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Monday, July 22nd, 2024 1:37 AM

Frequent T3 timeouts

Was looking for some help on the frequent disconnect issues I have been facing the last 5 days.  Have worked with support a few times regarding this but clears after reboots and no further investigation is completed.  Last night one tech found my modem had a bad config file and was updated but still today packet loss and drops were seen.  Looking through the logs full of T3 timeout errors and timing is lost.  The modem is a Motorola MB8600 and service has been rock solid for years but all of a sudden this week issues.  I have checked connections from the handoff and it is one straight run with no splitters.  I have included the model stats and log events.  Any help or support would be appreciated.

19:03:54
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:03:55
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:03:59
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:03:59
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:02
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:04
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:06
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:06
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:11
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:12
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:14
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:15
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:17
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:17
Sat Jul 20 2024 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:17
Sat Jul 20 2024 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:17
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:18
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:18
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:19
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:19
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:21
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:27
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:34
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:39
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:40
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:40
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:41
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:46
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:47
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:51
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:51
Sat Jul 20 2024 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:51
Sat Jul 20 2024 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:51
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:53
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:53
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:54
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:04:54
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:00
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:12
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:12
Sat Jul 20 2024 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:12
Sat Jul 20 2024 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:21
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:22
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:24
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:24
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:26
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:05:34
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:06:13
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:07:04
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:07:43
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:07:59
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:08:40
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:13
Sat Jul 20 2024 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:14
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:15
Sat Jul 20 2024 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:19
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:19
Sat Jul 20 2024 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:22
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:25
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:29
Sat Jul 20 2024 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:29
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:32
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:34
Sat Jul 20 2024 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:09:39
Sat Jul 20 2024 Critical (3) CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.
19:09:41
Sat Jul 20 2024 Critical (3) CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.
19:10:12
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
19:10:47
Sat Jul 20 2024 Critical (3) CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.
19:10:47
Sat Jul 20 2024 Critical (3) CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.
19:10:47
Sat Jul 20 2024 Critical (3) CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
20:54:16
Sat Jul 20 2024 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
20:54:23
Sat Jul 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
20:59:29
Sat Jul 20 2024 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
20:59:35
Sat Jul 20 2024 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
21:01:15
Sat Jul 20 2024 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
21:01:28
Sat Jul 20 2024 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
21:01:36
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
21:02:24
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
21:02:34
Sat Jul 20 2024 Critical (3) CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.
21:02:38
Sat Jul 20 2024 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REMOVED;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
21:02:39
Sat Jul 20 2024 Critical (3) CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.
21:02:57
Sat Jul 20 2024 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;
21:03:16
Sat Jul 20 2024 Critical (3) CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.
21:03:16
Sat Jul 20 2024 Critical (3) CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.
21:03:16
Sat Jul 20 2024 Critical (3) CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Notice (6)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
Time Not Established
Critical (3)
21:17:54
Sat Jul 20 2024 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=REMOVED;CMTS-MAC=REMOVED;CM-QOS=1.1;CM-VER=3.1;

   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 8 429.0 6.8 43.9 0 0
   2 Locked QAM256 4 405.0 7.0 44.3 0 0
   3 Locked QAM256 5 411.0 6.9 44.3 0 0
   4 Locked QAM256 6 417.0 6.9 44.2 0 0
   5 Locked QAM256 7 423.0 6.6 44.0 0 0
   6 Locked QAM256 9 435.0 6.7 44.0 0 0
   7 Locked QAM256 10 441.0 6.6 44.0 0 0
   8 Locked QAM256 11 447.0 6.6 44.0 0 0
   9 Locked QAM256 12 453.0 6.5 43.8 0 0
   10 Locked QAM256 13 459.0 6.7 43.8 0 0
   11 Locked QAM256 14 465.0 6.5 44.0 0 0
   12 Locked QAM256 15 471.0 6.4 43.7 0 0
   13 Locked QAM256 16 477.0 6.4 43.8 0 0
   14 Locked QAM256 17 483.0 6.1 43.7 0 0
   15 Locked QAM256 18 489.0 6.3 43.8 0 0
   16 Locked QAM256 19 495.0 6.0 43.6 0 0
   17 Locked QAM256 20 507.0 5.9 43.7 0 0
   18 Locked QAM256 21 513.0 5.4 43.5 0 0
   19 Locked QAM256 22 519.0 5.3 43.4 0 0
   20 Locked QAM256 23 525.0 4.9 43.3 0 0
   21 Locked QAM256 24 531.0 5.0 43.3 0 0
   22 Locked QAM256 25 537.0 4.6 43.0 0 0
   23 Locked QAM256 26 543.0 4.5 43.1 0 0
   24 Locked QAM256 27 549.0 4.3 43.0 0 0
   25 Locked QAM256 28 555.0 3.8 42.8 0 0
   26 Locked QAM256 29 561.0 4.1 42.9 0 0
   27 Locked QAM256 30 567.0 3.8 42.7 0 0
   28 Locked QAM256 31 573.0 3.7 42.7 0 0
   29 Locked QAM256 32 579.0 3.8 42.7 0 0
   30 Locked QAM256 33 585.0 3.9 42.7 0 0
   31 Locked QAM256 34 591.0 4.0 42.7 0 0
   32 Locked OFDM PLC 48 722.0 5.0 43.1 1209864912 0

Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 1 2560 10.4 41.0
   2 Locked SC-QAM 2 5120 16.4 41.3
   3 Locked SC-QAM 3 5120 22.8 40.8
   4 Locked SC-QAM 4 5120 29.2 40.8
   5 Locked SC-QAM 5 5120 35.6 39.3
   6 Locked SC-QAM 6 2560 40.4 41.3

Official Employee

 • 

2.1K Messages

2 months ago

Hi there, premierdka! I am sorry to hear that your service is giving you trouble. We are happy to help and appreciate your detailed post along with your modem logs. I am not seeing the root cause of this from the logs. Since you have completed troubleshooting steps with our teams already, I would like to take a look at your account from here. 

Please send us a direct message with your full name and complete service address to “Xfinity Support”. To do so, click on the direct messaging icon located at the top right of this forums page.

Here's the detailed steps to direct message us:
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2 Messages

@XfinityRay​ Thank you and sorry for the delay I was out of town and service had been stable but I had the same issue this morning with the service and had to complete a hard power cycle to recover.

Expert

 • 

106K Messages

2 months ago

@XfinityRay 

FWIW. The losses of block sync and the T3 timeouts are quite obvious.... And the error log entries can never point to a "root cause"...... They just indicate that there is a general communication impairment between the modem and the system somewhere that requires further physical investigation of the premises and the plant's hardware.....

(edited)

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