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Sudden Onset Frequent T3/T4 Timeouts (SOFTTT)

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Sudden Onset Frequent T3/T4 Timeouts (SOFTTT)

Hi folks. Over the past two or three weeks my connection has suddenly begun disconnecting frequently. I read enough to learn about the event log and found that the drops are illustrated by T3 and T4 timeout errors. Nothing about the wiring or the hardware in the house has changed. I tried eliminating a splitter, and that had no effect. Cables look good, connections are tight, modem (Netgear C3000-100NAS) stats seem ok during normal operation.

Downstream:

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 13 507000000 Hz 9.6 dBmV 43.9 dB 0 0
2 Locked QAM256 9 477000000 Hz 9.8 dBmV 43.9 dB 0 0
3 Locked QAM256 10 483000000 Hz 9.8 dBmV 43.9 dB 0 0
4 Locked QAM256 11 489000000 Hz 9.8 dBmV 43.9 dB 0 0
5 Locked QAM256 12 495000000 Hz 10.1 dBmV 44.6 dB 0 0
6 Locked QAM256 14 513000000 Hz 9.6 dBmV 43.9 dB 0 0
7 Locked QAM256 15 519000000 Hz 9.5 dBmV 43.9 dB 0 0
8 Locked QAM256 16 525000000 Hz 9.4 dBmV 43.8 dB 0 0

 

Upstream:

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 23700000 Hz 45.7 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 36500000 Hz 45.3 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 30100000 Hz 44.8 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 17300000 Hz 44.8 dBmV

 

Here is the log this morning:

Time Priority Description
2020-7-1, 11:01:09 Warning (5) Dynamic Range Window violation
2020-7-1, 10:55:53 Warning (5) Unicast DSID PSN startup error
2020-7-1, 10:55:27 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2020-7-1, 10:55:13 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.0;CM-VER=3.0;
2020-7-1, 10:55:01 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:54:53 Warning (5) Dynamic Range Window violation
2020-7-1, 10:54:48 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:54:42 Warning (5) Dynamic Range Window violation
2020-7-1, 10:54:41 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:54:32 Warning (5) Dynamic Range Window violation
2020-7-1, 10:54:28 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:54:12 Warning (5) Dynamic Range Window violation
2020-7-1, 10:54:08 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:53:33 Warning (5) Dynamic Range Window violation
2020-7-1, 10:53:01 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:52:33 Warning (5) Dynamic Range Window violation
2020-7-1, 10:52:28 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:52:12 Warning (5) Dynamic Range Window violation
2020-7-1, 10:44:22 Warning (5) Unicast DSID PSN startup error
1970-1-1, 00:01:04 Notice (6) Honoring MDD; IP provisioning mode = IPv6
1970-1-1, 00:00:36 Notice (6) WiFi Interface [wl0] set to Channel 6 (Side-Band Channel:10) - Reason:INIT
1970-1-1, 00:00:33 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-7-1, 10:42:28 Critical (3) Resetting the cable modem due to docsDevResetNow
2020-7-1, 10:42:09 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:32 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-7-1, 10:39:31 Critical (3) Resetting the cable modem due to docsDevResetNow
2020-7-1, 10:29:26 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.0;CM-VER=3.0;
2020-7-1, 10:29:13 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:29:01 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:28:46 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:28:41 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:28:14 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:28:13 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:27:41 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:26:33 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:26:01 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 10:05:36 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 09:59:36 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 09:59:04 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;
2020-7-1, 09:57:38 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:7f:b9:e0:e7:10;CMTS-MAC=00:56:2b:76:c4:ee;CM-QOS=1.1;CM-VER=3.0;

 

Does anything stand out? Thanks for reading!

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Regular Visitor

Re: Sudden Onset Frequent T3/T4 Timeouts (SOFTTT)

I'd also like to add that I've tried resetting the modem many times, renewing the IP lease, gone through all the FAQ's and the Xfinity AI chat thing which tries to reset the modem and then just Error 500's out every time. Not very useful.

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Regular Visitor

Re: Sudden Onset Frequent T3/T4 Timeouts (SOFTTT)

Double tap due to, you guessed it, a timeout error!

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Regular Visitor

Re: Sudden Onset Frequent T3/T4 Timeouts (SOFTTT)

Update: Got through to customer service today. They could not detect an issue despite a timeout occurring while I was on the line with them, but assured me that they'd monitor my connection and trigger an automated call should my connection go down. There have been at least 11 T3 or T4 timeouts since (about an hour and a half ago), and no call. Not looking hopeful.