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Friday, January 3rd, 2025 6:58 PM

Internet connection drops out for a few minutes each day: T3 Time Outs, Started Unicast Maintenance Ranging - No Response received errors

Hi,

I have a Nighthawk CM2000 modem that has worked great for the 2 years I've had xfinity service in this house, but in the last few days I've been getting full drops of internet service (usually for a few minutes at a time). Restarting the router or waiting it out usually fixes the issue, but it's unacceptable to happen this frequently.

On the modem logs, I'm seeing errors for T3 Time Outs, Started Unicast Maintenance Ranging - No Response received errors during the times of experiencing issues. Some research into this seems to indicate an upstream signal issue which my power level seems a little low at 36 dBmV. Based on these logs, is that my primary issue? Do I need to increase the upstream signal power level or what can be done to resolve these issues?

Thank you. I've attached the logs below:

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 393000000 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 393000000 Hz 4.7 dBmV 42.7 dB 16380 70381
2 Locked QAM256 5 399000000 Hz 4.8 dBmV 42.7 dB 17252 74586
3 Locked QAM256 6 405000000 Hz 4.8 dBmV 42.7 dB 23289 104174
4 Locked QAM256 7 411000000 Hz 4.9 dBmV 42.6 dB 30368 136215
5 Locked QAM256 8 417000000 Hz 5.0 dBmV 42.7 dB 35335 158622
6 Locked QAM256 9 423000000 Hz 5.0 dBmV 42.7 dB 28399 127340
7 Locked QAM256 10 429000000 Hz 5.3 dBmV 42.9 dB 34196 154148
8 Locked QAM256 11 435000000 Hz 5.3 dBmV 42.7 dB 38042 171716
9 Locked QAM256 12 441000000 Hz 5.3 dBmV 42.6 dB 26069 113577
10 Locked QAM256 13 447000000 Hz 5.5 dBmV 42.8 dB 36137 157645
11 Locked QAM256 14 453000000 Hz 5.6 dBmV 43.0 dB 33591 149525
12 Locked QAM256 15 459000000 Hz 5.6 dBmV 43.0 dB 21555 91199
13 Locked QAM256 16 465000000 Hz 5.5 dBmV 42.9 dB 31236 135656
14 Locked QAM256 17 471000000 Hz 5.6 dBmV 43.0 dB 32047 141155
15 Locked QAM256 18 477000000 Hz 5.7 dBmV 43.1 dB 31505 138382
16 Locked QAM256 19 483000000 Hz 5.7 dBmV 43.1 dB 35485 157191
17 Locked QAM256 20 489000000 Hz 5.5 dBmV 42.9 dB 37029 165779
18 Locked QAM256 21 495000000 Hz 5.5 dBmV 42.9 dB 35561 158003
19 Locked QAM256 22 507000000 Hz 5.6 dBmV 43.1 dB 33997 149010
20 Locked QAM256 23 513000000 Hz 5.5 dBmV 43.1 dB 33561 145577
21 Locked QAM256 24 519000000 Hz 5.4 dBmV 43.1 dB 31859 136875
22 Locked QAM256 25 525000000 Hz 5.4 dBmV 43.0 dB 29155 126343
23 Locked QAM256 26 531000000 Hz 5.5 dBmV 43.1 dB 28210 120975
24 Locked QAM256 27 537000000 Hz 5.5 dBmV 43.1 dB 29221 125885
25 Locked QAM256 28 543000000 Hz 5.5 dBmV 43.1 dB 32216 140622
26 Locked QAM256 29 549000000 Hz 5.7 dBmV 43.2 dB 33417 145812
27 Locked QAM256 30 555000000 Hz 5.8 dBmV 43.2 dB 33037 146158
28 Locked QAM256 31 561000000 Hz 5.8 dBmV 43.2 dB 22709 96210
29 Locked QAM256 32 567000000 Hz 5.8 dBmV 43.2 dB 32417 139702
30 Locked QAM256 33 573000000 Hz 5.7 dBmV 43.1 dB 30344 132356
31 Locked QAM256 34 579000000 Hz 5.6 dBmV 43.0 dB 29651 127003
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 1 5120 Ksym/sec 16400000 Hz 35.8 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 35.8 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 36.0 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 36.0 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 48 688000000 Hz 4.98 dBmV 42.4 dB 928 ~ 3167 5353941154 3971059237 796104
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

Logs:

Time Priority Description
Thu Jan 02 10:09:25 2025 (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=3.1;
Thu Jan 02 07:00:42 2025 (Critical (3)) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 07:00:42 2025 (Notice (6)) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 07:00:41 2025 (Notice (6)) TLV-11 - unrecognized OID;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 07:00:30 2025 (Notice (6)) Honoring MDD; IP provisioning mode = IPv6
Thu Jan 02 07:00:14 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:59:53 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:59:03 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:58:53 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:58:02 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:57:54 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:56:58 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:56:49 2025 (Warning (5)) ToD request sent - No Response received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:56:49 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:56:46 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:56:44 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:56:36 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:54:43 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 7; Chan ID: 1 3; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:54:40 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:54:13 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 7; Chan ID: 1 3; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:56 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:42 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 7; Chan ID: 1 3; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:33 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:32 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 24; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:16 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:12 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 7; Chan ID: 1 3; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:53:12 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 24; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:54 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:51 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 24; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:48 2025 (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=3.1;
Thu Jan 02 06:52:44 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:42 2025 (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=3.1;
Thu Jan 02 06:52:42 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:42 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 7; Chan ID: 1 3; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:41 2025 (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=3.1;
Thu Jan 02 06:52:32 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:31 2025 (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=3.1;
Thu Jan 02 06:52:26 2025 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:23 2025 (Critical (3)) 16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan 02 06:52:23 2025 (Critical (3)) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Question

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XfinityMarcos

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2.1K Messages

1 month ago

Hello mart.nb, thank you for reaching out to our Forum and for being so detailed in your post, it really helps. Your upstream power level should be between 25 and 54 dBmV, so it sounds like that may not be an immediate concern. Let's go through a few more clarifying questions to get on the same page. Are you using a standalone router along with your modem? Are you seeing the intermittent connection on all devices or just one? And finally, are you seeing this over Wi-Fi, ethernet, or both types of connections?

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EG

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