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rzedaker
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Wednesday, July 30th, 2025

No Ranging Response received - T3 time-out

I recently upgraded my cable modem to an Arris S34 and have had many issues.  Comcast Technician removed an old device from my house (signal enhancer) yesterday that appears to have helped however I still have network disconnects and the S34 Log show's this issue every 2 hours or so.  

No Ranging Response received - T3 time-out

Help would be appreciated

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21 hours ago

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EG

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112.3K Messages

7 days ago

What do the modem's signal status values look like ? Try getting them here; http://192.168.100.1  

Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.

Please post the error log entries as well in their entirety (copy and paste them, don't post a screenshot) but redact any CM MAC and the CMTS MAC addresses for privacy. They are considered to be personal information. The posting of personally identifying information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publicly.

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rzedaker

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Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
20 Locked 256QAM 495000000 Hz 12.1 dBmV 43.4 dB 0 0
28 Locked 256QAM 543000000 Hz 12.1 dBmV 43.4 dB 0 0
36 Locked 256QAM 591000000 Hz 11.8 dBmV 43.4 dB 0 0
44 Locked 256QAM 639000000 Hz 11.4 dBmV 40.9 dB 0 0
13 Locked 256QAM 453000000 Hz 11.5 dBmV 40.9 dB 0 0
14 Locked 256QAM 459000000 Hz 11.5 dBmV 43.4 dB 0 0
15 Locked 256QAM 465000000 Hz 11.7 dBmV 43.4 dB 0 0
16 Locked 256QAM 471000000 Hz 11.8 dBmV 43.4 dB 0 0
17 Locked 256QAM 477000000 Hz 11.8 dBmV 43.4 dB 0 0
18 Locked 256QAM 483000000 Hz 11.9 dBmV 40.9 dB 0 0
19 Locked 256QAM 489000000 Hz 11.9 dBmV 40.9 dB 0 0
21 Locked 256QAM 501000000 Hz 12.1 dBmV 43.4 dB 0 0
22 Locked 256QAM 507000000 Hz 12.1 dBmV 43.4 dB 0 0
23 Locked 256QAM 513000000 Hz 12.3 dBmV 40.9 dB 0 0
24 Locked 256QAM 519000000 Hz 12.2 dBmV 40.9 dB 0 0
25 Locked 256QAM 525000000 Hz 12.2 dBmV 43.4 dB 0 0
26 Locked 256QAM 531000000 Hz 12.2 dBmV 43.4 dB 0 0
27 Locked 256QAM 537000000 Hz 12.2 dBmV 43.4 dB 0 0
29 Locked 256QAM 549000000 Hz 12.2 dBmV 43.4 dB 0 0
30 Locked 256QAM 555000000 Hz 12.1 dBmV 43.4 dB 0 0
31 Locked 256QAM 561000000 Hz 12.0 dBmV 43.4 dB 0 0
32 Locked 256QAM 567000000 Hz 12.0 dBmV 43.4 dB 0 0
33 Locked 256QAM 573000000 Hz 11.8 dBmV 43.4 dB 0 0
34 Locked 256QAM 579000000 Hz 12.0 dBmV 43.4 dB 0 0
35 Locked 256QAM 585000000 Hz 11.7 dBmV 40.9 dB 0 0
37 Locked 256QAM 597000000 Hz 11.6 dBmV 43.4 dB 0 0
38 Locked 256QAM 603000000 Hz 12.4 dBmV 40.9 dB 0 0
39 Locked 256QAM 609000000 Hz 12.0 dBmV 40.9 dB 0 0
40 Locked 256QAM 615000000 Hz 12.0 dBmV 43.4 dB 0 0
41 Locked 256QAM 621000000 Hz 11.7 dBmV 43.4 dB 0 0
42 Locked 256QAM 627000000 Hz 11.8 dBmV 40.9 dB 0 0
43 Locked 256QAM 633000000 Hz 11.4 dBmV 40.9 dB 0 0
193 Locked OFDM PLC 722000000 Hz 10.8 dBmV 44.0 dB 21724522 0
194 Locked OFDM PLC 957000000 Hz 8.4 dBmV 43.0 dB 185666968 11


Upstream Bonded Channels
Channel ID Lock Status US Channel Type Frequency Width Power
3 Locked SC-QAM 29200000 Hz 6400000 39.0 dBmV
4 Locked SC-QAM 35600000 Hz 6400000 39.3 dBmV
1 Locked SC-QAM 16400000 Hz 6400000 38.5 dBmV
2 Locked SC-QAM 22800000 Hz 6400000 38.8 dBmV
41 Locked OFDMA 36200000 Hz 44400000 34.2 dBmV


07/30/2025 16:28:51 Notice Successful LAN WebGUI login from 71.56.219.185 on 07/30/25 at 4:28 PM

 

07/30/2025 16:27:01 Notice Successful LAN WebGUI login from 71.56.219.185 on 07/30/25 at 4:27 PM

07/30/2025 16:22:57 Critical             No Ranging Response received - T3 time-out;CM-MAC=f8:20:d2:XX:XX:XX;CMTS-MAC=00:90:f0:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

07/30/2025 15:07:32 Notice Successful LAN WebGUI login from 71.56.219.185 on 07/30/25 at 3:07 PM

07/30/2025 14:32:27 Critical             No Ranging Response received - T3 time-out;CM-MAC=f8:20:d2:XX:XX:XX;CMTS-MAC=00:90:f0:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

07/30/2025 14:10:42 Notice Successful LAN WebGUI login from 71.56.219.185 on 07/30/25 at 2:10 PM

07/30/2025 14:07:11 Critical             No Ranging Response received - T3 time-out;CM-MAC=f8:20:d2:XX:XX:XX;CMTS-MAC=00:90:f0:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

07/30/2025 12:44:01 Notice US profile assignment change. US Chan ID: 41; Previous Profile: 10; New Profile: 12.;CM-MAC=f8:20:d2:XX:XX:XX;CMTS-MAC=00:90:f0:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

07/30/2025 12:37:01 Notice US profile assignment change. US Chan ID: 41; Previous Profile: 11; New Profile: 10.;CM-MAC=f8:20:d2:XX:XX:XX;CMTS-MAC=00:90:f0:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

07/30/2025 12:34:46 Notice US profile assignment change. US Chan ID: 41; Previous Profile: 12; New Profile: 11.;CM-MAC=f8:20:d2:XX:XX:XX;CMTS-MAC=00:90:f0:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

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7 days ago

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rzedaker

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6 Messages

@EG​ I posted everything I could from the modem logs and settings, any thoughts?

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5 days ago

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EG

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112.3K Messages

6 days ago

This may or may not be the root cause of the problem (YMMV), but it should be addressed regardless. The downstream power is too high. Are you sure there are no amplifiers somewhere on the coax line leading to the modem ?

(edited)

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rzedaker

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They actually removed an amplifier and that improved disconnects but sounds like the speed is too high. Ironically the increased my speed. I guess I'll go back to Comcast support, although that has been a challenge.

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5 days ago

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EG

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112.3K Messages

5 days ago

I'll repeat this again for posterity's sake. This may or may not be the root cause of the problem (YMMV).

Ok so if there are no amps on the line, you can try installing a -6 dB attenuator pad such as this one on the coax port on the rear of the modem to knock that power level down and see;

https://www.amazon.com/6db-Attenuator-Pad-1-each/dp/B0013L48XA 

Please post back with how it goes.

(edited)

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rzedaker

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6 Messages

My apologizes EG, I didn't realize you responded.  Thanks for all the guidance.  I'll see what goes on.

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5 days ago

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EG

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112.3K Messages

@rzedaker 

No worries ! Good luck with it !

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

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5 days ago

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XfinityAbby

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440 Messages

5 days ago

Hello @rzedaker. I just wanted to circle back to this and see if you found a solution based on EG's responses? Please let us know if you still need assistance! 

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rzedaker

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6 Messages

@XfinityAbby​ I ordered the attenuator. Will let you know 

Thanks

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5 days ago

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XfinityAlfonso

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1.9K Messages

We look forward to hearing from you once you've had a chance to test that out! 

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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5 days ago

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XfinityAlfonso

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1.9K Messages

Hey there rzedaker we're just checking in- how's the new attenuator treating you? 

 

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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21 hours ago

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