Model CAX80 router upstream LED blinking.

I have a Model CAX80 router and have been having problems streaming at certain times of day due to the signal dropping out. I had Xfinity out and the tech put in a MOCA filter to isolate our syst...

Gbol

Aspirant

Nov 12, 2023

Cable Connection

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:

Downstream Status:

Upstream Status:

Advanced Information

Frequency Start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	435 MHz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	256 QAM	4	435000000 Hz	3.8 dBmV	42.8 dB	0	0
2	Locked	256 QAM	1	417000000 Hz	3.7 dBmV	42.9 dB	0	0
3	Locked	256 QAM	2	423000000 Hz	3.7 dBmV	42.8 dB	0	0
4	Locked	256 QAM	3	429000000 Hz	3.8 dBmV	42.8 dB	0	0
5	Locked	256 QAM	5	441000000 Hz	3.8 dBmV	42.8 dB	0	0
6	Locked	256 QAM	6	447000000 Hz	3.9 dBmV	42.8 dB	0	0
7	Locked	256 QAM	7	453000000 Hz	4.0 dBmV	42.7 dB	0	0
8	Locked	256 QAM	8	459000000 Hz	3.9 dBmV	42.7 dB	0	0
9	Locked	256 QAM	9	465000000 Hz	3.9 dBmV	42.6 dB	0	0
10	Locked	256 QAM	10	471000000 Hz	3.9 dBmV	42.6 dB	0	0
11	Locked	256 QAM	11	477000000 Hz	3.8 dBmV	42.5 dB	0	0
12	Locked	256 QAM	12	483000000 Hz	3.7 dBmV	42.4 dB	0	0
13	Locked	256 QAM	13	489000000 Hz	3.7 dBmV	42.3 dB	0	0
14	Locked	256 QAM	14	495000000 Hz	3.7 dBmV	42.3 dB	0	0
15	Locked	256 QAM	15	501000000 Hz	3.9 dBmV	42.3 dB	0	0
16	Locked	256 QAM	16	507000000 Hz	4.1 dBmV	42.4 dB	0	0
17	Locked	256 QAM	17	513000000 Hz	4.2 dBmV	42.4 dB	0	0
18	Locked	256 QAM	18	519000000 Hz	4.4 dBmV	42.4 dB	0	0
19	Locked	256 QAM	19	525000000 Hz	4.4 dBmV	42.4 dB	0	0
20	Locked	256 QAM	20	531000000 Hz	4.5 dBmV	42.3 dB	0	0
21	Locked	256 QAM	21	537000000 Hz	4.5 dBmV	42.2 dB	0	0
22	Locked	256 QAM	22	543000000 Hz	4.4 dBmV	42.1 dB	0	0
23	Locked	256 QAM	23	555000000 Hz	4.5 dBmV	42.1 dB	0	0
24	Locked	256 QAM	24	561000000 Hz	4.6 dBmV	42.1 dB	0	0
25	Locked	256 QAM	25	567000000 Hz	4.7 dBmV	42.2 dB	0	0
26	Locked	256 QAM	26	573000000 Hz	4.8 dBmV	42.2 dB	0	0
27	Locked	256 QAM	27	579000000 Hz	4.8 dBmV	42.3 dB	0	0
28	Locked	256 QAM	28	585000000 Hz	4.8 dBmV	42.3 dB	0	0
29	Locked	256 QAM	29	591000000 Hz	4.9 dBmV	42.3 dB	0	0
30	Locked	256 QAM	30	597000000 Hz	5.0 dBmV	42.3 dB	0	0
31	Locked	256 QAM	31	603000000 Hz	5.1 dBmV	42.3 dB	0	0
32	Locked	256 QAM	32	609000000 Hz	5.0 dBmV	42.2 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	5	2560 Ksym/sec	40400000 Hz	42.3 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	22800000 Hz	40.3 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29200000 Hz	39.8 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	39.0 dBmV
5	Locked	ATDMA	1	5120 Ksym/sec	16400000 Hz	40.3 dBmV
6	Locked	ATDMA	6	2560 Ksym/sec	10400000 Hz	44.0 dBmV
7	Not Locked	Unknown	0	0	0	0.0 dBmV
8	Not Locked	Unknown	0	0	0	0.0 dBmV

Downstream OFDM Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power	SNR / MER	Active Subcarrier Number Range	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	0 ,1 ,2 ,3	193	805000000 Hz	5.88 dBmV	42.3 dB	1108 ~ 2987	661618867	173420212	2
2	Not Locked	0	0	0 Hz	0 dBmV	0 dB	0 ~ 4095	0	0	0

Upstream OFDMA Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power
1	Not Locked	0	0	0 Hz	0 dBmV
2	Not Locked	0	0	0 Hz	0 dBmV

Extended Upstream Transmit Power

Current System Time:Sun Nov 12 09:38:28 2023

System Up Time:14:22:32

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FURRYe38

Guru - Experienced User

Nov 12, 2023

Power levels are good and no correctables or un-correctables.

However lots of Criticals. 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 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.html
https://highspeed.tips/docsis-events/

Gbol
Aspirant
Nov 13, 2023
Thanks`. A lot to process. The ISP provider was out and claimed that everything is fine on their end. He blamed the problems on a possibly failing modem. Xfinity here in Arizona is pretty bad, especially when it comes to service. Thanks to everyone who tried to help here. It is much appreciated.
- FURRYe38
  Guru - Experienced User
  Nov 13, 2023
  Might try the modem at a different location to see if problem follows or not. Would be telling.
  Ya, ISPs and some techs are not willing to take a deep dive and quick to blame NG. 🙄

Forum Discussion

Model CAX80 router upstream LED blinking.