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Sunday, May 12th, 2024 8:29 PM

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Internet constantly losing connection - Multiple Errors Reported by my Netgear CM1000v2 Cable Modem Log T3/T4/Sync Timin/UCD invalid

Xfinity Internet - 500Mbps Download Package

Netgear - CM1000v2 - Cable Modem - (Firmware v10.01.07)

Internet has been fine for over 4 years, last week connection started to drop out every 2 hours or so. Now it's dropping every 5-10 minutes.

I only use wi-fi for phone etc, everything else is wired. I lose both LAN and wi-fi.

No splitters, all new cables. I first thought it might be the router (Netgear xr300) so I plugged my computer directly into the modem. Did not solve the issue.

Logs and Connection Stats are as follows:

Time Priority Description
2024-05-12, 20:09:23 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 20:08:55 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.
2024-05-12, 20:08:08 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 19:39:31 Critical (3) UCD invalid or channel unusable;
2024-05-12, 19:39:31 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;
2024-05-12, 19:39:20 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2024-05-12, 19:39:15 Critical (3) UCD invalid or channel unusable;
2024-05-12, 19:38:55 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2024-05-12, 19:38:41 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2024-05-12, 19:30:37 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 19:29:37 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;
2024-05-12, 19:19:24 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out
2024-05-12, 19:18:41 Warning (5) Dynamic Range Window violation
2024-05-12, 19:18:41 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;
2024-05-12, 19:14:29 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 19:10:21 Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;
2024-05-12, 19:06:03 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 19:06:03 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;
2024-05-12, 19:06:03 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 19:03:07 Critical (3) UCD invalid or channel unusable;
2024-05-12, 19:03:07 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;
2024-05-12, 19:02:57 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2024-05-12, 19:02:52 Critical (3) UCD invalid or channel unusable;
2024-05-12, 19:02:30 Notice (6) Honoring MDD; IP provisioning mode = IPv6
2024-05-12, 19:02:19 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;
2024-05-12, 19:01:44 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2024-05-12, 19:01:38 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2024-05-12, 19:01:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2024-05-12, 19:01:37 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
2024-05-12, 19:00:57 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2024-05-12, 19:00:54 Warning (5) MDD message timeout;
2024-05-12, 19:00:49 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2024-05-12, 19:00:45 Warning (5) MDD message timeout;
2024-05-12, 19:00:45 Notice (6) CM-STATUS message sent. Event Type Code: 2; Chan ID: 24 26; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;
2024-05-12, 18:51:56 Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;
2024-05-12, 18:48:58 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;
2024-05-12, 18:47:03 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;
2024-05-12, 18:40:16 Warning (5) Dynamic Range Window violation
2024-05-12, 18:40:16 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;
2024-05-12, 18:39:44 Critical (3) UCD invalid or channel unusable;

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 711000000 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 44 711000000 Hz 12.3 dBmV 43.9 dB 206325110 784 2361
2 Locked QAM256 13 525000000 Hz 12.3 dBmV 44.4 dB 203460722 4958 8837
3 Locked QAM256 14 531000000 Hz 12.0 dBmV 44.3 dB 213547814 13059 9223
4 Locked QAM256 15 537000000 Hz 11.8 dBmV 44.1 dB 203411821 12639 14272
5 Locked QAM256 16 543000000 Hz 11.9 dBmV 44.4 dB 213606604 13666 8413
6 Locked QAM256 17 549000000 Hz 12.3 dBmV 44.5 dB 203461579 6788 11153
7 Locked QAM256 18 555000000 Hz 12.1 dBmV 44.3 dB 213613852 8335 13884
8 Locked QAM256 19 561000000 Hz 12.0 dBmV 44.2 dB 203502668 4053 8409
9 Locked QAM256 20 567000000 Hz 12.2 dBmV 44.3 dB 203336530 1124 3219
10 Locked QAM256 21 573000000 Hz 12.5 dBmV 44.6 dB 203348812 6781 23883
11 Locked QAM256 22 579000000 Hz 12.4 dBmV 44.4 dB 203356492 732 1760
12 Locked QAM256 23 585000000 Hz 11.9 dBmV 44.1 dB 203518138 8570 14595
13 Locked QAM256 24 591000000 Hz 12.0 dBmV 44.0 dB 203376584 812 2573
14 Locked QAM256 25 597000000 Hz 12.6 dBmV 44.4 dB 203451738 22198 33752
15 Locked QAM256 26 603000000 Hz 12.6 dBmV 44.4 dB 203395042 838 2305
16 Locked QAM256 27 609000000 Hz 12.0 dBmV 44.0 dB 213566160 26475 34354
17 Locked QAM256 28 615000000 Hz 11.8 dBmV 43.9 dB 213711803 8841 7837
18 Locked QAM256 29 621000000 Hz 12.4 dBmV 44.2 dB 213701708 9835 21587
19 Locked QAM256 30 627000000 Hz 12.5 dBmV 44.4 dB 203571765 8332 19209
20 Locked QAM256 31 633000000 Hz 12.0 dBmV 44.1 dB 213740586 6210 7879
21 Locked QAM256 32 639000000 Hz 11.8 dBmV 43.9 dB 203635059 3871 3688
22 Locked QAM256 33 645000000 Hz 12.0 dBmV 44.1 dB 213764673 3994 8665
23 Locked QAM256 34 651000000 Hz 12.3 dBmV 44.4 dB 203641582 3725 8396
24 Locked QAM256 35 657000000 Hz 11.8 dBmV 44.2 dB 213778657 5145 7024
25 Locked QAM256 36 663000000 Hz 11.2 dBmV 43.7 dB 203656039 3175 7285
26 Locked QAM256 37 669000000 Hz 11.2 dBmV 44.0 dB 213802742 3192 4992
27 Locked QAM256 38 675000000 Hz 11.9 dBmV 44.1 dB 203673324 6119 7038
28 Locked QAM256 39 681000000 Hz 11.8 dBmV 44.2 dB 213820996 4132 4950
29 Locked QAM256 40 687000000 Hz 11.2 dBmV 43.8 dB 203697972 3387 6287
30 Locked QAM256 41 693000000 Hz 11.0 dBmV 43.5 dB 203723180 6760 5507
31 Locked QAM256 42 699000000 Hz 11.5 dBmV 43.8 dB 203739937 4464 6159
32 Locked QAM256 43 705000000 Hz 11.8 dBmV 44.1 dB 203758486 3604 3564
Upstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 17 16400000 Hz 48.3 dBmV
2 Locked ATDMA 18 22800000 Hz 45.3 dBmV
3 Locked ATDMA 19 29200000 Hz 47.8 dBmV
4 Locked ATDMA 20 35600000 Hz 48.5 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 957000000 Hz 14.6 dBmV 43.8 dB 148 ~ 3947 51507466 605168 17578
2 Not Locked 0 0 0 Hz 7.9 dBmV 0.0 dB 0 ~ 4095 0 0 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

Official Employee

 • 

1.1K Messages

1 year ago

Hey band_of_gypsys, thanks for reaching out to Xfinity Support on our Forums and for sending the logs. It does look like the downstream power levels are a little higher than they should be. I'd like to check to see if there is something going on in the area. When you get a chance, can you send us a direct message?

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