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Constant T3 errors. Internet keeps dropping in and out all throughout the day.
I have had multiple Xfinity technicians come out. Sometimes, the internet will be fine for a week or more, but then I will have multiple days where the internet is basically unusable.
I have one coax cable going directly from the outside line to my modem. I have tried both Xfinity's modem and my own. Below you can find my connection levels and my event log. This is after a reboot, so the uncorrected/corrected values are way lower than usual. Before I rebooted they were into 7 or 8 digits (if I recall correctly).
It almost certainly seems to be an issue in my area. I have called Xfinity dozens of times, gone through the standard troubleshooting so many times. Is there anything that can be done to get Xfinity to actually fix my issue?
Downstream Bonded Channels:
Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
1 Locked QAM256 5 495.0 2.2 40.0 182 32
2 Locked QAM256 2 477.0 2.9 40.7 467 2420
3 Locked QAM256 3 483.0 2.1 40.1 919 4758
4 Locked QAM256 4 489.0 1.8 40.0 933 4746
5 Locked QAM256 6 507.0 3.0 40.2 797 4271
6 Locked QAM256 7 513.0 3.8 40.4 1062 5138
7 Locked QAM256 8 519.0 4.4 40.4 790 4279
8 Locked QAM256 9 525.0 4.5 40.3 710 3770
9 Locked QAM256 10 531.0 4.6 40.2 802 4262
10 Locked QAM256 11 537.0 4.1 40.1 870 4599
11 Locked QAM256 12 543.0 3.4 39.8 971 4702
12 Locked QAM256 13 549.0 2.6 39.6 1109 5278
13 Locked QAM256 14 555.0 1.9 39.2 992 4777
14 Locked QAM256 15 561.0 1.7 39.1 1478 7672
15 Locked QAM256 16 567.0 1.5 39.0 1089 5753
16 Locked QAM256 17 573.0 1.8 39.1 1127 5709
17 Locked QAM256 18 579.0 1.9 39.1 1108 5641
18 Locked QAM256 19 585.0 1.9 39.0 1120 5722
19 Locked QAM256 20 591.0 1.9 38.9 1148 5687
20 Locked QAM256 21 597.0 2.0 38.7 1031 5270
21 Locked QAM256 22 603.0 2.0 38.7 1008 5305
22 Locked QAM256 23 609.0 2.0 38.9 1857 9249
23 Locked QAM256 24 615.0 2.3 39.1 816 4315
24 Locked QAM256 25 621.0 2.8 39.0 639 3309
25 Locked QAM256 26 627.0 2.5 38.8 973 4912
26 Locked QAM256 27 633.0 2.4 38.3 585 2847
27 Locked QAM256 28 639.0 2.3 38.2 1032 5265
28 Locked QAM256 29 645.0 2.0 39.0 652 3485
29 Locked QAM256 30 651.0 1.5 38.8 1038 5475
30 Locked QAM256 31 657.0 1.4 38.9 582 2959
31 Locked QAM256 32 663.0 1.6 38.8 1014 5455
32 Locked OFDM PLC 37 678.0 1.7 38.3 4433487 1074Upstream Bonded Channels:
Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
1 Locked SC-QAM 1 5120 35.6 40.5
2 Locked SC-QAM 2 5120 29.2 41.3
3 Locked SC-QAM 3 5120 22.8 41.8
4 Locked SC-QAM 4 5120 16.4 42.3
5 Locked SC-QAM 5 1280 39.6 39.5Event Log (CM-MAC has been redacted):
16:16:45
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:16:51
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:16:54
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:16:58
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:17:00
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:17:06
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:17:06
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:17:07
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:19:23
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:19:53
Thu Jun 17 2021 Notice (6) Honoring MDD; IP provisioning mode = IPv6
16:20:04
Thu Jun 17 2021 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:20:13
Thu Jun 17 2021 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:25:51
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:25:52
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:25:53
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:25:56
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:25:58
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:00
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:04
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:04
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:09
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:19
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:19
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:26:26
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:30:45
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:32:10
Thu Jun 17 2021 Notice (6) Honoring MDD; IP provisioning mode = IPv6
16:32:22
Thu Jun 17 2021 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:32:31
Thu Jun 17 2021 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:32:38
Thu Jun 17 2021 Notice (6) CM-STATUS message sent. Event Type Code: 5; Chan ID: 11 12 13 14 15 16 17 18 19; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:32:43
Thu Jun 17 2021 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 11 12 13 14 15 16 17 18 19; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:32:50
Thu Jun 17 2021 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
16:32:54
Thu Jun 17 2021 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=REDACTED;CMTS-MAC=00:01:5c:7e:e8:60;CM-QOS=1.1;CM-VER=3.1;
No Responses!