Contributor
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16 Messages
Repeated short Internet Connection Drops, almost daily Now
Ok, this is driving my batty, it's been going on now for several months, and here's the fun part, it's continued through 2 ISP's, Astound/RCN and now Xfinity, and 3 modems, 2 Netgear C7000 Doscis 3 Modem/Routers and now with a Netgear CM1100 Doscis 3.1 Modem. I've had techs out here many times, they've tested the lines, they've replace the pole to house feed, they've checked inside and I'm told everything is fine. We had internet in this house for YEARS without issue, and then gradually more and more these short drops started coming. Goes down for a minute to 3 and back. Here are the logs and stats. Would LOVE an actual solution
2025-04-11, 07:49:05 Critical (3) UCD invalid or channel unusable;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:49:05 Notice (6) DS profile assignment change. DS Chan ID: 33; 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;
2025-04-11, 07:49:04 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;
2025-04-11, 07:48:34 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2025-04-11, 07:48:29 Critical (3) UCD invalid or channel unusable;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:44:06 Critical (3) DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:43:19 Critical (3) DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:42:37 Critical (3) DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:41:53 Critical (3) DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:41:10 Critical (3) UCD invalid or channel unusable;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:39:30 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:39:19 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:39:09 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:39:05 Critical (3) TFTP Request Retries exceeded, CM unable to register
2025-04-11, 07:39:05 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:38:19 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:38:09 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:38:01 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:37:58 Critical (3) TFTP Request Retries exceeded, CM unable to register
2025-04-11, 07:37:58 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:37:12 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:37:02 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:36:54 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:36:50 Critical (3) TFTP Request Retries exceeded, CM unable to register
2025-04-11, 07:36:50 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:36:04 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:35:54 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:35:46 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:35:36 Critical (3) TFTP Request Retries exceeded, CM unable to register
2025-04-11, 07:35:36 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:34:50 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:34:41 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2025-04-11, 07:34:39 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;
2025-04-11, 07:33:15 Critical (3) No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Starting Frequency
465000000
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 465000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 12 465000000 Hz 1.9 dBmV 46.0 dB 806148672 0 0
2 Locked QAM256 1 399000000 Hz 1.7 dBmV 45.8 dB 804476076 0 0
3 Locked QAM256 2 405000000 Hz 1.7 dBmV 45.9 dB 804481193 0 0
4 Locked QAM256 3 411000000 Hz 1.7 dBmV 45.8 dB 804484852 0 0
5 Locked QAM256 4 417000000 Hz 1.7 dBmV 45.7 dB 804489072 0 0
6 Locked QAM256 5 423000000 Hz 2.2 dBmV 46.1 dB 804493069 0 0
7 Locked QAM256 6 429000000 Hz 2.5 dBmV 46.2 dB 804497121 0 0
8 Locked QAM256 7 435000000 Hz 2.4 dBmV 46.2 dB 804500855 0 0
9 Locked QAM256 8 441000000 Hz 2.3 dBmV 46.2 dB 804504368 0 0
10 Locked QAM256 9 447000000 Hz 2.2 dBmV 46.1 dB 804508499 0 0
11 Locked QAM256 10 453000000 Hz 1.9 dBmV 45.9 dB 804512164 0 0
12 Locked QAM256 11 459000000 Hz 1.6 dBmV 45.7 dB 804515943 0 0
13 Locked QAM256 13 471000000 Hz 2.2 dBmV 46.1 dB 804519651 0 0
14 Locked QAM256 14 477000000 Hz 2.5 dBmV 46.3 dB 804523733 0 0
15 Locked QAM256 15 483000000 Hz 2.5 dBmV 46.5 dB 804527259 0 0
16 Locked QAM256 16 489000000 Hz 2.4 dBmV 46.1 dB 804530980 0 0
17 Locked QAM256 17 495000000 Hz 2.4 dBmV 46.0 dB 804534769 0 0
18 Locked QAM256 18 501000000 Hz 2.2 dBmV 45.9 dB 804538937 0 0
19 Locked QAM256 19 507000000 Hz 2.3 dBmV 46.0 dB 804542348 0 0
20 Locked QAM256 20 513000000 Hz 2.1 dBmV 46.0 dB 804546197 0 0
21 Locked QAM256 21 519000000 Hz 2.3 dBmV 46.0 dB 804549699 0 0
22 Locked QAM256 22 525000000 Hz 2.1 dBmV 46.0 dB 804553782 0 0
23 Locked QAM256 23 531000000 Hz 2.2 dBmV 46.0 dB 804557503 0 0
24 Locked QAM256 24 537000000 Hz 1.9 dBmV 45.8 dB 804560780 0 0
25 Locked QAM256 25 543000000 Hz 1.8 dBmV 45.8 dB 804564014 0 0
26 Locked QAM256 26 549000000 Hz 1.4 dBmV 45.5 dB 804567849 0 0
27 Locked QAM256 27 555000000 Hz 0.7 dBmV 45.0 dB 804572030 0 0
28 Locked QAM256 28 561000000 Hz 0.6 dBmV 44.6 dB 804575528 0 0
29 Locked QAM256 29 567000000 Hz 0.6 dBmV 44.6 dB 804579275 0 0
30 Locked QAM256 30 573000000 Hz 0.6 dBmV 44.4 dB 804583426 0 0
31 Locked QAM256 31 579000000 Hz 1.0 dBmV 44.7 dB 804580359 0 0
32 Locked QAM256 32 585000000 Hz 1.0 dBmV 44.9 dB 804581655 0 0
Upstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 16400000 Hz 45.3 dBmV
2 Locked ATDMA 2 22800000 Hz 45.5 dBmV
3 Locked ATDMA 3 29200000 Hz 45.5 dBmV
4 Locked ATDMA 4 35600000 Hz 45.5 dBmV
5 Not Locked Unknown 0 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Hz 0.0 dBmV
Downstream OFDM Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked 0, 1, 2, 3 193 690000000 Hz 1.9 dBmV 43.3 dB 568 ~ 3527 136148182 52427471 0
2 Locked 0, 1, 2, 3 194 957000000 Hz 1.6 dBmV 43.0 dB 148 ~ 3947 138793287 8456880 0
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked Unknown 0 0 Hz 0 dBmV
2 Not Locked Unknown 0 0 Hz 0 dBmV
XfinityJosephA
Official Employee
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1.7K Messages
2 days ago
TotalPC feel free to send us a direct message so we can take a closer look at your connection and service. You can use the Direct Messaging icon at the top of the page to send your name and service address to "Xfinity Support." It's next to the bell icon on the right side of the page.
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