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DukerOfHazzard's avatar
DukerOfHazzard
Aspirant
Feb 17, 2021
Solved

CM500 signal keeps dropping

Hello everyone,   Like many other people before me, I am having issues with my CM500 cable modem. It will drop signal randomly for periods of the day; sometimes correcting itself quickly, other tim...
  • plemans's avatar
    plemans
    Feb 17, 2021

    You're getting a lot of timeouts. Thats when the modem isn't connecting back to the cmts. Tends to be line issues. 

    You can check your side of the line again for kinks, damage, loose/old/bad/corroded connectors. If you can't find anything, the isp needs to check the line 

DukerOfHazzard's avatar
DukerOfHazzard
Aspirant
Feb 17, 2021
Time Priority Description
1970-1-1, 00:01:47Notice (6)Honoring MDD; IP provisioning mode = IPv6
1970-1-1, 00:00:28Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:22Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-2-16, 19:38:00Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:10:25Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:10:24Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:10:24Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:10:05Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:10:05Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:10:05Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 19:08:56Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:21Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-2-16, 18:41:37Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 18:41:37Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-16, 18:40:30Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-14, 11:59:17Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-14, 00:32:07Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-14, 00:32:06Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-14, 00:32:06Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 05:40:42Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:23:26Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.0;CM-VER=3.0;
2021-2-12, 03:22:55Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:18:54Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:18:53Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:18:53Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:18:14Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:18:11Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:18:11Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-12, 03:17:03Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 14:31:20Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.0;CM-VER=3.0;
2021-2-9, 14:30:49Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 12:58:19Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 12:58:18Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 12:58:18Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 12:57:10Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 12:00:32Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.0;CM-VER=3.0;
2021-2-9, 12:00:24Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 11:59:33Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
2021-2-9, 11:58:34Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.0;CM-VER=3.0;
2021-2-9, 11:58:06Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:4c:21:30;CMTS-MAC=00:01:5c:96:48:53;CM-QOS=1.1;CM-VER=3.0;
  • plemans's avatar
    plemans
    Guru - Experienced User
    Feb 17, 2021

    You're getting a lot of timeouts. Thats when the modem isn't connecting back to the cmts. Tends to be line issues. 

    You can check your side of the line again for kinks, damage, loose/old/bad/corroded connectors. If you can't find anything, the isp needs to check the line