CAX30 - Intermittent Internet | NETGEAR Communities

dave8

Aspirant

Apr 21, 2023

I'm not sure I understand. I'm on the cable connection status page on my router, but when I right click there is no

selection to copy (as Text) of the entire page.

Cable Connection

Cancel Apply

Cable Diagnostic

Status: Poor

Action:
[Downstream Power Level]
Try these actions (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary http://192.168.1.1/splitter.php.
3) Replace any required http://192.168.1.1/splitter.php.
4) Contact your service provider for troubleshooting help.

Internet Access:

Downstream Status:

Upstream Status:

Refresh Save Cable Diagnostic Info

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

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure	Status	Comment
Acquire Downstream Channel	651000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectabables
1	Locked	256 QAM	44	651000000 Hz	-12.2 dBmV	37.6 dB	0	0
2	Locked	256 QAM	17	483000000 Hz	-11.6 dBmV	38.2 dB	0	0
3	Locked	256 QAM	18	489000000 Hz	-11.4 dBmV	38.2 dB	0	0
4	Locked	256 QAM	19	495000000 Hz	-11.2 dBmV	38.2 dB	0	0
5	Locked	256 QAM	20	507000000 Hz	-11.0 dBmV	38.3 dB	1	0
6	Locked	256 QAM	21	513000000 Hz	-11.1 dBmV	38.2 dB	1	0
7	Locked	256 QAM	22	519000000 Hz	-11.0 dBmV	38.2 dB	2	0
8	Locked	256 QAM	23	525000000 Hz	-11.1 dBmV	38.2 dB	2	0
9	Locked	256 QAM	24	531000000 Hz	-11.2 dBmV	38.1 dB	1	0
10	Locked	256 QAM	25	537000000 Hz	-11.3 dBmV	38.1 dB	16	27
11	Locked	256 QAM	26	543000000 Hz	-11.2 dBmV	38.2 dB	23	11
12	Locked	256 QAM	27	549000000 Hz	-11.3 dBmV	38.1 dB	0	0
13	Locked	256 QAM	28	555000000 Hz	-11.8 dBmV	37.9 dB	0	0
14	Locked	256 QAM	29	561000000 Hz	-11.5 dBmV	38.0 dB	0	0
15	Locked	256 QAM	30	567000000 Hz	-11.6 dBmV	38.0 dB	0	0
16	Locked	256 QAM	31	573000000 Hz	-11.5 dBmV	38.0 dB	0	0
17	Locked	256 QAM	32	579000000 Hz	-11.5 dBmV	38.0 dB	0	0
18	Locked	256 QAM	33	585000000 Hz	-11.6 dBmV	38.0 dB	0	0
19	Locked	256 QAM	34	591000000 Hz	-11.7 dBmV	38.0 dB	0	0
20	Locked	256 QAM	35	597000000 Hz	-11.6 dBmV	38.0 dB	0	0
21	Locked	256 QAM	36	603000000 Hz	-11.6 dBmV	38.0 dB	0	0
22	Locked	256 QAM	37	609000000 Hz	-11.8 dBmV	37.9 dB	0	0
23	Locked	256 QAM	38	615000000 Hz	-12.0 dBmV	37.8 dB	0	0
24	Locked	256 QAM	39	621000000 Hz	-11.7 dBmV	37.9 dB	0	0
25	Locked	256 QAM	40	627000000 Hz	-11.9 dBmV	37.9 dB	0	0
26	Locked	256 QAM	41	633000000 Hz	-12.0 dBmV	37.9 dB	0	0
27	Locked	256 QAM	42	639000000 Hz	-12.3 dBmV	37.7 dB	0	0
28	Locked	256 QAM	43	645000000 Hz	-12.1 dBmV	37.8 dB	0	0
29	Locked	256 QAM	45	657000000 Hz	-11.9 dBmV	37.8 dB	0	0
30	Locked	256 QAM	46	663000000 Hz	-11.7 dBmV	37.9 dB	0	0
31	Locked	256 QAM	47	669000000 Hz	-11.7 dBmV	38.0 dB	0	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	73	5120 Ksym/sec	16400000 Hz	48.8 dBmV
2	Locked	ATDMA	74	5120 Ksym/sec	22800000 Hz	48.8 dBmV
3	Locked	ATDMA	75	5120 Ksym/sec	29200000 Hz	48.5 dBmV
4	Locked	ATDMA	76	5120 Ksym/sec	35600000 Hz	48.3 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

Channel	Channel ID	Frequency	Power	SNR/MER	Active Subcarrier Number Range	Total Codewords	Uncorrectable Codewords
1	48	688000000 Hz	-11.7 dBmV	36.8 dB	1108 ~ 2987	1107000560	20
2	0	0 Hz	0 dBmV	0 dB	0 ~ 0	0	0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel	UpstreamIsMuted	Ranging Status	Subcarrier Zero Frequency	Active Subcarrier Number Range	Symbols Per Frame	Tx Power
1		Other	0 MHz	0 ~ 0	0	0 dBmV
2		Other	0 MHz	0 ~ 0	0	0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time: 2023-04-21 13:50:03

System Up Time: 3Days, 16:44:29

FURRYe38
Guru - Experienced User
Apr 21, 2023
Thats good.

So the power levels on the modem are below specs:

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

Please ask the ISP to raise the power.

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.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
- dave8
  Aspirant
  Apr 27, 2023
  Looks like this may be stable now. I had my ISP check the items you mentioned and they did something to correct the problem.
  - FURRYe38
    Guru - Experienced User
    Apr 28, 2023
    Glad they got it working. Please mark your thread as solved so others will know. Be sure to save off a back up configuration to file for safe keeping. Saves time if a reset is needed.
    https://kb.netgear.com/24231/How-do-I-back-up-the-router-configuration-settings-on-my-Nighthawk-router
    Enjoy. 📡

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CAX30 - Intermittent Internet