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CM1000v2 signal drops intermittently
I am losing internet intermittently. ISP is saying it is a modem batch error. The internet drops and then comes back within 60 seconds usually. I've tried rebooting, switching out LAN cable. Trying to decide if modem is going bad or if there is another change I need to make. OR if it is actually the ISP.
Screenshots of setup & event log:
|
<tabindex=-1>Startup Procedure</tabindex=-1>
| Procedure | Status | Comment |
| Acquire Downstream Channel | 111000000 Hz | Locked |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Security | Enable | BPI+ |
| IP Provisioning Mode | Honor MDD | IPv4 only |
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR / MER | Unerrored Codewords | Correctable Codewords | Uncorrectable Codewords |
| 1 | Locked | QAM256 | 1 | 111000000 Hz | 0.8 dBmV | 41.5 dB | 47607937 | 0 | 0 |
| 2 | Locked | QAM256 | 2 | 117000000 Hz | 0.9 dBmV | 41.6 dB | 47652840 | 0 | 0 |
| 3 | Locked | QAM256 | 3 | 123000000 Hz | 0.8 dBmV | 41.4 dB | 47653587 | 0 | 0 |
| 4 | Locked | QAM256 | 4 | 129000000 Hz | 0.8 dBmV | 41.3 dB | 47659821 | 1 | 0 |
| 5 | Locked | QAM256 | 5 | 147000000 Hz | 0.1 dBmV | 41.5 dB | 47665606 | 0 | 0 |
| 6 | Locked | QAM256 | 6 | 153000000 Hz | -0.2 dBmV | 41.6 dB | 47668923 | 0 | 0 |
| 7 | Locked | QAM256 | 7 | 159000000 Hz | 0.1 dBmV | 41.8 dB | 47670893 | 0 | 0 |
| 8 | Locked | QAM256 | 8 | 165000000 Hz | -0.1 dBmV | 41.7 dB | 47674598 | 0 | 0 |
| 9 | Locked | QAM256 | 9 | 171000000 Hz | 0.0 dBmV | 41.7 dB | 47678905 | 0 | 0 |
| 10 | Locked | QAM256 | 10 | 177000000 Hz | 0.1 dBmV | 41.6 dB | 47682696 | 0 | 0 |
| 11 | Locked | QAM256 | 11 | 183000000 Hz | -0.1 dBmV | 41.8 dB | 47685232 | 0 | 0 |
| 12 | Locked | QAM256 | 12 | 189000000 Hz | -0.3 dBmV | 41.6 dB | 47690302 | 0 | 0 |
| 13 | Locked | QAM256 | 13 | 195000000 Hz | -0.5 dBmV | 41.6 dB | 47693292 | 0 | 0 |
| 14 | Locked | QAM256 | 14 | 201000000 Hz | -0.6 dBmV | 41.1 dB | 47697403 | 0 | 0 |
| 15 | Locked | QAM256 | 15 | 207000000 Hz | -0.5 dBmV | 41.2 dB | 47696505 | 0 | 0 |
| 16 | Locked | QAM256 | 16 | 213000000 Hz | -0.5 dBmV | 41.5 dB | 47697082 | 0 | 0 |
| 17 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 18 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 19 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 20 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 21 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 22 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 23 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 24 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 25 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 26 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 27 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 28 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 29 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 30 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 31 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
| 32 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 | 0 |
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power |
| 1 | Locked | ATDMA | 1 | 23000000 Hz | 48.3 dBmV |
| 2 | Locked | ATDMA | 2 | 16400000 Hz | 46.8 dBmV |
| 3 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV |
| 4 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV |
| 5 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV |
| 6 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV |
| 7 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV |
| 8 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV |
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
| Channel | Lock Status | Modulation / Profile ID | Channel ID | Frequency | Power | SNR / MER | Active Subcarrier Number Range | Unerrored Codewords | Correctable Codewords | Uncorrectable Codewords |
| 1 | Locked | 0, 1, 2 | 200 | 279000000 Hz | -1.1 dBmV | 39.0 dB | 148 ~ 3947 | 718678298 | 268751935 | 0 |
| 2 | Not Locked | 0 | 0 | 0 Hz | -0.7 dBmV | 0.0 dB | 0 ~ 4095 | 0 | 0 | 0 |
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
| Channel | Lock Status | Modulation / Profile ID | Channel ID | Frequency | Power |
| 1 | Locked | 3, 4, 13 | 10 | 23350000 Hz | 47.8 dBmV |
| 2 | Not Locked | 3, 4, 13 | 0 | 0 Hz | 0.0 dBmV |
5 Replies
Event Log:
Time Priority Description 2023-11-01, 09:33:32 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-11-01, 09:33:28 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-11-01, 09:33:24 Notice (6) TLV-11 - unrecognized OID;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-11-01, 09:33:24 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv4 Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2023-10-28, 15:24:18 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) Ranging Request Retries exhausted;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) Ranging Request Retries exhausted;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:19:09 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:19:05 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:18:42 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:17:55 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:16:23 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:16:10 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:58 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:52 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:48 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:39 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:35 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:32 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:21 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:15:18 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:bb;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:01:59 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:01:55 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:92;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:01:52 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:92;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:01:51 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:92;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:01:37 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:92;CM-QOS=1.1;CM-VER=3.1; 2023-10-09, 10:01:31 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=38:94:ed:9e:7b:40;CMTS-MAC=00:17:10:90:ec:92;CM-QOS=1.1;CM-VER=3.1; Whos the ISP?
Power levels are ok.
Only getting 16 channels though...what ISP Speed package do you pay for UP and DOWN?
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.
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
What is the brand and model of the host wifi router connected to the modem?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/
