Time Not Established Critical (3) No Ranging Response received - T3 time-out

I've been getting this error and internet drops for at leat a Month now. We have been working from home and need consistant, stable internet connectivity. I am a network engineer so it is vital that my connection to the internet does not drop. My modem is a Netgear CM700 and my router is a TP-Link. So the modem randomly times out after the 16 response/tries and therefore looses it's public ip. I've removed all splitters coming from outside into my home. So I need a tech to come out to test the coax coming from the headend. How do I make that happen without having an exhausting conversation with Comcast? Here are the logs from the Modem today. By the way, the logs are a hour begind and I'm not sure if this is a NTP issues or what? I assume the NTP server would be from Comcast that is given to the Modem?

Time	Priority	Description
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Sep 07 2020 17:23:59	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 04:07:12	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Sep 08 2020 04:41:12	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 09:48:21	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 09:54:10	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1

Responses

EG

Expert

•

110.2K Messages

5 years ago

Modems don't do daylight savings time so the timestamp is normal.

That said, What do the modem's signal stats look like ? Try getting them here; http://192.168.100.1

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

johnw75

Regular Visitor

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4 Messages

5 years ago

These are the most db and SNR levels on the upstream and downstream respectivley. The db's are averiging /hovering around 1 dBmV within spec, which is kind of low, but the SNR are lower than recommended. Also, the Upstream Bonded is averiging around 47.0 dBmV. I believe the "best level" should be around 49 dBmV.

Starting Frequency

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	477000000 Hz	Locked
Connectivity State	Ok	Operational
Boot State	Ok	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	UnCorrectables
1	Locked	QAM 256	1	477000000 Hz	0.7 dBmV	37.6 dB	0	0
2	Locked	QAM 256	2	483000000 Hz	0.7 dBmV	37.6 dB	0	0
3	Locked	QAM 256	3	489000000 Hz	1.0 dBmV	38.6 dB	5	0
4	Locked	QAM 256	4	495000000 Hz	1.0 dBmV	37.6 dB	0	0
5	Locked	QAM 256	5	501000000 Hz	1.0 dBmV	38.6 dB	8	0
6	Locked	QAM 256	6	507000000 Hz	1.4 dBmV	38.6 dB	5	0
7	Locked	QAM 256	7	513000000 Hz	1.0 dBmV	37.6 dB	8	0
8	Locked	QAM 256	8	519000000 Hz	1.0 dBmV	37.6 dB	5	0
9	Locked	QAM 256	9	525000000 Hz	1.0 dBmV	37.6 dB	0	0
10	Locked	QAM 256	10	531000000 Hz	0.7 dBmV	37.6 dB	0	0
11	Locked	QAM 256	11	537000000 Hz	0.5 dBmV	37.3 dB	7	0
12	Locked	QAM 256	12	543000000 Hz	0.5 dBmV	37.3 dB	0	0
13	Locked	QAM 256	13	555000000 Hz	0.2 dBmV	37.3 dB	7	0
14	Locked	QAM 256	14	561000000 Hz	0.2 dBmV	37.3 dB	14	0
15	Locked	QAM 256	15	567000000 Hz	0.2 dBmV	37.6 dB	18	0
16	Locked	QAM 256	16	573000000 Hz	0.0 dBmV	37.6 dB	8	0
17	Locked	QAM 256	17	579000000 Hz	0.0 dBmV	37.3 dB	3	0
18	Locked	QAM 256	18	585000000 Hz	-0.2 dBmV	37.3 dB	0	0
19	Locked	QAM 256	19	591000000 Hz	-0.7 dBmV	37.3 dB	9	0
20	Locked	QAM 256	20	597000000 Hz	-1.2 dBmV	37.3 dB	18	0
21	Locked	QAM 256	21	603000000 Hz	-1.9 dBmV	36.6 dB	14	0
22	Locked	QAM 256	22	609000000 Hz	-1.7 dBmV	36.3 dB	16	0
23	Locked	QAM 256	23	615000000 Hz	-1.5 dBmV	36.6 dB	17	0
24	Locked	QAM 256	24	621000000 Hz	-0.7 dBmV	36.6 dB	0	0
25	Locked	QAM 256	25	627000000 Hz	0.0 dBmV	36.9 dB	3	0
26	Locked	QAM 256	26	633000000 Hz	0.4 dBmV	36.9 dB	6	0
27	Locked	QAM 256	27	639000000 Hz	1.0 dBmV	37.3 dB	0	0
28	Locked	QAM 256	28	645000000 Hz	1.0 dBmV	37.3 dB	0	0
29	Locked	QAM 256	29	651000000 Hz	1.5 dBmV	37.3 dB	0	0
30	Locked	QAM 256	30	657000000 Hz	1.5 dBmV	37.3 dB	0	0
31	Locked	QAM 256	31	663000000 Hz	1.5 dBmV	37.3 dB	3	0
32	Locked	QAM 256	32	669000000 Hz	1.7 dBmV	37.3 dB	10	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	7	5120 Ksym/sec	16400000 Hz	47.5 dBmV
2	Locked	ATDMA	6	5120 Ksym/sec	22800000 Hz	47.8 dBmV
3	Locked	ATDMA	5	5120 Ksym/sec	29200000 Hz	47.3 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	46.8 dBmV
5	Locked	ATDMA	10	1280 Ksym/sec	39600000 Hz	47.3 dBmV
6	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV

EG

Expert

•

110.2K Messages

5 years ago

The stats are fine. There are no uncorrectable bit errors.

Are there any error / event log entries being shown ? If so, please post them as well.

johnw75

Regular Visitor

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4 Messages

5 years ago

No. Just more of the same... My wife is on a Teams call right now with her Boss and the internet keps dropping. I need to get this fix or I need to find a new ISP. Please note how many "Critical (3) T3 time-out" drops! " ie internet dropps since 4 am! Do you know how to get a Tech to come out or do I need to call them directly?

Time	Priority	Description
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Sep 07 2020 17:23:59	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 04:07:12	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Sep 08 2020 04:41:12	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 09:48:21	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 09:54:10	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Sep 08 2020 11:52:11	Critical (3)	No Ranging Response received - T3 time-out
Sep 08 2020 14:28:05	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1

EG

Expert

•

110.2K Messages

5 years ago

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) 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 !

CCTambrey

Gold Problem Solver

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3.4K Messages

5 years ago

Hello, johnw75! Welcome to the Xfinity Forums.

Thanks for working with our Expert EG here to get a better idea of your situation with intermittent connectivity. I would love to take a closer look and see if we can pinpoint a cause or get one of our wonderful field techs out to make repairs. Please send me a private message with your first and last name, as well as your service address so I can assist.

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

user_b16742

Visitor

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4 Messages

4 years ago

I am having this same issue with the: