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Tue, Dec 22, 2020 6:00 PM

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
ProcedureStatusComment
Acquire Downstream Channel525000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25620525000000 Hz7.2 dBmV42.5 dB219944420530
2LockedQAM2568447000000 Hz7.6 dBmV42.6 dB2198291868190
3LockedQAM2569453000000 Hz7.4 dBmV42.5 dB219829578820
4LockedQAM25610459000000 Hz7.3 dBmV42.5 dB219829583820
5LockedQAM25611465000000 Hz7.2 dBmV42.4 dB219830440520
6LockedQAM25612471000000 Hz7.3 dBmV42.4 dB219830248040
7LockedQAM25613477000000 Hz7.3 dBmV42.4 dB219830905600
8LockedQAM25614483000000 Hz7.6 dBmV42.5 dB219831603900
9LockedQAM25615489000000 Hz7.6 dBmV42.6 dB219836296420
10LockedQAM25616495000000 Hz8.1 dBmV42.7 dB219836522030
11LockedQAM25617507000000 Hz8.2 dBmV42.7 dB219836745800
12LockedQAM25618513000000 Hz7.5 dBmV42.6 dB219837028750
13LockedQAM25619519000000 Hz7.6 dBmV42.6 dB219837789060
14LockedQAM25621531000000 Hz7.3 dBmV42.4 dB219837913530
15LockedQAM25622537000000 Hz7.1 dBmV42.5 dB219838687470
16LockedQAM25623543000000 Hz7.1 dBmV42.4 dB2198388289110
17LockedQAM25624549000000 Hz7.1 dBmV42.4 dB219853390470
18LockedQAM25625555000000 Hz7.1 dBmV42.5 dB219853426050
19LockedQAM25626561000000 Hz7.3 dBmV42.4 dB219853725430
20LockedQAM25627567000000 Hz7.3 dBmV42.3 dB219854641740
21LockedQAM25628573000000 Hz7.5 dBmV42.3 dB219853988390
22LockedQAM25629579000000 Hz7.4 dBmV42.3 dB219855193760
23LockedQAM25630585000000 Hz7.5 dBmV42.3 dB219855211530
24LockedQAM25631591000000 Hz7.1 dBmV42.2 dB2198563305110
25LockedQAM25632597000000 Hz7.4 dBmV42.1 dB2198566919120
26LockedQAM25633603000000 Hz6.8 dBmV41.8 dB2198561341220
27LockedQAM25634609000000 Hz7.0 dBmV41.9 dB2198573421160
28LockedQAM25635615000000 Hz6.6 dBmV41.8 dB2198566191130
29LockedQAM25636621000000 Hz7.0 dBmV41.8 dB219858426750
30LockedQAM25637627000000 Hz6.8 dBmV41.6 dB219858536580
31LockedQAM25638633000000 Hz7.0 dBmV41.6 dB219858341380
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

Upstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA119300000 Hz48.0 dBmV
2LockedATDMA225700000 Hz48.3 dBmV
3LockedATDMA332300000 Hz48.8 dBmV
4LockedATDMA438700000 Hz49.5 dBmV
5Not LockedUnknown00 Hz0.0 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

Downstream OFDM Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 348850000000 Hz3.8 dBmV38.5 dB1108 ~ 29878457828872811781228412
2Not Locked000 Hz8.3 dBmV0.0 dB0 ~ 4095000

Upstream OFDMA Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV

 

TimePriorityDescription
2020-12-22, 14:47:03Notice (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, 14:46:17Notice (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, 14:46:06Notice (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, 14:45:17Notice (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, 10:55:57Notice (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, 10:54:47Notice (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, 10:25:46Notice (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, 10:21:04Notice (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, 10:19:40Notice (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, 10:19:15Notice (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, 10:17:29Notice (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, 10:17:00Notice (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, 10:16:38Notice (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, 10:15:54Notice (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, 10:13:49Notice (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, 10:13:25Notice (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, 10:12:09Notice (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, 10:11:43Notice (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;

Responses

EG

Expert

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87.1K Messages

6 m 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.

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