-8-7, 13:24:12Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:33:39Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:51:53Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:51:59Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:14Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:15Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:30Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:31Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:44Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:46Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:53:59Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 13:54:05Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2016-8-7, 14:04:48Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2016-8-7, 14:04:49Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2016-8-7, 14:06:16Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-7, 14:51:35Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:31Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:37Critical (3)No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.0;CM-VER=3.0;
2016-8-10, 17:26:54Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:31Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:34Notice (6)WiFi Interface [wl0] set to Channel 9 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:38Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:41Notice (6)Honoring MDD; IP provisioning mode = IPv4
1970-1-1, 00:00:43Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.0;CM-VER=3.0;
2016-8-10, 17:41:52Notice (6)TLV-11 - unrecognized OID;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;
2016-8-10, 19:02:52Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:70:d0:90;CMTS-MAC=00:12:d9:54:39:4b;CM-QOS=1.1;CM-VER=3.0;

 

Troubleshooting

1 Reply

  • DarrenM's avatar
    DarrenM
    Sr. NETGEAR Moderator
    Aug 16, 2016

    Hello Christian07

     

    I would try to remove any cable splitters you have connected to the modem to make sure you are getting the best connection make sure all the cords are tight. You may also want and try to move the modem to another active cable outlet to test if that outlet is bad. If all that fails I would call COX and have them send a tech out to test everything.

     

    DarrenM