New - CAX80 Firmware Version 2.1.3.5 Released

[FURRYe38]

New Features and Enhancements:

• Cable diagnostic GUI.
• Wifi and 2.5GE stability fixes.
• WPA3 support.

Security Fixes:

Fixed security issues.

For more information about security vulnerabilities, visit https://www.netgear.com/about/security.

Firmware Update Instructions:

Download Link: https://www.downloads.netgear.com/files/GDC/CAX80/CAX80-V2.1.3.5.zip

To update your product’s firmware, follow the instructions in your product’s user manual. To find your user manual, visit https://www.netgear.com/support/, enter your model number in the search box, and click the Documenta...

https://kb.netgear.com/24231/How-do-I-back-up-the-router-configuration-settings-on-my-Nighthawk-rout...

This article applies to:

• Cable Gateway AX (1)
  • CAX80

Let us know how it works for you...

[nsne]

I've got an issue with this firmware reporting my cable connection as "Poor" even though I'm getting full upstream bandwidth (41+ Mbps of a theoretical 40 Mbps max).

[plemans]

@nsne have you started your own thread?

Make sure to include a screen snip of the cable connections page and event logs. 

[nsne]

Hey, plemans. No, I haven't started my own thread (yet). @FURRYe38 signed off saying, "Let us know how it works for you..." so I was obliging that request.

I'm attaching a screenshot of the text output from the Cable Diagnostics. I didn't include the event logs, as they seem to have some MAC info in there that I'd rather not post publicly.

[FURRYe38]

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. 
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-Mod...

You can post the Events Log here in the forums.

@nsne 

[EpicBaldGuy]

I have the same issue.  This is recent and I do have a splitter which was installed by the cable guy (Comcast).  I recall him actually swapping out the previous splitter because he told me that the old one was causing signal issues, so I am very confident that this issue is the cable modem itself (perhaps due to a recent FW update).  The splitter was replaced in early 2021, so it also isn't that old.

[FURRYe38]

What issue are you seeing?

Can you remove the splitter and run the modem with out it temporarily and see if the problem continues? 

Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure your using good quality RG6 coax cable up to the modem. 
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-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

---

@EpicBaldGuy wrote:

I have the same issue.  This is recent and I do have a splitter which was installed by the cable guy (Comcast).  I recall him actually swapping out the previous splitter because he told me that the old one was causing signal issues, so I am very confident that this issue is the cable modem itself (perhaps due to a recent FW update).  The splitter was replaced in early 2021, so it also isn't that old.

---

[dadabunchie]

I have similar issue except with the downstream status.  No splits or changes of recent.

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: Good

Upstream Status: Good

Upstream Power Level: Good

Current time: Wed Feb 16 15:44:28 2022

Startup Procedure
Acquire Downstream Channel: 475 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 2 475750000 Hz 9.6 dBmV 44 dB 147231938 669
2 Locked 256 QAM 3 481750000 Hz 9.6 dBmV 44 dB 143577337 613
3 Locked 256 QAM 4 487750000 Hz 9.9 dBmV 44 dB 143375909 704
4 Locked 256 QAM 5 493750000 Hz 9.8 dBmV 43.9 dB 143245910 657
5 Locked 256 QAM 6 499750000 Hz 9.8 dBmV 44 dB 142609526 689
6 Locked 256 QAM 7 505750000 Hz 9.8 dBmV 44 dB 142124154 670
7 Locked 256 QAM 8 511750000 Hz 9.6 dBmV 43.9 dB 141437329 529
8 Locked 256 QAM 9 517750000 Hz 9.6 dBmV 43.9 dB 140908416 576
9 Locked 256 QAM 10 523750000 Hz 9.5 dBmV 43.8 dB 140325022 579
10 Locked 256 QAM 11 529750000 Hz 9.5 dBmV 43.8 dB 139872719 637
11 Locked 256 QAM 12 535750000 Hz 9.4 dBmV 43.7 dB 139659989 642
12 Locked 256 QAM 13 541750000 Hz 9.3 dBmV 43.7 dB 139414754 488
13 Locked 256 QAM 14 547750000 Hz 9.3 dBmV 43.6 dB 139466993 589
14 Locked 256 QAM 15 553750000 Hz 9.2 dBmV 43.6 dB 141868431 522
15 Locked 256 QAM 16 559750000 Hz 9.2 dBmV 43.5 dB 142024295 476
16 Locked 256 QAM 18 571750000 Hz 9.1 dBmV 43.4 dB 142206679 448
17 Locked 256 QAM 19 577750000 Hz 9.1 dBmV 43.5 dB 142613796 485
18 Locked 256 QAM 20 583750000 Hz 9.2 dBmV 43.4 dB 142569869 446
19 Locked 256 QAM 21 589750000 Hz 9.2 dBmV 43.4 dB 142844383 473
20 Locked 256 QAM 22 595750000 Hz 9.3 dBmV 43.4 dB 142925619 426
21 Locked 256 QAM 23 601750000 Hz 9.5 dBmV 43.4 dB 142959546 397
22 Locked 256 QAM 24 607750000 Hz 9.4 dBmV 43.5 dB 142747565 449
23 Locked 256 QAM 25 613750000 Hz 9.2 dBmV 43.3 dB 144863827 396
24 Locked 256 QAM 26 619750000 Hz 9.3 dBmV 43.3 dB 144514123 298
25 Locked 256 QAM 27 625750000 Hz 9.2 dBmV 43.2 dB 144194422 346
26 Locked 256 QAM 28 631750000 Hz 9.2 dBmV 43.2 dB 143897454 374
27 Locked 256 QAM 29 637750000 Hz 9.2 dBmV 43.1 dB 143525838 299
28 Locked 256 QAM 30 643750000 Hz 9.2 dBmV 43.1 dB 143447674 295
29 Locked 256 QAM 31 649750000 Hz 9.2 dBmV 43.1 dB 143407215 268
30 Locked 256 QAM 32 655750000 Hz 9 dBmV 43 dB 142880720 252
31 Locked 256 QAM 33 661750000 Hz 9.1 dBmV 42.3 dB 143002998 270
32 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0

Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 37000000 Hz 33.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 17800000 Hz 31.8 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 24200000 Hz 32.8 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 30600000 Hz 33.0 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 1 343000000 Hz 11.48 dBmV 44.9 dB 1128 ~ 2967 43424399375 2613596200 2759379
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

[FURRYe38]

You have correct and un-correctables which should be near zero.

Power levels are a bit too high:

https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311

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. 
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-Mod...

https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

---

@dadabunchie wrote:

I have similar issue except with the downstream status.  No splits or changes of recent.

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: Good

Upstream Status: Good

Upstream Power Level: Good

Current time: Wed Feb 16 15:44:28 2022

Startup Procedure
Acquire Downstream Channel: 475 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 2 475750000 Hz 9.6 dBmV 44 dB 147231938 669
2 Locked 256 QAM 3 481750000 Hz 9.6 dBmV 44 dB 143577337 613
3 Locked 256 QAM 4 487750000 Hz 9.9 dBmV 44 dB 143375909 704
4 Locked 256 QAM 5 493750000 Hz 9.8 dBmV 43.9 dB 143245910 657
5 Locked 256 QAM 6 499750000 Hz 9.8 dBmV 44 dB 142609526 689
6 Locked 256 QAM 7 505750000 Hz 9.8 dBmV 44 dB 142124154 670
7 Locked 256 QAM 8 511750000 Hz 9.6 dBmV 43.9 dB 141437329 529
8 Locked 256 QAM 9 517750000 Hz 9.6 dBmV 43.9 dB 140908416 576
9 Locked 256 QAM 10 523750000 Hz 9.5 dBmV 43.8 dB 140325022 579
10 Locked 256 QAM 11 529750000 Hz 9.5 dBmV 43.8 dB 139872719 637
11 Locked 256 QAM 12 535750000 Hz 9.4 dBmV 43.7 dB 139659989 642
12 Locked 256 QAM 13 541750000 Hz 9.3 dBmV 43.7 dB 139414754 488
13 Locked 256 QAM 14 547750000 Hz 9.3 dBmV 43.6 dB 139466993 589
14 Locked 256 QAM 15 553750000 Hz 9.2 dBmV 43.6 dB 141868431 522
15 Locked 256 QAM 16 559750000 Hz 9.2 dBmV 43.5 dB 142024295 476
16 Locked 256 QAM 18 571750000 Hz 9.1 dBmV 43.4 dB 142206679 448
17 Locked 256 QAM 19 577750000 Hz 9.1 dBmV 43.5 dB 142613796 485
18 Locked 256 QAM 20 583750000 Hz 9.2 dBmV 43.4 dB 142569869 446
19 Locked 256 QAM 21 589750000 Hz 9.2 dBmV 43.4 dB 142844383 473
20 Locked 256 QAM 22 595750000 Hz 9.3 dBmV 43.4 dB 142925619 426
21 Locked 256 QAM 23 601750000 Hz 9.5 dBmV 43.4 dB 142959546 397
22 Locked 256 QAM 24 607750000 Hz 9.4 dBmV 43.5 dB 142747565 449
23 Locked 256 QAM 25 613750000 Hz 9.2 dBmV 43.3 dB 144863827 396
24 Locked 256 QAM 26 619750000 Hz 9.3 dBmV 43.3 dB 144514123 298
25 Locked 256 QAM 27 625750000 Hz 9.2 dBmV 43.2 dB 144194422 346
26 Locked 256 QAM 28 631750000 Hz 9.2 dBmV 43.2 dB 143897454 374
27 Locked 256 QAM 29 637750000 Hz 9.2 dBmV 43.1 dB 143525838 299
28 Locked 256 QAM 30 643750000 Hz 9.2 dBmV 43.1 dB 143447674 295
29 Locked 256 QAM 31 649750000 Hz 9.2 dBmV 43.1 dB 143407215 268
30 Locked 256 QAM 32 655750000 Hz 9 dBmV 43 dB 142880720 252
31 Locked 256 QAM 33 661750000 Hz 9.1 dBmV 42.3 dB 143002998 270
32 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0

Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 37000000 Hz 33.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 17800000 Hz 31.8 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 24200000 Hz 32.8 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 30600000 Hz 33.0 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 1 343000000 Hz 11.48 dBmV 44.9 dB 1128 ~ 2967 43424399375 2613596200 2759379
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

---

[plemans]

With your power levels, you actually want a a splitter or attenuator. Either use a dual or triple splitter. Make sure the unused terminals have caps on them if you use a splitter. Otherwise you can use an attenuator. 

Also make sure the connections are tight