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Re: Switched from CM3000 to CAX80 and it destroyed upload/download speeds
Hi all. I too am having issues getting the downstream fully bonded, however I am on Cox.
The demarcation line from teh street comes directly into my smart box. The dmark line has a MOCA filter then feeds into a 3 way splitter with TWO -7db and ONE -3.5db coax outputs. I have the -3.5db line running into the DOCSISÂź 3.1 Cable Modem (CM3000) . I am using Ubiquiti Amplifi Alien router along with the CM3000.
Here are my status reports. Any ideas how to get it to fully bond? Power levels seem in spec. Cox support says its a problem with the hardware, of course.
Thanks!!
Cable Diagnostic
Status: Poor
Action:
[Partial Service]
If the Partial Service mode does not go away within a few hours (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary splitters.
3) Replace any required ones.
4) Contact your service provider for troubleshooting help.
CM Status: Good
Downstream Status: Poor
Partial Service: Poor
Cable modem is in partial service mode. Your service provider might be under maintenance. Most of the time it won't affect your traffic and will automatically clear when work is complete.
Downstream Power Level: Good
Downstream SNR Level: Good
Upstream Status: Good
Upstream Power Level: Good
Current Time: Wed Apr 23 18:57:47 2025
Startup Procedure
Acquire Downstream Channel: 855000000 Hz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD IPv4 only
Downstream Bonded Channels (Partial Service)
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 21 855000000 Hz 7.8 43.1 0 0
2 Locked QAM256 1 735000000 Hz 6.3 43.2 0 0
3 Locked QAM256 2 741000000 Hz 6.5 43.2 0 0
4 Locked QAM256 3 747000000 Hz 6.7 43.3 0 0
5 Locked QAM256 4 753000000 Hz 7.1 43.2 0 0
6 Locked QAM256 5 759000000 Hz 7.6 43.6 0 0
7 Locked QAM256 6 765000000 Hz 7.9 43.6 0 0
8 Locked QAM256 7 771000000 Hz 8.1 43.7 0 0
9 Locked QAM256 8 777000000 Hz 8.2 43.7 0 0
10 Locked QAM256 13 807000000 Hz 8.2 43.5 0 0
11 Locked QAM256 19 843000000 Hz 8 43.2 0 0
12 Locked QAM256 20 849000000 Hz 7.9 43.2 0 0
13 Locked QAM256 22 861000000 Hz 7.4 43 0 0
14 Locked QAM256 23 867000000 Hz 7.1 42.9 0 0
15 Locked QAM256 24 873000000 Hz 6.9 42.6 0 0
16 Locked QAM256 25 117000000 Hz 0.2 40.1 0 0
17 Locked QAM256 26 123000000 Hz 0.2 40.2 0 0
18 Locked QAM256 27 129000000 Hz 0.3 40.3 0 0
19 Locked QAM256 28 135000000 Hz 0 40.7 0 0
20 Locked QAM256 29 141000000 Hz -0.1 40.8 0 0
21 Locked QAM256 30 147000000 Hz -0.2 40.5 0 0
22 Locked QAM256 31 153000000 Hz 0.4 40.5 0 0
23 Locked QAM256 32 159000000 Hz 0.7 40.3 0 0
24 Locked QAM256 40 207000000 Hz 2.8 42.6 0 0
25 Locked QAM256 41 213000000 Hz 3.1 42.8 0 0
26 Locked QAM256 42 219000000 Hz 3.3 43 0 0
27 Locked QAM256 43 225000000 Hz 3.4 43.1 0 0
28 Locked QAM256 44 231000000 Hz 3.6 42.3 729200 1208268
29 Locked QAM256 45 237000000 Hz 3.6 41.5 61173 8629
30 Locked QAM256 46 243000000 Hz 3.7 41.6 181355 24636
31 Locked QAM256 47 249000000 Hz 3.5 42.7 0 0
32 Locked QAM256 48 255000000 Hz 3.5 42.7 0 0
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 16900000 Hz 39.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 36300000 Hz 40.3 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 29900000 Hz 39.8 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 23500000 Hz 39.3 dBmV
5 Not Locked Unknown 0 0 0 0.0
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Not Locked 0 ,1 ,2 ,3 159 300000000 Hz 4.38 dBmV 42.0 dB 296 ~ 7895 107770158 33802951 249524
2 Locked 0 ,1 ,2 ,3 160 918000000 Hz 7.38 dBmV 42.2 dB 2216 ~ 5975 53053059 21788554 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Locked 10 ,13 6 36800000 Hz 35.3 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
Event Log
Time Priority Description
Wed Apr 23 18:52:08 2025 Notice (6) US profile assignment change. US Chan ID: 6; Previous Profile: 9 13; New Profile: 10 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:48:31 2025 Notice (6) US profile assignment change. US Chan ID: 6; Previous Profile: 13; New Profile: 9 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:48:06 2025 Notice (6) CM-STATUS message sent. Event Type Code: 20; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:48:00 2025 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:47:39 2025 Warning (5) Dynamic Range Window violation
Wed Apr 23 18:47:39 2025 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:47:39 2025 Warning (5) Dynamic Range Window violation
Wed Apr 23 18:47:39 2025 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:47:32 2025 Notice (6) DS profile assignment change. DS Chan ID: 33; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:47:31 2025 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:47:26 2025 Notice (6) TLV-11 - unrecognized OID;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=;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=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 23 18:46:15 2025 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sat Apr 19 14:10:09 2025 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;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=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=CMTS-MAC=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=;CMTS-MAC=00:00:00:00:00:00;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=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) Resetting the cable modem due to docsDevResetNow
29 Replies
Well the CM is more capable modem than the CAX80 though the CAX has a built in router and wifi.
Was the CM modem working before you changed to the CAX80?
The CAX80 may not have same speed support as the ISP level as the CM3000 may have. Something to check with them about.
What speeds UP and Down do you pay for?
Power levels are a bit all over the place. Should be close to each other across all channels.
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
You have lots of correctables and uncorrectables on channels 28, 29 and 30 and should look like zeros with the other channels.
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.
Lots of correctables and un-correctables that should be mostly zeros.
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://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/How to resolve the correctables and uncorrectables in the three specified channels? I have tried removing the MOCA filter and using the dmark line direct into the modem. This yielded 30mbps download speeds. Put it back to the way I have it as described now, and I get about 700mbps dl. I pay for 940mbps. The only thing I havent tried is using the -7db output from the splitter and/or replacing the 9 year old splitter.
Something to to try.
Have the ISP take a look as well.
