CM1100 Downstream light blinking

Question

I have a CM1100 Cable Modem with Xfinity and have giga plan with 1.2gb downloads and 35mb uploads. For some reason while back i started to get the second led from the top blinking witch is the "Downstream light blinking" led light. I have rebooted the modem, reset, also changed the slitter outside with the same one that xfinity technician put in, check the firmware for the modem witch looks to be the latest there is, also in the cable menu 192.168.100.1 it say status is good. Now not sure if there is a problem with the cables or the modem it self. Purchased the modem from costco around 2020-2021, somewhere there. I am attaching the stats if anyone can read those and can tell me what maybe my problem.

(Testing done with modem connected directly to my pc. I bypassed the wireless router.)

Video link with led blinking:

https://drive.google.com/file/d/1Wa-37tDItY3sx2eZFLIJC0R0qZBxkX_C/view?usp=sharing

My Wireless router i use is : ASUS RT-AX86U (AX5700)

Appreciated and thanks for your time.

FURRYe38 · Answer

What Firmware version is currently loaded?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-routerhttps://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
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FYI, the CM1100 isn't rated for 1.2Gb ISP speeds on the down to the WAN ports are only 1000Mpbs supporting. Your ISP had a 1Gb plan up until 2022 then they did a split and came up with 800Mpbs and a 1.2 Gb plan. I highly recommend you ask the ISP to change you to the 800Mpbs plan.&nbsp;

FURRYe38 · Answer

Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP.&nbsp;Indicates a signal issue on the ISP line up to the modem.
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Have the ISP check the signal and line quality UP to the modem.&nbsp;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.&nbsp;Be sure your using good quality RG6 coax cable up to the modem.&nbsp;Start with removing any amplifiers, signal attenuators, or splitters from the coax.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://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-routerhttps://www.duckware.com/tech/solving-intermittent-cable-modem-issues.htmlhttps://highspeed.tips/docsis-events/

nemtulea · Answer

&nbsp;&nbsp;TimePriorityDescription2024-01-08, 01:28:33Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2024-01-06, 01:19:28Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;CM-QOS=1.1;CM-VER=3.1;2024-01-06, 01:19:21Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2024-01-04, 13:52:56Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2024-01-03, 02:50:54Critical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;CM-QOS=1.1;CM-VER=3.1;2024-01-03, 02:50:47Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:71:c3:e8;CMTS-MAC=00:01:5c:7b:86:51;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;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:71:c3:e8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;&nbsp;&nbsp;&nbsp;Frequency start Value&nbsp;&nbsp;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.&nbsp;&nbsp;Starting Frequency&nbsp;&nbsp;&nbsp;&nbsp;&lt;tabindex=-1&gt;Startup Procedure&lt;/tabindex=-1&gt;&nbsp;ProcedureStatusCommentAcquire Downstream Channel507000000 HzLockedConnectivity StateOKOperationalBoot StateOKOperationalSecurityEnableBPI+IP Provisioning ModeHonor MDDIPv6 only&nbsp;&nbsp;&nbsp;&nbsp;&lt;tabindex=-1&gt;Downstream Bonded Channels&lt;/tabindex=-1&gt;&nbsp;&nbsp;ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords1LockedQAM25620507000000 Hz-1.8 dBmV42.6 dB25773775002LockedQAM2564405000000 Hz-2.0 dBmV42.7 dB24672430003LockedQAM2565411000000 Hz-2.1 dBmV42.8 dB24662092004LockedQAM2566417000000 Hz-1.9 dBmV42.9 dB24678030005LockedQAM2567423000000 Hz-2.1 dBmV42.7 dB24682063006LockedQAM2568429000000 Hz-2.0 dBmV42.6 dB24685883007LockedQAM2569435000000 Hz-2.2 dBmV42.7 dB24689633008LockedQAM25610441000000 Hz-2.1 dBmV42.7 dB24693156009LockedQAM25611447000000 Hz-2.0 dBmV42.8 dB246970530010LockedQAM25612453000000 Hz-2.2 dBmV42.7 dB247006830011LockedQAM25613459000000 Hz-2.3 dBmV42.6 dB247041170012LockedQAM25614465000000 Hz-2.4 dBmV42.5 dB247081280013LockedQAM25615471000000 Hz-2.2 dBmV42.6 dB247118150014LockedQAM25616477000000 Hz-1.9 dBmV42.8 dB247155440015LockedQAM25617483000000 Hz-2.0 dBmV42.8 dB247191070016LockedQAM25618489000000 Hz-2.2 dBmV42.5 dB247232150017LockedQAM25619495000000 Hz-1.9 dBmV42.5 dB247268390018LockedQAM25621513000000 Hz-1.9 dBmV42.6 dB247301260019LockedQAM25622519000000 Hz-1.9 dBmV42.7 dB247340390020LockedQAM25623525000000 Hz-1.9 dBmV42.6 dB247378810021LockedQAM25624531000000 Hz-1.7 dBmV42.7 dB247415240022LockedQAM25625537000000 Hz-1.9 dBmV42.6 dB247456300023LockedQAM25626543000000 Hz-2.1 dBmV42.5 dB247491230024LockedQAM25627549000000 Hz-2.3 dBmV42.6 dB247527590025LockedQAM25628555000000 Hz-1.9 dBmV42.6 dB247559440026LockedQAM25629561000000 Hz-1.8 dBmV42.7 dB247603530027LockedQAM25630567000000 Hz-1.9 dBmV42.6 dB247638630028LockedQAM25631573000000 Hz-2.2 dBmV42.5 dB247676390029LockedQAM25632579000000 Hz-2.0 dBmV42.6 dB247711790030LockedQAM25633585000000 Hz-1.9 dBmV42.6 dB247732790031LockedQAM25634591000000 Hz-1.6 dBmV42.8 dB247770670032Not LockedUnknown00 Hz0.0 dBmV0.0 dB000&nbsp;&nbsp;&nbsp;&nbsp;&lt;tabindex=-1&gt;Upstream Bonded Channels&lt;/tabindex=-1&gt;&nbsp;&nbsp;ChannelLock StatusModulationChannel IDFrequencyPower1LockedATDMA110400000 Hz51.8 dBmV2LockedATDMA216400000 Hz51.3 dBmV3LockedATDMA322800000 Hz51.0 dBmV4LockedATDMA429200000 Hz51.3 dBmV5LockedATDMA535600000 Hz51.3 dBmV6LockedATDMA1140400000 Hz52.0 dBmV7Not LockedUnknown00 Hz0.0 dBmV8Not LockedUnknown00 Hz0.0 dBmV&nbsp;&nbsp;&nbsp;&nbsp;&lt;tabindex=-1&gt;Downstream OFDM Channels&lt;/tabindex=-1&gt;&nbsp;&nbsp;ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords1Locked0, 1, 2, 348850000000 Hz-5.8 dBmV39.0 dB1108 ~ 2987248981722457346602Not Locked000 Hz0.0 dBmV0.0 dB0 ~ 4095000&nbsp;&nbsp;&nbsp;&nbsp;&lt;tabindex=-1&gt;Upstream OFDMA Channels&lt;/tabindex=-1&gt;&nbsp;&nbsp;ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower1Not LockedUnknown00 Hz0 dBmV2Not LockedUnknown00 Hz0 dBmV&nbsp;&nbsp;&nbsp;&nbsp;Current System Time:&nbsp;Mon Jan 07 17:37:39 2024&nbsp;&nbsp;System Up Time:&nbsp;0:09:46&nbsp;&nbsp;

nemtulea · Answer

&nbsp;Firmware VersionV10.01.07

nemtulea · Answer

Any advice on this? Appreciated.

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CM1100 Downstream light blinking

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