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Forum Discussion

nemtulea's avatar
nemtulea
Aspirant
Jan 07, 2024

CM1100 Downstream light blinking

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 "Downs...
Troubleshooting
FURRYe38's avatar
FURRYe38
Guru - Experienced User
Jan 08, 2024

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-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router

 

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. 

nemtulea's avatar
nemtulea
Aspirant
Jan 08, 2024
 
 
TimePriorityDescription
2024-01-08, 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 = IPv6
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;
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;
   
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> 
ProcedureStatusComment
Acquire Downstream Channel507000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only
  
  
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>  
ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25620507000000 Hz-1.8 dBmV42.6 dB2577377500
2LockedQAM2564405000000 Hz-2.0 dBmV42.7 dB2467243000
3LockedQAM2565411000000 Hz-2.1 dBmV42.8 dB2466209200
4LockedQAM2566417000000 Hz-1.9 dBmV42.9 dB2467803000
5LockedQAM2567423000000 Hz-2.1 dBmV42.7 dB2468206300
6LockedQAM2568429000000 Hz-2.0 dBmV42.6 dB2468588300
7LockedQAM2569435000000 Hz-2.2 dBmV42.7 dB2468963300
8LockedQAM25610441000000 Hz-2.1 dBmV42.7 dB2469315600
9LockedQAM25611447000000 Hz-2.0 dBmV42.8 dB2469705300
10LockedQAM25612453000000 Hz-2.2 dBmV42.7 dB2470068300
11LockedQAM25613459000000 Hz-2.3 dBmV42.6 dB2470411700
12LockedQAM25614465000000 Hz-2.4 dBmV42.5 dB2470812800
13LockedQAM25615471000000 Hz-2.2 dBmV42.6 dB2471181500
14LockedQAM25616477000000 Hz-1.9 dBmV42.8 dB2471554400
15LockedQAM25617483000000 Hz-2.0 dBmV42.8 dB2471910700
16LockedQAM25618489000000 Hz-2.2 dBmV42.5 dB2472321500
17LockedQAM25619495000000 Hz-1.9 dBmV42.5 dB2472683900
18LockedQAM25621513000000 Hz-1.9 dBmV42.6 dB2473012600
19LockedQAM25622519000000 Hz-1.9 dBmV42.7 dB2473403900
20LockedQAM25623525000000 Hz-1.9 dBmV42.6 dB2473788100
21LockedQAM25624531000000 Hz-1.7 dBmV42.7 dB2474152400
22LockedQAM25625537000000 Hz-1.9 dBmV42.6 dB2474563000
23LockedQAM25626543000000 Hz-2.1 dBmV42.5 dB2474912300
24LockedQAM25627549000000 Hz-2.3 dBmV42.6 dB2475275900
25LockedQAM25628555000000 Hz-1.9 dBmV42.6 dB2475594400
26LockedQAM25629561000000 Hz-1.8 dBmV42.7 dB2476035300
27LockedQAM25630567000000 Hz-1.9 dBmV42.6 dB2476386300
28LockedQAM25631573000000 Hz-2.2 dBmV42.5 dB2476763900
29LockedQAM25632579000000 Hz-2.0 dBmV42.6 dB2477117900
30LockedQAM25633585000000 Hz-1.9 dBmV42.6 dB2477327900
31LockedQAM25634591000000 Hz-1.6 dBmV42.8 dB2477706700
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000
  
  
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>  
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA110400000 Hz51.8 dBmV
2LockedATDMA216400000 Hz51.3 dBmV
3LockedATDMA322800000 Hz51.0 dBmV
4LockedATDMA429200000 Hz51.3 dBmV
5LockedATDMA535600000 Hz51.3 dBmV
6LockedATDMA1140400000 Hz52.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV
  
  
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>  
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 348850000000 Hz-5.8 dBmV39.0 dB1108 ~ 298724898172245734660
2Not Locked000 Hz0.0 dBmV0.0 dB0 ~ 4095000
  
  
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>  
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV
  
  
Current System Time: Mon Jan 07 17:37:39 2024  
System Up Time: 0:09:46