Re: CM2000 blinking downstream light issue with log events

Puch96 · ‎2021-03-30

Hello.

I was wondering if anyone is experiencing an issue with Netgear CM2000 cable modem on Xfinity.

My downstream light will blink white. I do not have any connection issues, but I notice the following on the logs:

Time	Priority	Description
Tue Mar 30 11:05:14 2021	(Notice (6))	CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxxxx;CMTS-MAC=xxxxxxxxxx;CM-QOS=1.1;CM-VER=3.1;
Tue Mar 30 11:04:41 2021	(Notice (6))	CM-STATUS message sent. Event Type Code: 20; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.1;
Tue Mar 30 09:17:03 2021	(Notice (6))	CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.1;
Tue Mar 30 09:16:28 2021	(Notice (6))	CM-STATUS message sent. Event Type Code: 20; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxxx;CMTS-MAC=00:01:5c:71:9e:7c;CM-QOS=1.1;CM-VER=3.1;
Tue Mar 30 09:07:53 2021	(Notice (6))	CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.1;
Tue Mar 30 09:07:25 2021	(Notice (6))	CM-STATUS message sent. Event Type Code: 20; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.1;

Here is my channel info:

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	507000000 Hz	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	QAM256	5	507000000 Hz	-2.5 dBmV	40.6 dB	0	0
2	Locked	QAM256	2	489000000 Hz	-2.0 dBmV	40.7 dB	0	0
3	Locked	QAM256	3	495000000 Hz	-2.0 dBmV	40.7 dB	0	0
4	Locked	QAM256	4	501000000 Hz	-2.1 dBmV	40.7 dB	0	0
5	Locked	QAM256	6	513000000 Hz	-2.7 dBmV	40.5 dB	0	0
6	Locked	QAM256	7	519000000 Hz	-2.9 dBmV	40.4 dB	0	0
7	Locked	QAM256	8	525000000 Hz	-2.9 dBmV	40.5 dB	0	0
8	Locked	QAM256	9	531000000 Hz	-2.9 dBmV	40.5 dB	0	0
9	Locked	QAM256	10	537000000 Hz	-3.0 dBmV	40.4 dB	0	0
10	Locked	QAM256	11	543000000 Hz	-3.1 dBmV	40.4 dB	0	0
11	Locked	QAM256	12	549000000 Hz	-3.3 dBmV	40.2 dB	0	0
12	Locked	QAM256	13	555000000 Hz	-3.4 dBmV	40.2 dB	0	0
13	Locked	QAM256	14	561000000 Hz	-3.3 dBmV	40.2 dB	0	0
14	Locked	QAM256	15	567000000 Hz	-3.4 dBmV	40.0 dB	0	0
15	Locked	QAM256	16	573000000 Hz	-3.4 dBmV	40.0 dB	0	0
16	Locked	QAM256	17	579000000 Hz	-3.6 dBmV	40.0 dB	0	0
17	Locked	QAM256	18	585000000 Hz	-3.9 dBmV	39.9 dB	0	0
18	Locked	QAM256	19	591000000 Hz	-4.0 dBmV	39.8 dB	0	0
19	Locked	QAM256	20	597000000 Hz	-3.9 dBmV	39.9 dB	0	0
20	Locked	QAM256	21	603000000 Hz	-3.9 dBmV	39.9 dB	0	0
21	Locked	QAM256	22	609000000 Hz	-3.9 dBmV	39.9 dB	0	0
22	Locked	QAM256	23	615000000 Hz	-3.8 dBmV	39.9 dB	0	0
23	Locked	QAM256	24	621000000 Hz	-3.5 dBmV	40.0 dB	0	0
24	Locked	QAM256	25	627000000 Hz	-3.2 dBmV	40.2 dB	0	0
25	Locked	QAM256	26	633000000 Hz	-2.8 dBmV	40.3 dB	0	0
26	Locked	QAM256	27	639000000 Hz	-2.9 dBmV	40.1 dB	0	0
27	Locked	QAM256	28	645000000 Hz	-2.8 dBmV	40.1 dB	0	0
28	Locked	QAM256	29	651000000 Hz	-2.9 dBmV	40.2 dB	0	0
29	Locked	QAM256	30	657000000 Hz	-2.9 dBmV	40.2 dB	0	0
30	Locked	QAM256	31	663000000 Hz	-3.0 dBmV	40.1 dB	0	0
31	Locked	QAM256	32	669000000 Hz	-3.0 dBmV	40.1 dB	0	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	1	5120	35600000 Hz	48.0 dBmV
2	Locked	ATDMA	2	5120	29200000 Hz	46.8 dBmV
3	Locked	ATDMA	3	5120	22800000 Hz	46.8 dBmV
4	Locked	ATDMA	4	5120	16400000 Hz	45.8 dBmV
5	Locked	ATDMA	5	2560	40400000 Hz	47.3 dBmV
6	Not Locked	Unknown	0	0	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0	0 Hz	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	37	690000000 Hz	-2.5 dBmV	39.8 dB	1228 ~ 2867	354658314	353772407	2
2	Not Locked	0	0	0 Hz	0 dBmV	0.0 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

FURRYe38 · ‎2021-03-30

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.
Be sure to power OFF the modem for 1 minute them back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://highspeed.tips/docsis-events/

plemans · ‎2021-03-30

Your power levels look good and you don't have much for errors.

Your log indicates an issue with channel 37 (the ofdma channel). Code 20/22 indicates fec errors and resetting.

That could cause the downstream to blink as it searches to reconnect channel 37.

If its not causing a reduction in speed or issues, I wouldn't worry about it.

If you are running into issues, then see what @FURRYe38 advised.

Taurus2313 · ‎2021-03-31

I would love a response to my thread about the issues I am having with this modem. I have provided log screenshots in the thread. My downstream light constantly blinks as well.

FURRYe38 · ‎2021-04-29

Any progress on this?

@Taurus2313 wrote:
I would love a response to my thread about the issues I am having with this modem. I have provided log screenshots in the thread. My downstream light constantly blinks as well.