Netgear CM1000 Intermittent Daily Connectivity

Have been experiencing some consistenent (daily) intermittent connectivity. Searching based off the logs from the modem it would seem most issues are with some of the bonded channels running hot.

Logs repeadetly spam Event Type Code: 20 and 22 but I'm having a hard time finding documentation that coved the event type codes.

Posting here in hopes that someone can help me fill in the blanks for a resolution.

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	525000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enable	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR / MER	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	QAM256	20	525000000 Hz	7.2 dBmV	42.5 dB	2199444205	3	0
2	Locked	QAM256	8	447000000 Hz	7.6 dBmV	42.6 dB	2198291868	19	0
3	Locked	QAM256	9	453000000 Hz	7.4 dBmV	42.5 dB	2198295788	2	0
4	Locked	QAM256	10	459000000 Hz	7.3 dBmV	42.5 dB	2198295838	2	0
5	Locked	QAM256	11	465000000 Hz	7.2 dBmV	42.4 dB	2198304405	2	0
6	Locked	QAM256	12	471000000 Hz	7.3 dBmV	42.4 dB	2198302480	4	0
7	Locked	QAM256	13	477000000 Hz	7.3 dBmV	42.4 dB	2198309056	0	0
8	Locked	QAM256	14	483000000 Hz	7.6 dBmV	42.5 dB	2198316039	0	0
9	Locked	QAM256	15	489000000 Hz	7.6 dBmV	42.6 dB	2198362964	2	0
10	Locked	QAM256	16	495000000 Hz	8.1 dBmV	42.7 dB	2198365220	3	0
11	Locked	QAM256	17	507000000 Hz	8.2 dBmV	42.7 dB	2198367458	0	0
12	Locked	QAM256	18	513000000 Hz	7.5 dBmV	42.6 dB	2198370287	5	0
13	Locked	QAM256	19	519000000 Hz	7.6 dBmV	42.6 dB	2198377890	6	0
14	Locked	QAM256	21	531000000 Hz	7.3 dBmV	42.4 dB	2198379135	3	0
15	Locked	QAM256	22	537000000 Hz	7.1 dBmV	42.5 dB	2198386874	7	0
16	Locked	QAM256	23	543000000 Hz	7.1 dBmV	42.4 dB	2198388289	11	0
17	Locked	QAM256	24	549000000 Hz	7.1 dBmV	42.4 dB	2198533904	7	0
18	Locked	QAM256	25	555000000 Hz	7.1 dBmV	42.5 dB	2198534260	5	0
19	Locked	QAM256	26	561000000 Hz	7.3 dBmV	42.4 dB	2198537254	3	0
20	Locked	QAM256	27	567000000 Hz	7.3 dBmV	42.3 dB	2198546417	4	0
21	Locked	QAM256	28	573000000 Hz	7.5 dBmV	42.3 dB	2198539883	9	0
22	Locked	QAM256	29	579000000 Hz	7.4 dBmV	42.3 dB	2198551937	6	0
23	Locked	QAM256	30	585000000 Hz	7.5 dBmV	42.3 dB	2198552115	3	0
24	Locked	QAM256	31	591000000 Hz	7.1 dBmV	42.2 dB	2198563305	11	0
25	Locked	QAM256	32	597000000 Hz	7.4 dBmV	42.1 dB	2198566919	12	0
26	Locked	QAM256	33	603000000 Hz	6.8 dBmV	41.8 dB	2198561341	22	0
27	Locked	QAM256	34	609000000 Hz	7.0 dBmV	41.9 dB	2198573421	16	0
28	Locked	QAM256	35	615000000 Hz	6.6 dBmV	41.8 dB	2198566191	13	0
29	Locked	QAM256	36	621000000 Hz	7.0 dBmV	41.8 dB	2198584267	5	0
30	Locked	QAM256	37	627000000 Hz	6.8 dBmV	41.6 dB	2198585365	8	0
31	Locked	QAM256	38	633000000 Hz	7.0 dBmV	41.6 dB	2198583413	8	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0	0

Upstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power
1	Locked	ATDMA	1	19300000 Hz	48.0 dBmV
2	Locked	ATDMA	2	25700000 Hz	48.3 dBmV
3	Locked	ATDMA	3	32300000 Hz	48.8 dBmV
4	Locked	ATDMA	4	38700000 Hz	49.5 dBmV
5	Not Locked	Unknown	0	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Hz	0.0 dBmV
8	Not Locked	Unknown	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	48	850000000 Hz	3.8 dBmV	38.5 dB	1108 ~ 2987	8457828872	8117812284	12
2	Not Locked	0	0	0 Hz	8.3 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	Unknown	0	0 Hz	0 dBmV
2	Not Locked	Unknown	0	0 Hz	0 dBmV

Time	Priority	Description
2020-12-22, 14:47:03	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 14:46:17	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 14:46:06	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 14:45:17	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:55:57	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:54:47	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:25:46	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:21:04	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:19:40	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:19:15	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:17:29	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:17:00	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:16:38	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:15:54	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:13:49	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:13:25	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:12:09	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;
2020-12-22, 10:11:43	Notice (6)	CM-STATUS message sent. Event Type Code: 20; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=b0:b9:8a:b0:38:78;CMTS-MAC=00:01:5c:65:74:76;CM-QOS=1.1;CM-VER=3.1;

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Responses

EG

Expert

•

111.4K Messages

5 years ago

The downstream power is not too hot. It's borderline in spec. It's the upstream power that is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

Your Home Network

adhocadhoc

Netgear CM1000 Intermittent Daily Connectivity

EG

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