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Cm600 connection issues xfinity
I've been having connection issues with modem on and off for about 6 months. It usually happens when my router, or modem loses power and starts back up. My router is a asus RT-AX86U Pro running asuswrt-merlin firmware.
I spoke to support desk for xfinity and they said my line is clean and shows a healthy signal. They suggested I try manufacture support and here I am.
Any help would be appreciated.
Thanks
Checking on the cm600 logs I noticed that I only have 1 Upstream bonded channel locked, but should have more.
1 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 57.0 dBmV
Here's the event log
Time Priority Description
2024-12-11, 12:49:18 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:48:29 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:48:23 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:47:34 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:47:31 Critical (3) No UCDs Received - Timeout;;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:47:11 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:46:26 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:46:22 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:49 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:27 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:23 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:22 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:11 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:10 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:07 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:00 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:44:57 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:44:04 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:43:17 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:43:13 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:42:22 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:41:31 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:41:24 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:40:41 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:39:50 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:38:13 Critical (3) No UCDs Received - Timeout;;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:37:56 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:37:51 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:37:43 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:37:31 Critical (3) REG RSP not received;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:36:05 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:36:00 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:35:13 Critical (3) No UCDs Received - Timeout;;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:34:56 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:34:51 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:34:03 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:33:57 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:33:40 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:33:08 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
I spoke to support desk for xfinity and they said my line is clean and shows a healthy signal. They suggested I try manufacture support and here I am.
Any help would be appreciated.
Thanks
Checking on the cm600 logs I noticed that I only have 1 Upstream bonded channel locked, but should have more.
1 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 57.0 dBmV
Here's the event log
Time Priority Description
2024-12-11, 12:49:18 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:48:29 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:48:23 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:47:34 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:47:31 Critical (3) No UCDs Received - Timeout;;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:47:11 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:46:26 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:46:22 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:49 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:27 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:23 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:22 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:11 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:10 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:07 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:45:00 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:44:57 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:44:04 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:43:17 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:43:13 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:42:22 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:41:31 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:41:24 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:40:41 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:39:50 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:38:13 Critical (3) No UCDs Received - Timeout;;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:37:56 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:37:51 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:37:43 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:37:31 Critical (3) REG RSP not received;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:36:05 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:36:00 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:35:13 Critical (3) No UCDs Received - Timeout;;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:34:56 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:34:51 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:34:03 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.0;CM-VER=3.0;
2024-12-11, 12:33:57 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:33:40 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=04:2a:e2:c6:49:5d;CM-QOS=1.1;CM-VER=3.0;
2024-12-11, 12:33:08 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:45:5a:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
- So xfinity tech came out today and traced my coaxial cable back to a splitter. My apartment complex is old and the splitter was hidden. To make it worse, the previous tenants set it up with the input/output cables reversed. That combined with my older modem is what was causing the issues. The tech removed the splitter and my old router is now able to connect to 4 Upstream channels.
I'm also getting a new modem this weekend and went with a surfboard sb8200.
Thanks everyone for the help and input. It's much appreciated. Happy Holidays
8 Replies
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
Please post a copy and paste of the modems connection status log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-routerFrequency start Value This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect. Starting Frequency Startup Procedure
Procedure Status Comment Acquire Downstream Channel 459000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv6 only <tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 5 459000000 Hz -0.1 dBmV 42.5 dB 0 0 2 Locked QAM256 22 561000000 Hz 0.3 dBmV 41.9 dB 0 0 3 Locked QAM256 23 567000000 Hz 0.4 dBmV 42.1 dB 0 0 4 Locked QAM256 24 573000000 Hz 0.6 dBmV 42.2 dB 1 0 5 Locked QAM256 1 435000000 Hz 0.4 dBmV 42.4 dB 0 0 6 Locked QAM256 2 441000000 Hz -0.1 dBmV 42.0 dB 0 0 7 Locked QAM256 3 447000000 Hz -0.7 dBmV 41.8 dB 0 0 8 Locked QAM256 4 453000000 Hz 0.6 dBmV 42.9 dB 0 0 9 Locked QAM256 6 465000000 Hz 0.4 dBmV 42.8 dB 0 0 10 Locked QAM256 7 471000000 Hz 0.6 dBmV 42.8 dB 0 0 11 Locked QAM256 8 477000000 Hz -0.4 dBmV 42.0 dB 0 0 12 Locked QAM256 9 483000000 Hz 0.6 dBmV 42.6 dB 0 0 13 Locked QAM256 10 489000000 Hz 0.1 dBmV 42.3 dB 0 0 14 Locked QAM256 11 495000000 Hz -0.1 dBmV 42.4 dB 0 0 15 Locked QAM256 12 501000000 Hz 0.7 dBmV 43.0 dB 0 0 16 Locked QAM256 13 507000000 Hz 0.3 dBmV 38.6 dB 0 0 17 Locked QAM256 14 513000000 Hz -0.4 dBmV 42.4 dB 0 0 18 Locked QAM256 15 519000000 Hz -0.5 dBmV 42.0 dB 0 0 19 Locked QAM256 16 525000000 Hz -1.0 dBmV 41.9 dB 0 0 20 Locked QAM256 17 531000000 Hz -0.4 dBmV 41.9 dB 0 0 21 Locked QAM256 18 537000000 Hz -0.6 dBmV 41.9 dB 0 0 22 Locked QAM256 19 543000000 Hz -0.5 dBmV 41.8 dB 0 0 23 Locked QAM256 20 549000000 Hz -0.1 dBmV 41.9 dB 0 0 24 Locked QAM256 21 555000000 Hz -0.3 dBmV 41.9 dB 1 0 <tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 57.0 dBmV 2 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Cable Connections data is good.
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.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/The CM600 is of older model so you may need to upgrade the modem at some point.
