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Forum Discussion
2.4ghz not connecting
I have a CAX80. I recently just changed the SSID password and I noticed the cable connection was poor. We also just has a a small snow storm.. I have power cycled the router multiple times and same t...
Firmware Version 5.1.1.8
Internet Access: Good
Downstream Status: Poor
Downstream Power Level: Poor
Downstream power is poor (10.1dBmV). The recommended level is between -10dBmV to 10dBmV.
Downstream SNR: Good
Upstream Status: Good
Upstream Power Level: Good
Current time: Mon Feb 23 04:41:58 2026
Startup Procedure
Acquire Downstream Channel: 237 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 45 237000000 Hz 9.5 dBmV 40.3 dB 0 0
2 Locked 256 QAM 1 723000000 Hz 2.8 dBmV 37.8 dB 0 0
3 Locked 256 QAM 2 729000000 Hz 3.1 dBmV 38 dB 0 0
4 Locked 256 QAM 3 735000000 Hz 2.2 dBmV 37.7 dB 0 0
5 Locked 256 QAM 4 741000000 Hz 2.1 dBmV 37.6 dB 0 0
6 Locked 256 QAM 5 747000000 Hz 2.1 dBmV 37.6 dB 0 0
7 Locked 256 QAM 6 753000000 Hz 1.5 dBmV 37.3 dB 0 0
8 Locked 256 QAM 7 759000000 Hz 1.1 dBmV 37 dB 0 0
9 Locked 256 QAM 8 765000000 Hz 0.8 dBmV 36.8 dB 0 0
10 Locked 256 QAM 25 117000000 Hz 6.6 dBmV 38.5 dB 0 0
11 Locked 256 QAM 26 123000000 Hz 6.6 dBmV 38.4 dB 0 0
12 Locked 256 QAM 27 129000000 Hz 6.6 dBmV 38.5 dB 0 0
13 Locked 256 QAM 28 135000000 Hz 6.4 dBmV 38.9 dB 0 0
14 Locked 256 QAM 29 141000000 Hz 6.2 dBmV 39 dB 0 0
15 Locked 256 QAM 30 147000000 Hz 6.2 dBmV 38.8 dB 0 0
16 Locked 256 QAM 31 153000000 Hz 6 dBmV 38.5 dB 0 0
17 Locked 256 QAM 32 159000000 Hz 6.4 dBmV 38.7 dB 0 0
18 Locked 256 QAM 33 165000000 Hz 6.6 dBmV 38.8 dB 0 0
19 Locked 256 QAM 34 171000000 Hz 6.7 dBmV 39 dB 0 0
20 Locked 256 QAM 35 177000000 Hz 7.3 dBmV 39.3 dB 0 0
21 Locked 256 QAM 36 183000000 Hz 7.5 dBmV 39.5 dB 0 0
22 Locked 256 QAM 37 189000000 Hz 7.7 dBmV 39.4 dB 0 0
23 Locked 256 QAM 38 195000000 Hz 8.1 dBmV 39.5 dB 0 0
24 Locked 256 QAM 39 201000000 Hz 8.6 dBmV 39.4 dB 0 0
25 Locked 256 QAM 41 213000000 Hz 9.3 dBmV 39.4 dB 0 0
26 Locked 256 QAM 42 219000000 Hz 9.5 dBmV 39.6 dB 0 0
27 Locked 256 QAM 43 225000000 Hz 9.5 dBmV 40.2 dB 0 0
28 Locked 256 QAM 44 231000000 Hz 9.5 dBmV 40.3 dB 0 0
29 Locked 256 QAM 40 207000000 Hz 9 dBmV 39.3 dB 0 0
30 Locked 256 QAM 46 243000000 Hz 9.8 dBmV 40.5 dB 0 0
31 Locked 256 QAM 47 249000000 Hz 9.9 dBmV 40.4 dB 0 0
32 Locked 256 QAM 48 255000000 Hz 10.1 dBmV 40.3 dB 0 0
Ok, looks like you have some channels that are getting too much power. Any over +7dbm is too much:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Might ask the ISP to get a -3 or -6dbm coax cable attenuator installed.
Power is all over the place. Should be more constant in between the 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.
Have the ISP check the signal and line quality UP to the modem.
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://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
Thank you for the insights. Is this why my cable connection has a status of "poor". All has been fine. What can lead up to the spikes in the power as you say. And when they already provisioned my modem why would they do it again?
Something to just check. Storms can bring issue into the mix. If it was working well before the storm and problem started during or after, most likely something up on the line from the modem. Something they will have to check.