Skip to main content

    Support

    Offers

U
user_u1aaq0
1st Topic
1st Reply
Conversation Starter

Contributor

 • 

29 Messages

Friday, May 23rd, 2025 1:35 PM

Not seen these errors for a while........

Wed May 21 15:35:56 2025 (Critical (3))  Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
Wed May 21 10:15:48 2025 (Warning (5))  Dynamic Range Window violation
Wed May 21 10:15:48 2025 (Warning (5))  RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=e;CM-QOS=1.1;CM-VER=3.1;

Does anyone know what these mean? Last time a tech was at my apartment, he said that the inside coax was good and that no one would be coming back, since all they can do has been done. Seems there's still something amiss, somewhere. Appreciate some input. Thanks.

Question

 • 

Updated 

13 hours ago

16

7

NoNoBadPuppy

Problem Solver

 • 

572 Messages

2 days ago

Those errors have to do with your upstream power levels and SNR ratios. If they are more than sporadic, you need to have a tech come out and measure signal strength and quality at your home.  It might be a problem with your individual feed, or it could be a problem upstream from your drop.  The tech who visits may or may not be able to rectify the problem.  If he cannot, the tech is responsible for reporting the issue to be escalated so that the upstream issue can be found.

0

0

EG

Expert

 • 

110.5K Messages

1 day ago

Are you actually experiencing any connection problems, or are you just focusing on the error log entries ?

0

0

user_u1aaq0

Contributor

 • 

29 Messages

15 hours ago

I am getting some lag, streaming videos, from various sources, while playing online games and with some websites loading up. This is what the modem shows, currently.

Cable Connection
Cable Diagnostic
Status:   Good
Action:  
Your setup looks fine. If you can't access the internet, make sure you properly activated the modem. If modem has been activated and you still can't access the internet, contact your service provider for troubleshooting help.
If you can access the internet but has other internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
CM Status:
Downstream Status:
Upstream Status:
 
 
Advanced Information
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
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 507000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled 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 5 507000000 Hz 1.0 dBmV 41.8 dB 0 0
2 Locked QAM256 2 489000000 Hz 1.5 dBmV 41.9 dB 0 0
3 Locked QAM256 3 495000000 Hz 1.3 dBmV 41.9 dB 0 0
4 Locked QAM256 4 501000000 Hz 1.1 dBmV 41.8 dB 0 0
5 Locked QAM256 6 513000000 Hz 0.8 dBmV 41.7 dB 0 0
6 Locked QAM256 7 519000000 Hz 0.7 dBmV 41.6 dB 0 0
7 Locked QAM256 8 525000000 Hz 0.5 dBmV 41.5 dB 0 0
8 Locked QAM256 9 531000000 Hz 0.4 dBmV 41.4 dB 0 0
9 Locked QAM256 10 537000000 Hz 0.3 dBmV 41.3 dB 0 0
10 Locked QAM256 11 543000000 Hz 0.1 dBmV 41.3 dB 0 0
11 Locked QAM256 12 549000000 Hz 0.1 dBmV 41.3 dB 0 0
12 Locked QAM256 13 555000000 Hz 0.2 dBmV 41.3 dB 0 0
13 Locked QAM256 14 561000000 Hz 0.1 dBmV 41.3 dB 0 0
14 Locked QAM256 15 567000000 Hz 0.1 dBmV 41.2 dB 0 0
15 Locked QAM256 16 573000000 Hz 0.1 dBmV 41.3 dB 0 0
16 Locked QAM256 17 579000000 Hz -0.1 dBmV 41.1 dB 0 0
17 Locked QAM256 18 585000000 Hz -0.1 dBmV 41.0 dB 0 0
18 Locked QAM256 19 591000000 Hz -0.2 dBmV 41.1 dB 0 0
19 Locked QAM256 20 597000000 Hz -0.1 dBmV 41.2 dB 0 0
20 Locked QAM256 21 603000000 Hz -0.2 dBmV 41.0 dB 0 0
21 Locked QAM256 22 609000000 Hz -0.1 dBmV 41.2 dB 0 0
22 Locked QAM256 23 615000000 Hz -0.1 dBmV 41.2 dB 0 0
23 Locked QAM256 24 621000000 Hz -0.1 dBmV 41.1 dB 0 0
24 Locked QAM256 25 627000000 Hz -0.2 dBmV 41.1 dB 0 0
25 Locked QAM256 26 633000000 Hz 0.0 dBmV 41.2 dB 0 0
26 Locked QAM256 27 639000000 Hz -0.1 dBmV 41.2 dB 0 0
27 Locked QAM256 28 645000000 Hz 0.0 dBmV 41.4 dB 0 0
28 Locked QAM256 29 651000000 Hz -0.2 dBmV 41.2 dB 0 0
29 Locked QAM256 30 657000000 Hz -0.2 dBmV 41.2 dB 0 0
30 Locked QAM256 31 663000000 Hz -0.4 dBmV 41.1 dB 0 0
31 Locked QAM256 32 669000000 Hz -0.5 dBmV 41.1 dB 0 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 9 1280 Ksym/sec 39600000 Hz 40.5 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 40.5 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 40.3 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 39.5 dBmV
5 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 40.0 dBmV
6 Not Locked Unknown 0 0 0 0.0 dBmV
7 Not Locked Unknown 0 0 0 0.0 dBmV
8 Not Locked Unknown 0 0 0 0.0 dBmV
 
Downstream OFDM Channels
Channel Lock Status Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier
Number Range		 Unerrored
Codewords		 Correctable
Codewords		 Uncorrectable
Codewords
1 Locked 0 ,1 ,2 ,3 37 690000000 Hz -0.32 dBmV 40.6 dB 1108 ~ 2987 4422125145 4317284848 12456
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
 
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV

(edited)

https://forums.xfinity.com/conversations/your-home-network/not-seen-these-errors-for-a-while/683079b78b62963bf7057879?commentId=6830bf498b62963bf70af627&replyId=6830c433acfd67012cf45841https://forums.xfinity.com/conversations/your-home-network/not-seen-these-errors-for-a-while/683079b78b62963bf7057879?commentId=6830bf498b62963bf70af627&replyId=6830c433acfd67012cf45841https://forums.xfinity.com/conversations/your-home-network/not-seen-these-errors-for-a-while/683079b78b62963bf7057879?commentId=6830bf498b62963bf70af627&replyId=6830c433acfd67012cf45841

0

0

user_u1aaq0

Contributor

 • 

29 Messages

15 hours ago

@NoNoBadPuppy The last tech that was here, told me nobody would be coming again, since there's nothing they can do. Whether he elevated the problem, is unknown to me. I've thought there was something amiss at the CMTS, for some time, but, as far as I know, nobody bothered to check into it.

0

0

EG

Expert

 • 

110.5K Messages

14 hours ago

@user_u1aaq0 

The signal status values at that snapshot in time were good, but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) /  an upstream channel / return path impairment somewhere.


And there are no uncorrectable bit errors in the bonded downstream QAM's. , but that may not be significant depending on the total uptime of the modem since the last reboot. The small amount in the downstream OFDM channel is normal.


There are other signal stat values 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 (The Digital Care Team) who are available to these boards. They will be able to poll the CMTS (Cable Modem Termination System) to check 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 those upstream receive signal stats.


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

(edited)

0

0

user_u1aaq0

Contributor

 • 

29 Messages

14 hours ago

Thank you. I appreciate it.

1

0

XfinityGabriel

Official Employee

 • 

2.3K Messages

 

user_u1aaq0, Hi there! Thanks for reaching out. I can understand the concern when getting some lag and seeing those errors. We are the right team of experts to help with the internet service concerns. To further assist, please send us a direct message with your first/last name and full address so we can ensure we pull up the right account. You can start by clicking the "direct message" icon on the upper right page of our forum page. Once you click on that, input our shared handle Xfinity Support to send us a direct message. Thank you also @EG for getting this over to us so we can investigate this further. 👍

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Like

Reply

13 hours ago

EG

Expert

 • 

110.5K Messages

14 hours ago

@user_u1aaq0 

Quite welcome ! Please post back with how things go.

0

0

forum icon

New to the Community?

Start Here