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Netgear CM1000 Issues

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Netgear CM1000 Issues

For a couple of months now, my Netgear CM1000 just makes my entire network reset over and over again throughout the day. I work from home and this is highly disruptive. I have run the troubleshooting several times and when I check the Status Center, it says there are problems with the modem but it doesn't tell me what. I even tried to do a factory reset. This is my recent log.
Time Priority Description
2018-07-29, 15:03:06 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 .;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;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=b0:39:56:9a:d7:f1;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2018-07-29, 15:01:59 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;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=b0:39:56:9a:d7:f1;CMTS-MAC=00:00:00:00:00:00;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=b0:39:56:9a:d7:f1;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

Please help.
Expert

Re: Netgear CM1000 Issues

Also post the modem's RF signal stats. 

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.




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Frequent Visitor

Re: Netgear CM1000 Issues

Cable Connection

Apply Cancel
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
651000000
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 651000000 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 32 651000000 Hz 5.4 dBmV 41.9 dB 149618115 0 0
2 Locked QAM256 1 453000000 Hz 8.3 dBmV 44.1 dB 148250161 0 0
3 Locked QAM256 2 459000000 Hz 8.6 dBmV 44.3 dB 148259850 0 0
4 Locked QAM256 3 465000000 Hz 8.0 dBmV 43.9 dB 148269714 0 0
5 Locked QAM256 4 471000000 Hz 8.3 dBmV 43.7 dB 148278261 0 0
6 Locked QAM256 5 477000000 Hz 8.7 dBmV 44.0 dB 148288302 0 0
7 Locked QAM256 6 483000000 Hz 7.8 dBmV 43.5 dB 148296537 0 0
8 Locked QAM256 7 489000000 Hz 8.3 dBmV 43.6 dB 148307329 0 0
9 Locked QAM256 8 495000000 Hz 8.8 dBmV 44.0 dB 148316166 0 0
10 Locked QAM256 9 519000000 Hz 7.9 dBmV 40.9 dB 148325765 0 0
11 Locked QAM256 10 525000000 Hz 7.7 dBmV 43.5 dB 148334986 0 0
12 Locked QAM256 11 531000000 Hz 7.3 dBmV 43.0 dB 148344467 0 0
13 Locked QAM256 12 537000000 Hz 7.3 dBmV 43.4 dB 148354198 0 0
14 Locked QAM256 13 543000000 Hz 7.2 dBmV 43.3 dB 148363552 0 0
15 Locked QAM256 14 549000000 Hz 6.3 dBmV 42.7 dB 148372900 0 0
16 Locked QAM256 15 555000000 Hz 6.3 dBmV 42.7 dB 148381885 0 0
17 Locked QAM256 16 561000000 Hz 6.5 dBmV 42.9 dB 148392163 0 0
18 Locked QAM256 17 567000000 Hz 5.6 dBmV 40.8 dB 148402136 0 0
19 Locked QAM256 18 573000000 Hz 6.1 dBmV 42.5 dB 148410725 0 0
20 Locked QAM256 19 579000000 Hz 6.7 dBmV 43.0 dB 148420675 0 0
21 Locked QAM256 20 585000000 Hz 5.7 dBmV 42.1 dB 148429173 0 0
22 Locked QAM256 21 591000000 Hz 6.0 dBmV 42.4 dB 148439178 0 0
23 Locked QAM256 22 597000000 Hz 6.7 dBmV 42.8 dB 148457256 0 0
24 Locked QAM256 23 603000000 Hz 5.9 dBmV 42.3 dB 148466905 0 0
25 Locked QAM256 24 609000000 Hz 5.2 dBmV 42.0 dB 148475555 0 0
26 Locked QAM256 25 615000000 Hz 5.1 dBmV 41.5 dB 148485341 0 0
27 Locked QAM256 26 621000000 Hz 4.6 dBmV 41.8 dB 148490253 0 0
28 Locked QAM256 27 627000000 Hz 4.9 dBmV 41.9 dB 148496833 0 0
29 Locked QAM256 28 633000000 Hz 5.2 dBmV 42.0 dB 148502727 0 0
30 Locked QAM256 30 639000000 Hz 5.3 dBmV 42.0 dB 148484460 0 0
31 Locked QAM256 31 645000000 Hz 5.6 dBmV 42.2 dB 148490578 0 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 36500000 Hz 43.3 dBmV
2 Locked ATDMA 2 30100000 Hz 44.0 dBmV
3 Locked ATDMA 3 23700000 Hz 43.8 dBmV
4 Not Locked Unknown 0 0 Hz 0.0 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 29 690000000 Hz 5.7 dBmV 40.5 dB 1108 ~ 2987 744243 451066 0
2 Not Locked 0 0 0 Hz 2.6 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
Current System Time: Sun Jul 29 15:57:38 2018
Frequent Visitor

Re: Netgear CM1000 Issues

If there is a better way for me to relay that information, let me know.
Thanks!
Expert

Re: Netgear CM1000 Issues

The signal stats are o/k but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) somewhere. 

 

FWIW, there are other signal stat figures that can't be read by the modem. I'm going to try escalating your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic.



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Frequent Visitor

Re: Netgear CM1000 Issues

My log is now showing this:
Time Priority Description
2018-07-30, 01:12:58 Warning (5) Dynamic Range Window violation
2018-07-30, 01:12:58 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
2018-07-30, 01:12:57 Warning (5) Dynamic Range Window violation
2018-07-30, 01:12:57 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
2018-07-30, 01:12:57 Warning (5) Dynamic Range Window violation
2018-07-30, 01:12:57 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
2018-07-30, 01:12:57 Warning (5) Dynamic Range Window violation
2018-07-30, 01:12:57 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
2018-07-29, 23:34:30 Warning (5) Dynamic Range Window violation
2018-07-29, 23:34:30 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
2018-07-29, 15:03:06 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 .;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:39:56:9a:d7:f1;CMTS-MAC=00:01:5c:a6:0c:47;CM-QOS=1.1;CM-VER=3.1;
Frequent Visitor

Re: Netgear CM1000 Issues

Screenshots are easier to read. My fault.
Screenshot_20180730-105934_Chrome.jpg
Frequent Visitor

Re: Netgear CM1000 Issues

1 of 2
Screenshot_20180730-110505_Chrome.jpg
Frequent Visitor

Re: Netgear CM1000 Issues

2 of 2
Screenshot_20180730-110516_Chrome.jpg
Official Employee

Re: Netgear CM1000 Issues

Hi @Nsheeley

 

Thanks for reaching out and sharing the screenshots you provided. I can take a deeper look into this to see if I'm able to locate a cause for your issues. Can you please verify your first and last name, and the phone number or account number associated with your services in a private message? 

 

To send a private message click on my name "ComcastChe", then click send a message. 


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