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Re: Please take a look at CM-1000 modem signals & error log and advise. Thanks

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Re: Please take a look at CM-1000 modem signals & error log and advise. Thanks

Would you mind looking at mine and seeing if there is any problems? I've been having constant disconnects every few hours for the first time ever for about a week straight so far(been with Comcast for 2 years) and I'm not sure if the connection is throttling because of a wave of new customers because of their new 60 Day Free Unlimited Data Cable Internet deal or what. Talked to a representative twice and haven't figured it out because they say the connection seems healthy from their side. I have a tech scheduled but I don't want to pay if there's no problem and them blaming it on the modem and I'm also scared of contracting Coronavirus.

 

Here are my modem details on the Netgear CM1000. Thanks

 

<tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment
Acquire Downstream Channel 555000000 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 20 555000000 Hz 8.1 dBmV 40.2 dB 62881475 1 0
2 Locked QAM256 17 537000000 Hz 8.2 dBmV 40.1 dB 61810662 0 0
3 Locked QAM256 18 543000000 Hz 8.0 dBmV 39.9 dB 61814277 0 0
4 Locked QAM256 19 549000000 Hz 7.9 dBmV 40.2 dB 61817975 0 0
5 Locked QAM256 21 561000000 Hz 8.5 dBmV 40.1 dB 61821547 0 0
6 Locked QAM256 22 567000000 Hz 8.6 dBmV 40.1 dB 61825685 0 0
7 Locked QAM256 23 573000000 Hz 8.5 dBmV 39.9 dB 61828894 0 0
8 Locked QAM256 24 579000000 Hz 8.5 dBmV 39.9 dB 61832614 0 0
9 Locked QAM256 25 585000000 Hz 8.6 dBmV 39.8 dB 61836582 0 0
10 Locked QAM256 26 591000000 Hz 8.8 dBmV 39.8 dB 61840052 1 0
11 Locked QAM256 27 597000000 Hz 8.6 dBmV 39.7 dB 61843538 0 0
12 Locked QAM256 28 603000000 Hz 8.3 dBmV 39.8 dB 61847548 0 0
13 Locked QAM256 29 609000000 Hz 7.8 dBmV 39.5 dB 61851281 1 0
14 Locked QAM256 30 615000000 Hz 7.9 dBmV 39.5 dB 61855048 0 0
15 Locked QAM256 31 621000000 Hz 8.2 dBmV 39.5 dB 61858951 0 0
16 Locked QAM256 32 627000000 Hz 8.2 dBmV 39.6 dB 61862338 0 0
17 Locked QAM256 33 633000000 Hz 8.0 dBmV 39.7 dB 61866274 0 0
18 Locked QAM256 34 639000000 Hz 7.8 dBmV 39.6 dB 61870171 0 0
19 Locked QAM256 35 645000000 Hz 8.3 dBmV 39.6 dB 61873696 0 0
20 Locked QAM256 36 651000000 Hz 8.2 dBmV 39.2 dB 61877401 0 0
21 Locked QAM256 37 657000000 Hz 8.2 dBmV 39.4 dB 61880850 0 0
22 Locked QAM256 38 663000000 Hz 7.9 dBmV 39.4 dB 61884705 0 0
23 Locked QAM256 39 669000000 Hz 8.2 dBmV 39.4 dB 61888459 0 0
24 Locked QAM256 40 675000000 Hz 8.5 dBmV 39.3 dB 61892551 0 0
25 Locked QAM256 41 681000000 Hz 9.0 dBmV 39.4 dB 61895669 0 0
26 Locked QAM256 42 687000000 Hz 9.2 dBmV 39.5 dB 61899653 0 0
27 Locked QAM256 43 693000000 Hz 8.8 dBmV 39.3 dB 61903726 0 0
28 Locked QAM256 44 699000000 Hz 8.9 dBmV 39.3 dB 61906954 0 0
29 Locked QAM256 45 705000000 Hz 9.3 dBmV 39.5 dB 61909118 0 0
30 Locked QAM256 46 711000000 Hz 9.6 dBmV 39.1 dB 61910505 0 0
31 Locked QAM256 47 717000000 Hz 9.3 dBmV 39.5 dB 61911278 0 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 33 36500000 Hz 47.8 dBmV
2 Locked ATDMA 34 30100000 Hz 48.3 dBmV
3 Locked ATDMA 35 23700000 Hz 46.8 dBmV
4 Locked ATDMA 36 17300000 Hz 45.8 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 48 805000000 Hz 5.6 dBmV 36.3 dB 1168 ~ 2927 13036814 12620834 0
2 Not Locked 0 0 0 Hz 5.9 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
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Re: Please take a look at CM-1000 modem signals & error log and advise. Thanks

Here are my event logs @EG 

2020-03-22, 11:43:53 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2020-03-21, 11:50:27 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2020-03-21, 11:21:24 Critical (3) Resetting the cable modem due to docsDevResetNow
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;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=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;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=cc:40:d0:25:65:30;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2020-03-03, 01:24:11 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=cc:40:d0:25:65:30;CMTS-MAC=00:01:5c:63:aa:4a;CM-QOS=1.1;CM-VER=3.1;
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Expert

Re: Please take a look at CM-1000 modem signals & error log and advise. Thanks

The upstream power is a bit on the high side (especially on channel number 2) 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, and latency problems.

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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Re: Please take a look at CM-1000 modem signals & error log and advise. Thanks

Thank you.


Am I able to call and tell them to put less power into Upstream channel 2? Or does a technician have to come and do that

 

And do you have any recommendations on a Coax Cable brand?

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Expert

Re: Please take a look at CM-1000 modem signals & error log and advise. Thanks


@CircaRhythm wrote:

Thank you.


Am I able to call and tell them to put less power into Upstream channel 2? Or does a technician have to come and do that


No. It doesn't work like that. It takes a *boots on the ground* physical intervention.



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!