NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
Losing connection Intermittently CAX80
For the past 3 weeks I have been losing connection multiple times in the day and I cannot figure it out. I my cable ISP (COX) has confirmed the connection from their side is good and I have reset the...
| Hardware Version | 1.01 |
| Firmware Version | V2.1.5.2 |
| Cable Firmware Version | V1.02.08 |
Missing the FW version for the router portion.
Please post a copy and paste of the modems connection status and event log page.
Firmware Version V2.1.5.2 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: Wed Apr 12 12:19:21 2023Startup Procedure
Acquire Downstream Channel: 747 MHz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked 256 QAM 5 747000000 Hz -0.1 dBmV 39.2 dB 907819 461941
2 Locked 256 QAM 1 723000000 Hz 0.7 dBmV 39.5 dB 4982 14747
3 Locked 256 QAM 2 729000000 Hz 0.9 dBmV 39.8 dB 23665 80625
4 Locked 256 QAM 3 735000000 Hz 0.8 dBmV 39.8 dB 23592 78043
5 Locked 256 QAM 4 741000000 Hz 0.3 dBmV 39.4 dB 6128 6868
6 Locked 256 QAM 6 753000000 Hz -0.6 dBmV 38.9 dB 12666298 10391830
7 Locked 256 QAM 7 759000000 Hz -1.1 dBmV 38.7 dB 22478 71503
8 Locked 256 QAM 8 765000000 Hz -1.4 dBmV 38.5 dB 24300 67724
9 Locked 256 QAM 9 771000000 Hz -1.4 dBmV 38.5 dB 2754 6356
10 Locked 256 QAM 10 777000000 Hz -1.5 dBmV 38.5 dB 27896 82541
11 Locked 256 QAM 11 783000000 Hz -1.6 dBmV 38.3 dB 24716 64307
12 Locked 256 QAM 12 789000000 Hz -1.6 dBmV 38.2 dB 24354 68364
13 Locked 256 QAM 13 795000000 Hz -1.6 dBmV 38.2 dB 22352 62874
14 Locked 256 QAM 14 801000000 Hz -1.5 dBmV 38.3 dB 27448 75614
15 Locked 256 QAM 15 807000000 Hz -2 dBmV 37.8 dB 24053 70642
16 Locked 256 QAM 16 813000000 Hz -2.7 dBmV 37.4 dB 23964 69823
17 Locked 256 QAM 17 819000000 Hz -3.5 dBmV 36.9 dB 23880 73601
18 Locked 256 QAM 18 825000000 Hz -4.1 dBmV 36.5 dB 23665 70295
19 Locked 256 QAM 19 831000000 Hz -4.1 dBmV 36.4 dB 22585 63544
20 Locked 256 QAM 20 837000000 Hz -4 dBmV 36.5 dB 5222 12750
21 Locked 256 QAM 21 843000000 Hz -3.9 dBmV 36.6 dB 26054 74752
22 Locked 256 QAM 22 849000000 Hz -4 dBmV 36.5 dB 24072 68485
23 Locked 256 QAM 23 855000000 Hz -4.4 dBmV 36.2 dB 25668 71180
24 Locked 256 QAM 24 861000000 Hz -5.1 dBmV 35.9 dB 31460 81279
25 Locked 256 QAM 41 405000000 Hz 3.3 dBmV 40.4 dB 3873 12213
26 Locked 256 QAM 42 411000000 Hz 3.4 dBmV 40.4 dB 3677 10785
27 Locked 256 QAM 43 417000000 Hz 3.4 dBmV 40.4 dB 42764 190880
28 Locked 256 QAM 44 423000000 Hz 3 dBmV 40.2 dB 47434 206352
29 Locked 256 QAM 45 429000000 Hz 2.8 dBmV 40.1 dB 4108 13016
30 Locked 256 QAM 46 435000000 Hz 2.8 dBmV 40.1 dB 33483 146509
31 Locked 256 QAM 47 441000000 Hz 2.7 dBmV 40.2 dB 30583 137277
32 Locked 256 QAM 48 447000000 Hz 2.4 dBmV 39.8 dB 3068 8744
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 17400000 Hz 37.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 23900000 Hz 38.5 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 30300000 Hz 38.5 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 36700000 Hz 39.0 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 Locked 0 ,1 ,2 ,3 159 300000000 Hz 8.78 dBmV 43.5 dB 2216 ~ 5975 269592445 21620212 458487
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
Event Log
Time Priority Description
Wed Apr 12 11:48:59 2023 Notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 11:02:06 2023 Notice CM-STATUS message sent. Event Type Code: 24; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 11:02:06 2023 Notice CM-STATUS message sent. Event Type Code: 22; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 11:01:42 2023 Notice 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=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 11:01:38 2023 Notice CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:49 2023 Warning Dynamic Range Window violation
Wed Apr 12 10:48:49 2023 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:49 2023 Warning Dynamic Range Window violation
Wed Apr 12 10:48:49 2023 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:49 2023 Warning Dynamic Range Window violation
Wed Apr 12 10:48:49 2023 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:44 2023 Notice TLV-11 - unrecognized OID;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:44 2023 Warning DHCP WARNING - Non-critical field invalid in response ;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:41 2023 Notice Honoring MDD; IP provisioning mode = IPv4
Wed Apr 12 10:48:27 2023 Critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:08 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:48:07 2023 Critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:47:48 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:47:47 2023 Critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:47:28 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:47:27 2023 Critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:53 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:52 2023 Warning MDD message timeout;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:47 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:46 2023 Warning MDD message timeout;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:39 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:38 2023 Warning MDD message timeout;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:37 2023 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:33 2023 Notice CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:46:33 2023 Notice CM-STATUS message sent. Event Type Code: 2; Chan ID: 45 46 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:44:27 2023 Warning Dynamic Range Window violation
Wed Apr 12 10:44:27 2023 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:43:51 2023 Notice CM-STATUS message sent. Event Type Code: 4; Chan ID: 6; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:43:44 2023 Warning MDD message timeout;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:43:32 2023 Notice CM-STATUS message sent. Event Type Code: 4; Chan ID: 6; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:43:28 2023 Notice CM-STATUS message sent. Event Type Code: 1; Chan ID: 6; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:43:26 2023 Warning MDD message timeout;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:42:20 2023 Notice CM-STATUS message sent. Event Type Code: 4; Chan ID: 6; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:42:14 2023 Notice CM-STATUS message sent. Event Type Code: 1; Chan ID: 6; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;
Wed Apr 12 10:42:08 2023 Warning MDD message timeout;CM-MAC=80:cc:9c:70:ac:68;CMTS-MAC=f8:b7:e2:05:18:eb;CM-QOS=1.1;CM-VER=3.1;You have a ton of correct and un-correctables that should be all zero's across the channels.
All Criticals, Errors and Warnings needs to be reviewed by the ISP and resolved. These indicate issues on the signal cable line.
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.htmlThank you for look it. Since the modem is one they provided, they are not going to trouble shoot the hardware. COX already told me this. I really have no faith in those technicians' actual tech knowledge. It will be interesting to see who comes and what the technician says/does. So, there is a good chance I will have to do it on my own eventually. Is there documentation or a support video I can follow to correct the items you mentioned?
SO the ISP provided this CAX80 to you? if so, they can look at the HW since it came from them, however seems odd they provided this modem to you.
The ISP IS responsible for any and all items and issues up the back of the modem.All troubleshooting information has been linked.