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T3 timeouts & dropping connections
As title. Hub 5, in modem mode. Physical connections checked then rebooted at 19:24 this evening to see whether timeouts issues persist - looks like yes. I think the timeouts explain the dropped connections. It's been like this for a couple of weeks now. There were lots of downstream post-RS errors prior to reboot, but it's not been rebooted for a while. 3.0 Upstream channels Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID 0 49600000 48.5 5120 QAM 64 1 1 43100000 48.5 5120 QAM 64 2 2 36600000 48.5 5120 QAM 64 3 3 30100000 48.5 5120 QAM 64 4 4 23600000 48.8 5120 QAM 64 9 3.0 Upstream channels Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts 0 ATDMA 0 0 0 0 1 ATDMA 0 0 0 0 2 ATDMA 0 0 9 0 3 ATDMA 0 0 0 0 4 ATDMA 0 0 0 0 3.1 Upstream channels Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation 10 10.4 43.7 2K QAM 256 3.1 Upstream channels Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts 10 OFDMA 208 74000000 0 0 3.0 Downstream channels Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID 1 139000000 6.2 39 QAM 256 1 2 147000000 6.6 39 QAM 256 2 3 155000000 6.6 39 QAM 256 3 4 163000000 6.8 40 QAM 256 4 5 171000000 6.9 40 QAM 256 5 6 179000000 7.1 40 QAM 256 6 7 187000000 7.2 40 QAM 256 7 8 195000000 7.8 41 QAM 256 8 9 203000000 8 41 QAM 256 9 10 211000000 8.1 41 QAM 256 10 11 219000000 8 41 QAM 256 11 12 227000000 8 41 QAM 256 12 13 235000000 8 41 QAM 256 13 14 243000000 8 41 QAM 256 14 15 251000000 7.7 41 QAM 256 15 16 259000000 7.5 40 QAM 256 16 17 267000000 7.5 40 QAM 256 17 18 275000000 7.8 41 QAM 256 18 19 283000000 8.9 41 QAM 256 19 20 291000000 9.8 41 QAM 256 20 21 299000000 10 41 QAM 256 21 22 307000000 10.2 41 QAM 256 22 23 315000000 10.3 41 QAM 256 23 24 323000000 10.4 41 QAM 256 24 25 331000000 10.3 41 QAM 256 25 26 411000000 9.9 41 QAM 256 35 27 419000000 9.7 41 QAM 256 36 28 427000000 9.8 41 QAM 256 37 29 435000000 10.3 41 QAM 256 38 30 443000000 10.7 41 QAM 256 39 31 451000000 10.9 41 QAM 256 40 3.0 Downstream channels Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors 1 Locked 39 0 0 2 Locked 39 0 0 3 Locked 39 0 0 4 Locked 40 0 0 5 Locked 40 0 0 6 Locked 40 0 0 7 Locked 40 0 0 8 Locked 41 0 0 9 Locked 41 0 0 10 Locked 41 0 0 11 Locked 41 0 0 12 Locked 41 0 0 13 Locked 41 0 0 14 Locked 41 0 0 15 Locked 41 1 0 16 Locked 40 0 0 17 Locked 40 0 0 18 Locked 41 0 0 19 Locked 41 0 0 20 Locked 41 0 0 21 Locked 41 0 0 22 Locked 41 0 0 23 Locked 41 0 0 24 Locked 41 0 0 25 Locked 41 0 0 26 Locked 41 0 0 27 Locked 41 0 0 28 Locked 41 0 0 29 Locked 41 0 0 30 Locked 41 0 0 31 Locked 41 0 0 3.1 Downstream channels Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz) 41 94 4K 1840 QAM 4096 1108 3.1 Downstream channels Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile) 41 Locked 0 10.5 268124901 0 Network Log Time Priority Description 22-01-2026 21:23:37 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 21:23:35 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 21:23:35 critical 16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 21:23:29 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 21:10:35 notice US profile assignment change. US Chan ID: 10; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 21:05:32 notice US profile assignment change. US Chan ID: 10; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 20:53:24 notice US profile assignment change. US Chan ID: 10; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 20:48:21 notice US profile assignment change. US Chan ID: 10; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:24:30 notice REGISTRATION COMPLETE - Waiting for Operational status 22-01-2026 19:24:20 notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:24:17 notice TLV-11 - unrecognized OID;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:24:14 warning DHCP WARNING - Non-critical field invalid in response ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:24:12 notice Honoring MDD; IP provisioning mode = IPv4 22-01-2026 19:24:01 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:23:59 critical Cable Modem Reboot because of - Reboot UI 22-01-2026 19:15:56 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:15:46 critical No UCDs Received - Timeout;;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 19:15:30 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 13:52:18 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 13:52:18 critical No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 13:51:44 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 13:51:42 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 13:51:42 critical 16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 12:56:28 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 01:11:30 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 01:11:29 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 22-01-2026 01:11:29 critical 16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 21-01-2026 15:49:14 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 20-01-2026 23:10:50 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 20-01-2026 23:10:48 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 20-01-2026 23:10:48 critical 16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1; 20-01-2026 23:10:42 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;steve-o16 minutes agoTuning in7Views0likes1CommentWhat we're watching now...Continuing
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