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I have had an outage after power loss and seemingly random
I am having a similar issue as the original post. I have had an outage after power loss and seemingly random?
Firmware Version on CBR 750 is V4.6.14.4_2.3.12
Firmware Version on RBS x 2 is V4.6.14.3
Cable Diagnostic
Status: Good
Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
Internet Access: Good
Downstream Status: Good
Downstream Power Level: Good
Downstream SNR: Good
Upstream Status: Good
Upstream Power Level: Good
Current time: Fri Mar 8 14:06:49 2024
Startup Procedure
Acquire Downstream Channel: 285000000 Hz Locked
Connectivity State: Ok Operational
Boot State: Ok Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD honorMdd(4)
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM 256 1 285000000 Hz 2.9 38.9 30 0
2 Locked QAM 256 2 291000000 Hz 2.4 38.6 28 4
3 Locked QAM 256 3 297000000 Hz 2.5 40.3 39 1
4 Locked QAM 256 4 303000000 Hz 2.2 38.9 31 0
5 Locked QAM 256 5 309000000 Hz 2.0 40.3 30 3
6 Locked QAM 256 6 315000000 Hz 2.0 38.9 10 27
7 Locked QAM 256 7 321000000 Hz 2.0 38.9 13 32
8 Locked QAM 256 8 327000000 Hz 2.2 38.9 16 16
9 Locked QAM 256 9 333000000 Hz 2.0 38.9 8 27
10 Locked QAM 256 10 339000000 Hz 2.2 40.3 8 32
11 Locked QAM 256 11 345000000 Hz 2.0 40.9 23 9
12 Locked QAM 256 12 351000000 Hz 2.2 40.3 7 33
13 Locked QAM 256 13 357000000 Hz 2.2 38.9 9 30
14 Locked QAM 256 14 363000000 Hz 2.2 40.3 12 26
15 Locked QAM 256 15 369000000 Hz 2.0 40.3 3 31
16 Locked QAM 256 16 375000000 Hz 1.5 38.6 11 23
17 Locked QAM 256 17 381000000 Hz 1.7 38.9 3 38
18 Locked QAM 256 18 387000000 Hz 1.5 40.9 8 29
19 Locked QAM 256 19 393000000 Hz 1.2 38.9 5 32
20 Locked QAM 256 20 399000000 Hz 1.2 40.3 4 30
21 Locked QAM 256 21 405000000 Hz 1.2 38.9 5 33
22 Locked QAM 256 22 411000000 Hz 1.4 40.3 6 27
23 Locked QAM 256 23 417000000 Hz 1.5 38.9 13 19
24 Locked QAM 256 24 423000000 Hz 1.2 38.9 9 31
25 Locked QAM 256 25 429000000 Hz 1.5 38.9 4 31
26 Locked QAM 256 26 435000000 Hz 1.4 38.9 16 28
27 Locked QAM 256 27 441000000 Hz 1.2 40.3 13 28
28 Locked QAM 256 28 465000000 Hz 0.9 38.9 21 0
29 Locked QAM 256 29 471000000 Hz 0.7 38.9 0 0
30 Locked QAM 256 30 477000000 Hz 0.5 38.6 0 0
31 Locked QAM 256 31 483000000 Hz 0.5 38.9 30 0
32 Locked QAM 256 32 489000000 Hz 0.5 38.9 12 0
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 3 5120 30400000 Hz 43.0
2 Locked ATDMA 4 5120 36800000 Hz 43.0
3 Not Locked N/A 0 0 0 Hz 0.0
4 Not Locked N/A 0 0 0 Hz 0.0
5 Not Locked N/A 0 0 0 Hz 0.0
6 Not Locked N/A 0 0 0 Hz 0.0
7 Not Locked N/A 0 0 0 Hz 0.0
8 Not Locked N/A 0 0 0 Hz 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 2 159 644000000 Hz 0.0 dBmV 40.2 dB 388~3707 0 0 0
2 Not Locked 0 0 0 Hz 0.0 dBmV 0.0 dB 0~4095 0 0 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Locked 0 7 5300000 Hz 39.0 dBmV
2 Not Locked 0 0 0 Hz 0.0 dBmV
Event Log
Time Priority Description
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 12:58:30 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:01:08 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:01:11 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:01:12 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Mar 08 2024 13:01:12 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:01:14 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:03:00 Notice US profile assignment change. US Chan ID: 7
Mar 08 2024 13:04:04 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:04:05 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:04:08 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:04:11 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:04:13 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Mar 08 2024 13:05:31 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Mar 08 2024 13:05:31 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:05:32 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Mar 08 2024 13:05:32 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:05:34 Critical No Ranging Response received - T3 time-out
Mar 08 2024 13:05:34 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:05:36 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Mar 08 2024 13:05:38 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:06:52 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:06:53 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:06:55 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:06:58 Notice CM-STATUS message sent. Event Type Code: 24
Mar 08 2024 13:07:01 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:07:05 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:07:06 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Mar 08 2024 13:07:06 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Mar 08 2024 13:07:07 Critical SYNC Timing Synchronization failure - Loss of Sync
Mar 08 2024 13:07:07 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Mar 08 2024 13:07:15 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 13:11:36 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 08 2024 13:11:40 Warning REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value
Mar 08 2024 13:11:40 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Mar 08 2024 13:11:40 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Mar 08 2024 13:11:41 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Mar 08 2024 13:11:51 Alert CM Certificate Error
Mar 08 2024 13:11:54 Notice US profile assignment change. US Chan ID: 7
Mar 08 2024 13:46:08 Notice CM-STATUS message sent. Event Type Code: 5
Mar 08 2024 14:00:37 Critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
1 Reply
Power levels are good.
Seeing some correctables and un-correctables that should be zeros.
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.
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/
