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Rousing Reactor

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69 Messages

Wednesday, July 21st, 2021 6:32 PM

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Line errors, uncorrectable errors - Netgear CM600 modem

Good day.  Showing many errors on my Internet only line.  No splitters, one weatherproof barrel connection on side of house in a demarc box, everything tight.  New drop installed from telephone post last year.  Always affects channels 1-16.  Low voltage?  Time for a service call?  Appreciate any replies.  Thank you.

Frequency start Value
Starting Frequency
573000000
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 573000000 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 Correctables Uncorrectables
1 Locked QAM256 17 573000000 Hz 5.9 dBmV 38.8 dB 588 836
2 Locked QAM256 42 447000000 Hz 5.3 dBmV 38.4 dB 1046 1589
3 Locked QAM256 43 453000000 Hz 5.6 dBmV 38.5 dB 1043 1242
4 Locked QAM256 44 459000000 Hz 5.2 dBmV 38.2 dB 923 1536
5 Locked QAM256 45 465000000 Hz 5.5 dBmV 38.5 dB 973 1357
6 Locked QAM256 1 471000000 Hz 5.4 dBmV 38.6 dB 886 1135
7 Locked QAM256 2 477000000 Hz 5.4 dBmV 38.8 dB 878 1314
8 Locked QAM256 3 483000000 Hz 5.6 dBmV 38.9 dB 941 1142
9 Locked QAM256 4 489000000 Hz 5.4 dBmV 38.5 dB 782 1179
10 Locked QAM256 5 495000000 Hz 5.6 dBmV 38.5 dB 897 1254
11 Locked QAM256 6 507000000 Hz 5.8 dBmV 36.1 dB 761 991
12 Locked QAM256 7 513000000 Hz 5.8 dBmV 38.5 dB 697 1091
13 Locked QAM256 8 519000000 Hz 5.9 dBmV 38.6 dB 836 1149
14 Locked QAM256 9 525000000 Hz 6.0 dBmV 38.5 dB 792 1079
15 Locked QAM256 10 531000000 Hz 6.0 dBmV 38.5 dB 705 1167
16 Locked QAM256 11 537000000 Hz 6.2 dBmV 38.6 dB 761 1086
17 Locked QAM256 12 543000000 Hz 5.8 dBmV 40.3 dB 0 0
18 Locked QAM256 13 549000000 Hz 6.3 dBmV 40.3 dB 0 0
19 Locked QAM256 14 555000000 Hz 6.1 dBmV 40.3 dB 0 0
20 Locked QAM256 15 561000000 Hz 6.2 dBmV 40.3 dB 0 0
21 Locked QAM256 16 567000000 Hz 6.3 dBmV 39.9 dB 0 0
22 Locked QAM256 18 579000000 Hz 6.3 dBmV 40.3 dB 0 0
23 Locked QAM256 19 585000000 Hz 6.0 dBmV 40.1 dB 0 0
24 Locked QAM256 20 591000000 Hz 6.5 dBmV 39.9 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 48.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 48.5 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 47.8 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 47.8 dBmV
5 Locked ATDMA 5 2560 Ksym/sec 40400000 Hz 47.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Current System Time: Wed Jul 21 11:53:08 2021
System Up Time: 114:30:01

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5 years ago

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69 Messages

5 years ago

Things are all better.  I had a tech scheduled for today, but I believe someone got into my line, fixed things, and rebooted the modem on Sunday.  Tech was  cancelled.

Frequency start Value
Starting Frequency
573000000
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 573000000 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 Correctables Uncorrectables
1 Locked QAM256 17 573000000 Hz 6.6 dBmV 39.1 dB 0 0
2 Locked QAM256 18 579000000 Hz 6.7 dBmV 39.1 dB 0 0
3 Locked QAM256 19 585000000 Hz 5.9 dBmV 38.9 dB 0 0
4 Locked QAM256 20 591000000 Hz 5.7 dBmV 38.8 dB 0 0
5 Locked QAM256 21 597000000 Hz 5.2 dBmV 38.6 dB 0 0
6 Locked QAM256 22 603000000 Hz 4.9 dBmV 38.6 dB 0 0
7 Locked QAM256 23 609000000 Hz 5.6 dBmV 38.8 dB 0 0
8 Locked QAM256 24 615000000 Hz 6.0 dBmV 38.9 dB 0 0
9 Locked QAM256 25 621000000 Hz 7.1 dBmV 39.2 dB 0 0
10 Locked QAM256 26 627000000 Hz 7.5 dBmV 39.2 dB 0 0
11 Locked QAM256 27 633000000 Hz 7.5 dBmV 39.1 dB 0 0
12 Locked QAM256 28 639000000 Hz 7.2 dBmV 38.9 dB 0 0
13 Locked QAM256 29 645000000 Hz 7.1 dBmV 39.0 dB 0 0
14 Locked QAM256 30 651000000 Hz 6.4 dBmV 38.8 dB 0 0
15 Locked QAM256 31 657000000 Hz 5.7 dBmV 38.5 dB 0 0
16 Locked QAM256 32 663000000 Hz 5.3 dBmV 38.4 dB 0 0
17 Locked QAM256 33 669000000 Hz 4.7 dBmV 39.0 dB 0 0
18 Locked QAM256 34 675000000 Hz 5.3 dBmV 39.0 dB 0 0
19 Locked QAM256 35 681000000 Hz 6.1 dBmV 39.3 dB 0 0
20 Locked QAM256 36 687000000 Hz 6.5 dBmV 39.4 dB 0 0
21 Locked QAM256 37 693000000 Hz 7.0 dBmV 39.4 dB 0 0
22 Locked QAM256 38 699000000 Hz 7.0 dBmV 39.5 dB 0 0
23 Locked QAM256 39 705000000 Hz 7.0 dBmV 39.4 dB 0 0
24 Locked QAM256 40 711000000 Hz 6.8 dBmV 39.4 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 47.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 47.3 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 46.5 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 46.5 dBmV
5 Locked ATDMA 5 2560 Ksym/sec 40400000 Hz 46.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Current System Time: Wed Jul 28 04:40:12 2021
System Up Time: 63:16:40

  

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EG

Expert

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118.3K Messages

5 years ago

The downstream power is not "low". It's actually on the high side / in spec.

Are you actually experiencing any connectivity / performance problems, or just focusing on the errors ?

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69 Messages

5 years ago

Yes, buffering during streaming with several providers which normally consume only about 6 Mbps.  My line is 50/5.  Line ran clean for about a year.

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EG

Expert

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118.3K Messages

5 years ago

O/k are there any modem error log entries being shown ? If so, please post them as well in their entirety.

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69 Messages

5 years ago

Time Priority Description
2021-07-19, 18:44:46 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;
2021-07-07, 14:33:23 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;
2021-06-27, 19:05:37 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;
2021-06-15, 14:25:53 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;
2021-06-02, 01:31:24 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;
2021-04-07, 06:12:48 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;
2021-04-05, 23:29:35 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:29:05 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:49 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:40 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:29 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:28 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:21 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:21 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:16 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:15 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:14 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:12 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:09 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:28:08 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:58 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:57 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:52 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:50 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:47 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:47 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:44 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:43 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-04-05, 23:27:40 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;

(edited)

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CCAmir

Gold Problem Solver

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7.2K Messages

Hello Peder, thank you for taking the time out of your busy day to get this concern addressed. You've come to the perfect place to get your speeds and connectivity up to par, our digital care team specializes in all things Xfinity and we're happy to help with getting one of our awesome technicians out if needed. To better assist you could you please send me a private message with your full name and street address? 

I no longer work for Comcast.

5 years ago

0

EG

Expert

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118.3K Messages

@ComcastAmir @prove  

Here's how to send that private message;

To send a "Peer to peer" / "Private chat message" message to Xfinity Support:
 • Click "Sign In" if necessary
 • Click the "Peer to peer chat" icon or https://comca.st/3yNGegR 
 • Click the "New message" (pencil and paper) icon
 • The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there
 •  - As you are typing a drop-down list appears. Select "Xfinity Support" from that list
 •  - An "Xfinity Support" graphic replaces the "To:" line
 • Type your message in the text area near the bottom of the window
 • Press Enter to send it


See https://comca.st/3i4B6z4  for an example.    

(Credit to @BruceW for this excellent explanation.) 

(edited)

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? Please mark an Accepted Answer!tick

5 years ago

0

EG

Expert

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118.3K Messages

5 years ago

O/k, even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) / an upstream channel-return path impairment somewhere.


There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees that are available to these boards.  They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !

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EG

Expert

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118.3K Messages

5 years ago

Thanks for circling back ! Hope things hold up for you ! Good luck ! Now closing your topic.

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