2-3 times a day my connection says "no internet" even thought all the lights are solid green on my CM1000 modem. I have a red light on my router for the incoming internet signal. Rebooting the modem works 'most' of the time but this happens multiple times a day. When I checked the event log on the modem, I received the following list of critical events. I dont know what to do with this information. Ive called Xfinity a couple times and they tell me the line is strong. They send a reset code over and resetting it works for a while. Not much help there. Any ideas? 2023-06-08, 13:09:03Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-08, 13:09:03Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-08, 13:08:50Notice (6)Honoring MDD; IP provisioning mode = IPv62023-06-08, 13:08:45Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-07, 00:10:40Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-07, 00:10:22Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-06, 00:55:51Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-06, 00:55:32Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-05, 19:26:32Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-05, 19:26:15Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-03, 02:14:15Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-03, 02:13:57Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 20:29:36Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 20:29:18Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 20:28:24Critical (3)Resetting the cable modem due to docsDevResetNow2023-06-01, 12:58:39Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 12:58:21Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 12:51:31Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 12:51:11Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 12:25:43Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 12:25:24Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 12:24:20Critical (3)Resetting the cable modem due to docsDevResetNow2023-06-01, 11:55:43Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 11:55:23Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 00:21:29Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-06-01, 00:21:10Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2023-05-31, 01:14:39Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;2023-05-31, 01:14:19Critical (3)UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;

Modem Status: Hardware Version 2.02 Firmware Version V10.01.07 Cable Modem Serial Number CM certificate Installed CM MAC

Cable Connection: Frequency start ValueThis 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>ProcedureStatusCommentAcquire Downstream Channel675000000 HzLockedConnectivity StateOKOperationalBoot StateOKOperationalSecurityEnableBPI+IP Provisioning ModeHonor MDDIPv6 only<tabindex=-1>Downstream Bonded Channels</tabindex=-1>ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords1LockedQAM25644675000000 Hz6.4 dBmV42.8 dB235288719102LockedQAM25613489000000 Hz7.1 dBmV45.6 dB234440776103LockedQAM25614495000000 Hz7.1 dBmV45.5 dB234441973104LockedQAM25615501000000 Hz7.1 dBmV45.4 dB234445647005LockedQAM25616507000000 Hz7.0 dBmV45.4 dB234449245106LockedQAM25617513000000 Hz6.9 dBmV45.4 dB234436681107LockedQAM25618519000000 Hz6.8 dBmV45.2 dB234457056208LockedQAM25619525000000 Hz6.8 dBmV45.2 dB234460945109LockedQAM25620531000000 Hz6.6 dBmV45.2 dB2344645861010LockedQAM25621537000000 Hz6.5 dBmV45.0 dB2344689471011LockedQAM25622543000000 Hz6.4 dBmV45.0 dB2344725701012LockedQAM25623549000000 Hz6.2 dBmV44.8 dB2344762271013LockedQAM25624555000000 Hz6.3 dBmV44.9 dB2344803960014LockedQAM25625561000000 Hz6.3 dBmV44.8 dB2344838111015LockedQAM25626567000000 Hz6.3 dBmV44.7 dB2344876001016LockedQAM25627573000000 Hz6.3 dBmV44.8 dB2344918811017LockedQAM25628579000000 Hz6.5 dBmV44.8 dB2344956451018LockedQAM25629585000000 Hz6.5 dBmV44.7 dB2344987870019LockedQAM25630591000000 Hz6.5 dBmV44.9 dB2345030116020LockedQAM25631597000000 Hz6.6 dBmV44.8 dB2345084467021LockedQAM25632603000000 Hz6.6 dBmV44.8 dB2345121640022LockedQAM25633609000000 Hz6.5 dBmV44.6 dB2345160281023LockedQAM25634615000000 Hz6.5 dBmV44.6 dB2345195821024LockedQAM25635621000000 Hz6.5 dBmV44.6 dB2345234511025LockedQAM25636627000000 Hz6.4 dBmV44.8 dB2345269471026LockedQAM25637633000000 Hz6.3 dBmV44.5 dB2345309661027LockedQAM25638639000000 Hz6.2 dBmV44.4 dB2345346641028LockedQAM25639645000000 Hz6.2 dBmV44.2 dB2345381242029LockedQAM25640651000000 Hz6.2 dBmV44.4 dB2345419252030LockedQAM25641657000000 Hz6.3 dBmV44.4 dB2345442431031LockedQAM25642663000000 Hz6.4 dBmV44.4 dB2345476781032LockedQAM25643669000000 Hz6.3 dBmV44.4 dB23455173410<tabindex=-1>Upstream Bonded Channels</tabindex=-1>ChannelLock StatusModulationChannel IDFrequencyPower1LockedATDMA1716400000 Hz44.8 dBmV2LockedATDMA1822800000 Hz45.0 dBmV3LockedATDMA1929200000 Hz45.0 dBmV4LockedATDMA2035600000 Hz45.5 dBmV5Not LockedUnknown00 Hz0.0 dBmV6Not LockedUnknown00 Hz0.0 dBmV7Not LockedUnknown00 Hz0.0 dBmV8Not LockedUnknown00 Hz0.0 dBmV<tabindex=-1>Downstream OFDM Channels</tabindex=-1>ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords1Locked0, 1, 2, 3193957000000 Hz4.2 dBmV41.0 dB148 ~ 3947525450522012295602Not Locked000 Hz4.0 dBmV0.0 dB0 ~ 4095000<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower1Not LockedUnknown00 Hz0 dBmV2Not LockedUnknown00 Hz0 dBmVCurrent System Time: Thu Jun 08 07:35:07 2023System Up Time: 1:26:56

...also... I don't have any splitters, attenuators, amplifiers or extended runs ... straight run from wall to modem, modem to router.

Ok, power leves are on the high side and a few channels are near the high max value. Might ask the ISP to reduce this by just a bit: https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router There is some minor correctables on the down side but not aweful. Mostly should be zeros seen here. However you have a ton of correctables on the UP side channel 1 which should be zero. The modem is doing over time for unknown reasons on this channel. 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. 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.Be sure to power OFF the modem for 1 minute then back ON.https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.htmlhttps://highspeed.tips/docsis-events/

Forum Discussion

ksk2175

Aspirant

Jun 08, 2023

Critical Events on CM1000 - Drop of Internet Multiple time Daily (Xfinity)

2-3 times a day my connection says "no internet" even thought all the lights are solid green on my CM1000 modem. I have a red light on my router for the incoming internet signal. Rebooting the modem works 'most' of the time but this happens multiple times a day. When I checked the event log on the modem, I received the following list of critical events. I dont know what to do with this information. Ive called Xfinity a couple times and they tell me the line is strong. They send a reset code over and resetting it works for a while. Not much help there. Any ideas?

2023-06-08, 13:09:03	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-08, 13:09:03	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-08, 13:08:50	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
2023-06-08, 13:08:45	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-07, 00:10:40	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-07, 00:10:22	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-06, 00:55:51	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-06, 00:55:32	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-05, 19:26:32	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-05, 19:26:15	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-03, 02:14:15	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-03, 02:13:57	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 20:29:36	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 20:29:18	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 20:28:24	Critical (3)	Resetting the cable modem due to docsDevResetNow
2023-06-01, 12:58:39	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 12:58:21	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 12:51:31	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 12:51:11	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 12:25:43	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 12:25:24	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 12:24:20	Critical (3)	Resetting the cable modem due to docsDevResetNow
2023-06-01, 11:55:43	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 11:55:23	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 00:21:29	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-06-01, 00:21:10	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-05-31, 01:14:39	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;
2023-05-31, 01:14:19	Critical (3)	UCD invalid or channel unusable;CM-MAC=9c:c9:eb:94:96:88;CMTS-MAC=00:90:f0:77:02:00;CM-QOS=1.1;CM-VER=3.1;

Hardware

Troubleshooting

11 Replies

FURRYe38

Guru - Experienced User

Jun 08, 2023

Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router

Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.

ksk2175
Aspirant
Jun 08, 2023
Modem Status:

Hardware Version 2.02

Firmware Version V10.01.07

Cable Modem Serial Number

CM certificate Installed

CM MAC

ksk2175

Aspirant

Jun 08, 2023

Cable Connection:

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	675000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enable	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

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

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR / MER	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	QAM256	44	675000000 Hz	6.4 dBmV	42.8 dB	235288719	1	0
2	Locked	QAM256	13	489000000 Hz	7.1 dBmV	45.6 dB	234440776	1	0
3	Locked	QAM256	14	495000000 Hz	7.1 dBmV	45.5 dB	234441973	1	0
4	Locked	QAM256	15	501000000 Hz	7.1 dBmV	45.4 dB	234445647	0	0
5	Locked	QAM256	16	507000000 Hz	7.0 dBmV	45.4 dB	234449245	1	0
6	Locked	QAM256	17	513000000 Hz	6.9 dBmV	45.4 dB	234436681	1	0
7	Locked	QAM256	18	519000000 Hz	6.8 dBmV	45.2 dB	234457056	2	0
8	Locked	QAM256	19	525000000 Hz	6.8 dBmV	45.2 dB	234460945	1	0
9	Locked	QAM256	20	531000000 Hz	6.6 dBmV	45.2 dB	234464586	1	0
10	Locked	QAM256	21	537000000 Hz	6.5 dBmV	45.0 dB	234468947	1	0
11	Locked	QAM256	22	543000000 Hz	6.4 dBmV	45.0 dB	234472570	1	0
12	Locked	QAM256	23	549000000 Hz	6.2 dBmV	44.8 dB	234476227	1	0
13	Locked	QAM256	24	555000000 Hz	6.3 dBmV	44.9 dB	234480396	0	0
14	Locked	QAM256	25	561000000 Hz	6.3 dBmV	44.8 dB	234483811	1	0
15	Locked	QAM256	26	567000000 Hz	6.3 dBmV	44.7 dB	234487600	1	0
16	Locked	QAM256	27	573000000 Hz	6.3 dBmV	44.8 dB	234491881	1	0
17	Locked	QAM256	28	579000000 Hz	6.5 dBmV	44.8 dB	234495645	1	0
18	Locked	QAM256	29	585000000 Hz	6.5 dBmV	44.7 dB	234498787	0	0
19	Locked	QAM256	30	591000000 Hz	6.5 dBmV	44.9 dB	234503011	6	0
20	Locked	QAM256	31	597000000 Hz	6.6 dBmV	44.8 dB	234508446	7	0
21	Locked	QAM256	32	603000000 Hz	6.6 dBmV	44.8 dB	234512164	0	0
22	Locked	QAM256	33	609000000 Hz	6.5 dBmV	44.6 dB	234516028	1	0
23	Locked	QAM256	34	615000000 Hz	6.5 dBmV	44.6 dB	234519582	1	0
24	Locked	QAM256	35	621000000 Hz	6.5 dBmV	44.6 dB	234523451	1	0
25	Locked	QAM256	36	627000000 Hz	6.4 dBmV	44.8 dB	234526947	1	0
26	Locked	QAM256	37	633000000 Hz	6.3 dBmV	44.5 dB	234530966	1	0
27	Locked	QAM256	38	639000000 Hz	6.2 dBmV	44.4 dB	234534664	1	0
28	Locked	QAM256	39	645000000 Hz	6.2 dBmV	44.2 dB	234538124	2	0
29	Locked	QAM256	40	651000000 Hz	6.2 dBmV	44.4 dB	234541925	2	0
30	Locked	QAM256	41	657000000 Hz	6.3 dBmV	44.4 dB	234544243	1	0
31	Locked	QAM256	42	663000000 Hz	6.4 dBmV	44.4 dB	234547678	1	0
32	Locked	QAM256	43	669000000 Hz	6.3 dBmV	44.4 dB	234551734	1	0

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

Channel	Lock Status	Modulation	Channel ID	Frequency	Power
1	Locked	ATDMA	17	16400000 Hz	44.8 dBmV
2	Locked	ATDMA	18	22800000 Hz	45.0 dBmV
3	Locked	ATDMA	19	29200000 Hz	45.0 dBmV
4	Locked	ATDMA	20	35600000 Hz	45.5 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

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

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	193	957000000 Hz	4.2 dBmV	41.0 dB	148 ~ 3947	52545052	20122956	0
2	Not Locked	0	0	0 Hz	4.0 dBmV	0.0 dB	0 ~ 4095	0	0	0

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

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

Current System Time: Thu Jun 08 07:35:07 2023System Up Time: 1:26:56

ksk2175
Aspirant
Jun 08, 2023
...also... I don't have any splitters, attenuators, amplifiers or extended runs ... straight run from wall to modem, modem to router.

Hardware Version	2.02

Firmware Version	V10.01.07

Cable Modem Serial Number

CM certificate	Installed

CM MAC