Started Unicast Maintenance Ranging - No Response received - T3 time-out

Hi,

Pretty regularly I have connection issues and experiencing connection drops and slow speeds.

Last week I switched from my Arris SB8200 I used for years where the front LEDs often times went from blue to green only (with the intervals after I rebooted the modem of initially a few days to then only two hours or so) to a brand new Netgear CM3000, but are still experiencing issues. I attached some log excerpts from my Netgear modem below.

How to get that fixed?

Is the Xfinity connection to my house bad?

Please help.

Time	Priority	Description
Sat Mar 22 07:39:28 2025	(Warning (5))	MDD message timeout;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:39:25 2025	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:29:45 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 10 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:27:15 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 11 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:22:41 2025	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:22:15 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 10 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:17:15 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 11 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:14:13 2025	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:08:15 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 10 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:07:45 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:07:15 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 12 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 07:01:56 2025	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 06:58:00 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 10 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 06:57:30 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 12 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 06:53:15 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 10 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 06:52:30 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 11 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;
Sat Mar 22 06:48:00 2025	(Notice (6))	US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 10 13.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;

Responses

U

user_9kl5h4

9 Messages

12 days ago

Here are some stats from the modem:

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	405000000 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	4	405000000 Hz	1.1 dBmV	43.7 dB	42	0
2	Locked	QAM256	1	387000000 Hz	1.8 dBmV	43.9 dB	5	0
3	Locked	QAM256	2	393000000 Hz	1.3 dBmV	43.7 dB	5	0
4	Locked	QAM256	3	399000000 Hz	1.0 dBmV	43.6 dB	7	0
5	Locked	QAM256	5	411000000 Hz	0.9 dBmV	43.4 dB	6	0
6	Locked	QAM256	6	417000000 Hz	1.5 dBmV	43.9 dB	10	0
7	Locked	QAM256	7	423000000 Hz	1.1 dBmV	43.8 dB	3	0
8	Locked	QAM256	8	429000000 Hz	0.9 dBmV	43.8 dB	5	0
9	Locked	QAM256	9	435000000 Hz	0.9 dBmV	43.7 dB	17	0
10	Locked	QAM256	10	441000000 Hz	0.3 dBmV	43.5 dB	17	0
11	Locked	QAM256	11	447000000 Hz	1.0 dBmV	43.7 dB	4	0
12	Locked	QAM256	12	453000000 Hz	1.2 dBmV	43.8 dB	19	0
13	Locked	QAM256	13	459000000 Hz	1.1 dBmV	43.8 dB	4	0
14	Locked	QAM256	14	465000000 Hz	1.0 dBmV	43.7 dB	5	0
15	Locked	QAM256	15	471000000 Hz	0.3 dBmV	43.4 dB	2	0
16	Locked	QAM256	16	477000000 Hz	0.3 dBmV	43.4 dB	1	0
17	Locked	QAM256	17	483000000 Hz	0.8 dBmV	43.7 dB	1	0
18	Locked	QAM256	18	489000000 Hz	1.0 dBmV	43.7 dB	6	0
19	Locked	QAM256	19	495000000 Hz	1.1 dBmV	43.8 dB	4	0
20	Locked	QAM256	20	501000000 Hz	0.1 dBmV	43.3 dB	7	0
21	Locked	QAM256	21	507000000 Hz	-0.5 dBmV	43.1 dB	6	0
22	Locked	QAM256	22	513000000 Hz	-0.2 dBmV	43.3 dB	3	0
23	Locked	QAM256	23	519000000 Hz	0.1 dBmV	43.4 dB	2	0
24	Locked	QAM256	24	525000000 Hz	0.8 dBmV	43.7 dB	1	0
25	Locked	QAM256	25	531000000 Hz	0.1 dBmV	43.3 dB	2	0
26	Locked	QAM256	26	537000000 Hz	-1.2 dBmV	42.7 dB	1	0
27	Locked	QAM256	27	543000000 Hz	-1.2 dBmV	42.6 dB	1	0
28	Locked	QAM256	28	549000000 Hz	-1.3 dBmV	42.5 dB	0	0
29	Locked	QAM256	29	555000000 Hz	0.0 dBmV	43.1 dB	2	0
30	Locked	QAM256	30	561000000 Hz	0.4 dBmV	43.4 dB	3	0
31	Locked	QAM256	31	567000000 Hz	-0.7 dBmV	42.8 dB	1	0
32	Locked	QAM256	32	573000000 Hz	-1.4 dBmV	42.4 dB	3	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	2	5120 Ksym/sec	22800000 Hz	43.3 dBmV
2	Locked	ATDMA	1	5120 Ksym/sec	16400000 Hz	41.0 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29200000 Hz	41.5 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	44.3 dBmV
5	Not Locked	Unknown	0	0	0	0.0 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	193	722000000 Hz	-0.82 dBmV	42.0 dB	448 ~ 3647	3358042890	2966129486	3564
2	Locked	0 ,1 ,2 ,3	194	957000000 Hz	-1.32 dBmV	41.1 dB	148 ~ 3947	3408640129	2835873033	0

Upstream OFDMA Channels

Channel	Lock Status	Modulation / Profile ID	Channel ID	Frequency	Power
1	Locked	11 ,13	41	36200000 Hz	40.3 dBmV
2	Not Locked	0	0	0 Hz	0 dBmV

2

0

XfinityAldrik

Official Employee

•

2.1K Messages

Thank you for reaching out to us @user_9kl5h4! We appreciate you for confirming you are experiencing intermittent and slow connection issues. EG shared some really helpful information for this too! I would like to send a signal on my end to take a deeper look at the signals EG mentioned, this however, will require confirming some personal information to locate your account and take a deeper look over direct message.

Could you please send our team a direct message with your full name and full address? To send a "Direct Message" to Xfinity Support:

Click "Sign In" if necessary

Click the "Direct Messaging" icon or https://forums.xfinity.com/direct-messaging

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.

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

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12 days ago

U

user_9kl5h4

9 Messages

Hi @XfinityAldrik thank you for taking a look at my issue. I have just sent your team a direct message with my name and address.

What is next?

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12 days ago

0

EG

Expert

•

109.5K Messages

12 days ago

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 intermittent noise ingress into the line(s) / an upstream channel / return path impairment somewhere.

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 !

1

U

user_9kl5h4

9 Messages

Thanks a lot, @EG ! I already provide the Xfinity support with details as requested.

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12 days ago

0

EG

Expert

•

109.5K Messages

12 days ago

@user_9kl5h4

Quite welcome ! FWIW. I posted before the employee posted. I escalated your concern to the team and then the employee responded afterward. The forum does not display posts in a linear order.

(edited)

0

U

user_9kl5h4

9 Messages

2 days ago

Hi,

What is needed to get fast internet back again (as I had with my previous SB8200 modem)?

Thanks for helping me!

Note: This comment was created from a merged conversation originally titled After modem change: Arris SB8200 shows only green for upstream/downstream and no blue LED for fast Internet?

7

0

EG

Expert

•

109.5K Messages

When you do a speed test, are you getting your subscribed to speeds ?

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.

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2 days ago

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XfinityAldrik

Official Employee

•

2.1K Messages

Merged new post to previous post

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

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2 days ago

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XfinityAldrik

Official Employee

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2.1K Messages

Thanks again for reaching out to us @user_9kl5h4! I merged your newest post with this previous one, so we can continue working in the direct message thread currently opened for this issue. This will also help us post a solution in this thread once we resolve things over direct message.

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.
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2 days ago

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U

user_9kl5h4

9 Messages

@XfinityAldrik That previous message was for a different problem, with a different modem. That older thread could be considered as solved.

Now I have an issue with my SB8200 v3 - which is why I opened a new thread.

How to move on with that new issue.

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2 days ago

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XfinityAldrik

Official Employee

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2.1K Messages

It is true, that we do prefer to have different threads for different issues @user_9kl5h4. This is slightly different from the original topic, however, we were already working over DM for the new topic before the new question was posted. We typically advise customers to avoid sending unsolicited direct messages unless invited to send a direct message by an official employee, this applies to new topics too. Although, since both posts were internet related and involved switching the modem, they were close enough to merge, so we could proceed with troubleshooting via DM.

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

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2 days ago

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Your Home Network

user_9kl5h4

Started Unicast Maintenance Ranging - No Response received - T3 time-out

user_9kl5h4

XfinityAldrik

user_9kl5h4

EG

user_9kl5h4

EG

user_9kl5h4

EG

XfinityAldrik

XfinityAldrik

user_9kl5h4

XfinityAldrik

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