Poor (high) signal levels

What can I do about this on my home network?

Signal levels have been increasing over several weeks to the point now where all of the channels are our of spec.

Nothing has changed inside my home. There are two splitters in the line. They have been there for over a year and have not been touched since installed.

ANTRONIX®

2-WAY SPLITTER 5-1002MHz
CMC2002H-A

-3.5dB
OUT

My owned modem = Netgear Nighthawk CM3000

Firmware = V6.01.04

Cable Diagnostic
Status: Poor
Action: [Downstream Power Level]
CM Status:
Downstream Status:
Upstream Status:
	Refresh Save Cable Diagnostic Info

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	411000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	4	411000000 Hz	13.1 dBmV	38.3 dB	741	0
2	Locked	QAM256	1	393000000 Hz	12.8 dBmV	38.3 dB	418	0
3	Locked	QAM256	2	399000000 Hz	13.0 dBmV	38.4 dB	517	0
4	Locked	QAM256	3	405000000 Hz	13.0 dBmV	38.4 dB	621	0
5	Locked	QAM256	5	417000000 Hz	13.3 dBmV	38.3 dB	872	0
6	Locked	QAM256	6	423000000 Hz	13.0 dBmV	38.3 dB	1044	0
7	Locked	QAM256	7	435000000 Hz	13.2 dBmV	38.2 dB	1301	0
8	Locked	QAM256	8	441000000 Hz	13.0 dBmV	38.2 dB	1507	0
9	Locked	QAM256	9	447000000 Hz	13.3 dBmV	38.3 dB	1805	0
10	Locked	QAM256	10	453000000 Hz	13.4 dBmV	38.3 dB	1957	0
11	Locked	QAM256	11	459000000 Hz	13.4 dBmV	38.4 dB	2003	0
12	Locked	QAM256	12	465000000 Hz	13.6 dBmV	38.3 dB	2535	0
13	Locked	QAM256	13	471000000 Hz	13.4 dBmV	38.1 dB	3202	0
14	Locked	QAM256	14	477000000 Hz	13.6 dBmV	38.1 dB	3741	0
15	Locked	QAM256	15	483000000 Hz	13.6 dBmV	38.0 dB	4453	0
16	Locked	QAM256	16	489000000 Hz	13.1 dBmV	37.9 dB	5210	0
17	Locked	QAM256	17	495000000 Hz	13.1 dBmV	37.8 dB	6745	0
18	Locked	QAM256	18	507000000 Hz	12.6 dBmV	37.6 dB	10206	0
19	Locked	QAM256	19	513000000 Hz	12.9 dBmV	37.6 dB	10658	0
20	Locked	QAM256	20	519000000 Hz	12.9 dBmV	37.6 dB	11139	0
21	Locked	QAM256	21	525000000 Hz	12.9 dBmV	37.5 dB	12232	0
22	Locked	QAM256	22	531000000 Hz	13.2 dBmV	37.3 dB	14025	0
23	Locked	QAM256	23	537000000 Hz	12.9 dBmV	37.4 dB	16868	0
24	Locked	QAM256	24	543000000 Hz	12.8 dBmV	37.1 dB	18769	0
25	Locked	QAM256	25	549000000 Hz	12.4 dBmV	37.0 dB	22756	0
26	Locked	QAM256	26	555000000 Hz	12.1 dBmV	36.9 dB	29146	0
27	Locked	QAM256	27	561000000 Hz	12.1 dBmV	36.9 dB	36428	0
28	Locked	QAM256	28	567000000 Hz	12.0 dBmV	36.6 dB	43109	0
29	Locked	QAM256	29	573000000 Hz	12.1 dBmV	36.5 dB	51601	0
30	Locked	QAM256	30	579000000 Hz	12.2 dBmV	36.5 dB	60578	0
31	Locked	QAM256	31	585000000 Hz	11.9 dBmV	36.5 dB	70438	0
32	Locked	QAM256	32	591000000 Hz	12.0 dBmV	36.5 dB	76208	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	38.8 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	22800000 Hz	35.8 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29200000 Hz	35.8 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	36.5 dBmV
5	Locked	ATDMA	1	5120 Ksym/sec	16400000 Hz	35.8 dBmV
6	Not Locked	Unknown	0	0	0	0.0 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	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	672000000 Hz	10.48 dBmV	34.3 dB	1108 ~ 2987	1690853036	1593696019	108
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:Sat Oct 10 07:58:24 2026

System Up Time:1 day 01:38:11

Responses

Oldest First

Selected Oldest First

EG

Expert

•

122K Messages

2 days ago

First. Are you actually experiencing any connection/droput problems ?

EG

Expert

•

122K Messages

3 hours ago

@vadeltachi @XfinityAngie

Please circle back here and post any possible solutions for the issue here in these open public forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.

Your Home Network

vadeltachi

Poor (high) signal levels

EG

EG

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