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Cax80 Astound 1gig plan, intermittent downstream flashing led
Installed a cax80 on Astound/RCN. Ast made the changes, up and running but very frequent drops and dowmstream led flashing. Tech came, found many problems with cables from pole to modem. He changed e...
That has all been done, Tuesday this week. The tech found water in the coax. He changed all coax up to the connecting box on the telephone pole.
What Firmware version is loaded on the CAX80?
And after tech left, LED and such is still showing poor status?
Copied from PM from bmpcabin
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 Aug 01 14:18:09 2025Startup Procedure
Acquire Downstream Channel: 573 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 19 573000000 Hz -1.6 dBmV 39.7 dB 1795115 723552
2 Locked 256 QAM 1 321000000 Hz 0.1 dBmV 40.6 dB 50019 12383
3 Locked 256 QAM 2 327000000 Hz 0.3 dBmV 40.5 dB 58655 15670
4 Locked 256 QAM 3 333000000 Hz 0 dBmV 40.4 dB 216298 70707
5 Locked 256 QAM 4 339000000 Hz 0.2 dBmV 40 dB 96563 26362
6 Locked 256 QAM 5 345000000 Hz 0.2 dBmV 40.4 dB 62378 16554
7 Locked 256 QAM 6 351000000 Hz -0.1 dBmV 40.1 dB 51041 11960
8 Locked 256 QAM 7 357000000 Hz 0.1 dBmV 40.1 dB 32985 9231
9 Locked 256 QAM 8 363000000 Hz 0.2 dBmV 39.9 dB 6044 1199
10 Locked 256 QAM 9 369000000 Hz 0.3 dBmV 39.9 dB 38974 10159
11 Locked 256 QAM 10 519000000 Hz -2.1 dBmV 39.3 dB 12559678 9127788
12 Locked 256 QAM 11 525000000 Hz -2 dBmV 39.3 dB 44238810 13230715
13 Locked 256 QAM 12 531000000 Hz -2.4 dBmV 38 dB 13149128 3854574
14 Locked 256 QAM 13 537000000 Hz -2.5 dBmV 38.6 dB 14011605 3107828
15 Locked 256 QAM 14 543000000 Hz -2.1 dBmV 39.3 dB 60678513 17543455
16 Locked 256 QAM 15 549000000 Hz -1.7 dBmV 39.6 dB 8801207 489434
17 Locked 256 QAM 16 555000000 Hz -1.8 dBmV 39.4 dB 1523833 122277
18 Locked 256 QAM 17 561000000 Hz -1.4 dBmV 39.6 dB 49160 14122
19 Locked 256 QAM 18 567000000 Hz -1.5 dBmV 39.7 dB 12491 3092
20 Locked 256 QAM 20 579000000 Hz -1.5 dBmV 39.9 dB 11197084 3679923
21 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
22 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
23 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
24 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
25 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
26 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
27 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
28 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
29 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
30 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
31 Not Locked Unknown 0 0 Hz 0.0 0.0 0 0
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 36800000 Hz 41.0 dBmV
2 Locked ATDMA 5 5120 Ksym/sec 30350000 Hz 41.0 dBmV
3 Locked ATDMA 6 5120 Ksym/sec 23900000 Hz 40.5 dBmV
4 Not Locked Unknown 0 0 0 0.0
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 675000000 Hz -0.62 dBmV 37.7 dB 166 ~ 3929 9229985088 7196099353 53875839
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 Locked 3 ,4 ,9 ,10 ,11 ,12 ,13 8 5300000 Hz 38.8 dBmV
2 Not Locked 0 0 0 Hz 0 dBmVWhat Firmware version is loaded on the CAX80?
Not all Channels are locked in. Something to ask the ISP about.
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#M12853https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
Your even log looks ok. No criticals, errors or warning there.
The ISP in this case is Astound/RCN. Tech said 20 locked channels is what they expect on my 1 gig plan. ISP tech will be here next Thursday. I will update this post.
No splitters, only one connector (coax union inside box on side of house) between coax from the service pole and one line direct into modem. All new lines connectors, etc, all new.
12db attenuator was added to bring power levels close to zero. Attenuator is located in box on house to have easy access for technicians. I will post cable diagnostics and logs after they repair.