1 Message
Losing connection to CBR750 frequently
I recently got the CBR750 based on the list of supported devices from Xfinity and set it up and we have been having frequent cable connection issues requiring a reboot (seems to temporarily fix the issue) Sometimes it last a day at times a few hours in between. Also saw that I have way to many Uncorrectable. Did do a full reboot from the last firmware upgrade. Not using any splitters. No issues with the devices when connected. I have pasted some logs below.
Firmware version: V4.6.14.4
Cable Diagnostic
Status: Bad
Action:
[Internet Access]
Make sure you properly activated the modem. If you activated the modem properly, contact your service provider for troubleshooting help.
Internet Access: Bad
Not able to access the internet. Issue might be due to incomplete activation.
Downstream Status: Good
Downstream Power Level: Good
Downstream SNR: Good
Upstream Status: Good
Upstream Power Level: Good
Current time: Sat Jan 11 09:14:06 2025
Startup Procedure
Acquire Downstream Channel: 495000000 Hz Locked
Connectivity State: Ok Operational
Boot State: Ok Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD honorMdd(4)
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM 256 13 453000000 Hz 6.1 38.6 1725 5688
2 Locked QAM 256 14 459000000 Hz 6.1 38.6 1526 1942
3 Locked QAM 256 15 465000000 Hz 6.0 38.9 1035 2226
4 Locked QAM 256 16 471000000 Hz 6.4 38.9 1134 2032
5 Locked QAM 256 17 477000000 Hz 6.5 38.9 929 1225
6 Locked QAM 256 18 483000000 Hz 6.5 38.9 1003 2093
7 Locked QAM 256 19 489000000 Hz 6.5 38.9 1018 1977
8 Locked QAM 256 20 495000000 Hz 6.1 38.9 34 32
9 Locked QAM 256 21 507000000 Hz 6.0 38.9 921 2706
10 Locked QAM 256 22 513000000 Hz 6.5 38.9 993 972
11 Locked QAM 256 23 519000000 Hz 6.5 37.6 955 929
12 Locked QAM 256 24 525000000 Hz 6.5 38.9 949 872
13 Locked QAM 256 25 531000000 Hz 6.4 38.9 953 1696
14 Locked QAM 256 26 537000000 Hz 6.0 38.6 957 1837
15 Locked QAM 256 27 543000000 Hz 6.3 38.6 897 713
16 Locked QAM 256 28 549000000 Hz 6.4 38.9 67 94
17 Locked QAM 256 29 555000000 Hz 6.8 38.9 840 726
18 Locked QAM 256 30 561000000 Hz 7.0 37.6 835 742
19 Locked QAM 256 31 567000000 Hz 7.0 36.6 858 1681
20 Locked QAM 256 32 573000000 Hz 7.0 36.6 950 599
21 Locked QAM 256 33 579000000 Hz 6.8 37.6 886 655
22 Locked QAM 256 34 585000000 Hz 6.8 38.6 983 526
23 Locked QAM 256 35 591000000 Hz 6.8 37.3 925 577
24 Locked QAM 256 36 597000000 Hz 6.9 35.5 1032 458
25 Locked QAM 256 37 603000000 Hz 6.5 37.6 864 579
26 Locked QAM 256 38 609000000 Hz 6.4 38.9 1046 379
27 Locked QAM 256 39 615000000 Hz 6.3 38.9 848 484
28 Locked QAM 256 40 621000000 Hz 6.0 38.6 845 430
29 Locked QAM 256 41 627000000 Hz 6.0 38.6 1030 324
30 Locked QAM 256 42 633000000 Hz 6.0 38.9 889 369
31 Locked QAM 256 43 639000000 Hz 6.0 38.6 857 332
32 Locked QAM 256 44 645000000 Hz 6.3 38.6 890 298
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 6 2560 10400000 Hz 40.3
2 Locked ATDMA 1 5120 16400000 Hz 40.5
3 Locked ATDMA 2 5120 22800000 Hz 41.3
4 Locked ATDMA 3 5120 29200000 Hz 41.3
5 Locked ATDMA 4 5120 35600000 Hz 43.0
6 Locked ATDMA 5 2560 40400000 Hz 43.5
7 Not Locked N/A 0 0 0 Hz 0.0
8 Not Locked N/A 0 0 0 Hz 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Not Locked 0 0 0 Hz 0.0 dBmV 0.0 dB 0~4095 0 0 0
2 Not Locked 0 0 0 Hz 0.0 dBmV 0.0 dB 0~4095 0 0 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0.0 dBmV
2 Not Locked 0 0 0 Hz 0.0 dBmV
Event Log
Time Priority Description
Jan 11 2025 01:18:36 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 01:18:50 Notice CM-STATUS message sent. Event Type Code: 4
Jan 11 2025 01:21:58 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 01:22:11 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 01:58:56 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 01:59:08 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 06:42:52 Critical No Ranging Response received - T3 time-out
Jan 11 2025 07:31:33 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 08:47:37 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Jan 11 2025 08:47:37 Notice TLV-11 - unrecognized OID
Jan 11 2025 08:47:41 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Jan 11 2025 08:47:41 Critical No Ranging Response received - T3 time-out
Jan 11 2025 08:48:06 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 08:48:08 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 08:48:44 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 08:48:53 Notice CM-STATUS message sent. Event Type Code: 2
Jan 11 2025 08:48:55 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Jan 11 2025 08:48:58 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 08:49:08 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Jan 11 2025 08:49:16 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 08:49:32 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 08:55:48 Critical No Ranging Response received - T3 time-out
Jan 11 2025 09:10:18 Notice CM-STATUS message sent. Event Type Code: 2
Jan 11 2025 09:10:20 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:10:26 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Jan 11 2025 09:10:29 Error TCS Fail on all Upstream Channels
Jan 11 2025 09:10:29 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:10:29 Notice CM-STATUS message sent. Event Type Code: 17
Jan 11 2025 09:10:32 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:10:33 Notice CM-STATUS message sent. Event Type Code: 2
Jan 11 2025 09:10:38 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Jan 11 2025 09:10:46 Notice CM-STATUS message sent. Event Type Code: 17
Jan 11 2025 09:10:49 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:10:54 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 09:11:00 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:11:02 Notice CM-STATUS message sent. Event Type Code: 17
Jan 11 2025 09:11:17 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:11:23 Notice CM-STATUS message sent. Event Type Code: 2
Jan 11 2025 09:11:37 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 09:11:47 Notice CM-STATUS message sent. Event Type Code: 5
---------------------------------------------------------------------------------------------------------------------------------------------------------
Status: Bad
Action:
[Internet Access]
Make sure you properly activated the modem. If you activated the modem properly, contact your service provider for troubleshooting help.
Internet Access: Bad
Not able to access the internet. Issue might be due to incomplete activation.
Downstream Status: Good
Downstream Power Level: Good
Downstream SNR: Good
Upstream Status: Good
Upstream Power Level: Good
Current time: Sat Jan 11 21:20:31 2025
Startup Procedure
Acquire Downstream Channel: 549000000 Hz Locked
Connectivity State: Ok Operational
Boot State: Ok Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD honorMdd(4)
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM 256 13 453000000 Hz 6.0 38.9 4339 19568
2 Locked QAM 256 14 459000000 Hz 5.9 38.6 4135 16990
3 Locked QAM 256 15 465000000 Hz 5.9 38.6 4136 21390
4 Locked QAM 256 16 471000000 Hz 6.0 38.6 3897 17925
5 Locked QAM 256 17 477000000 Hz 6.1 38.9 4132 15560
6 Locked QAM 256 18 483000000 Hz 6.3 38.9 4391 18023
7 Locked QAM 256 19 489000000 Hz 6.1 38.6 3576 10731
8 Locked QAM 256 20 495000000 Hz 5.8 38.9 2114 8302
9 Locked QAM 256 21 507000000 Hz 5.8 38.9 3227 11317
10 Locked QAM 256 22 513000000 Hz 6.0 38.6 3074 9170
11 Locked QAM 256 23 519000000 Hz 6.3 37.6 3212 9612
12 Locked QAM 256 24 525000000 Hz 6.3 38.6 3120 9464
13 Locked QAM 256 25 531000000 Hz 6.1 38.6 2897 5431
14 Locked QAM 256 26 537000000 Hz 5.6 38.9 2982 5999
15 Locked QAM 256 27 543000000 Hz 6.0 38.6 3115 6874
16 Locked QAM 256 28 549000000 Hz 6.0 38.9 81 44
17 Locked QAM 256 29 555000000 Hz 6.5 38.9 3186 6655
18 Locked QAM 256 30 561000000 Hz 6.8 37.3 2996 3769
19 Locked QAM 256 31 567000000 Hz 6.8 37.3 2837 5021
20 Locked QAM 256 32 573000000 Hz 6.8 37.6 2851 3746
21 Locked QAM 256 33 579000000 Hz 6.5 37.3 2470 2912
22 Locked QAM 256 34 585000000 Hz 6.5 38.9 2515 2859
23 Locked QAM 256 35 591000000 Hz 6.5 37.6 2697 3900
24 Locked QAM 256 36 597000000 Hz 6.5 36.6 169 57
25 Locked QAM 256 37 603000000 Hz 6.3 37.3 2876 3536
26 Locked QAM 256 38 609000000 Hz 6.1 38.9 2740 2438
27 Locked QAM 256 39 615000000 Hz 6.1 38.9 2832 3153
28 Locked QAM 256 40 621000000 Hz 5.8 38.9 2695 3178
29 Locked QAM 256 41 627000000 Hz 5.8 38.9 2666 2416
30 Locked QAM 256 42 633000000 Hz 5.6 38.9 2811 3201
31 Locked QAM 256 43 639000000 Hz 5.9 38.9 2621 2106
32 Locked QAM 256 44 645000000 Hz 6.1 38.9 2560 2761
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 6 2560 10400000 Hz 40.0
2 Locked ATDMA 1 5120 16400000 Hz 40.3
3 Locked ATDMA 2 5120 22800000 Hz 40.8
4 Locked ATDMA 3 5120 29200000 Hz 40.8
5 Locked ATDMA 4 5120 35600000 Hz 42.0
6 Locked ATDMA 5 2560 40400000 Hz 41.8
7 Not Locked N/A 0 0 0 Hz 0.0
8 Not Locked N/A 0 0 0 Hz 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Not Locked 0 0 0 Hz 0.0 dBmV 0.0 dB 0~4095 0 0 0
2 Not Locked 0 0 0 Hz 0.0 dBmV 0.0 dB 0~4095 0 0 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0.0 dBmV
2 Not Locked 0 0 0 Hz 0.0 dBmV
Event Log
Time Priority Description
Jan 11 2025 17:38:12 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 17:47:51 Error DBC-ACK not received
Jan 11 2025 18:01:05 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:01:08 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:05:25 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:05:27 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:24:37 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:25:04 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:34:03 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:34:20 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:37:00 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:37:12 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:39:06 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:39:11 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:39:26 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 18:39:32 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 18:54:55 Critical No Ranging Response received - T3 time-out
Jan 11 2025 19:10:08 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 19:10:46 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 19:11:39 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 19:11:40 Notice CM-STATUS message sent. Event Type Code: 2
Jan 11 2025 19:15:51 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 19:16:08 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 19:33:42 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 19:33:42 Warning Lost MDD Timeout
Jan 11 2025 19:33:50 Error TCS Fail on all Upstream Channels
Jan 11 2025 19:33:50 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 19:33:54 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 19:41:34 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 19:41:36 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 20:17:59 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 20:18:04 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 20:32:44 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 20:32:53 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 20:43:45 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 20:43:46 Notice CM-STATUS message sent. Event Type Code: 5
Jan 11 2025 21:09:51 Critical No Ranging Response received - T3 time-out
Jan 11 2025 21:18:31 Notice CM-STATUS message sent. Event Type Code: 2
Jan 11 2025 21:18:31 Critical SYNC Timing Synchronization failure - Loss of Sync
Jan 11 2025 21:18:54 Notice CM-STATUS message sent. Event Type Code: 5
XfinityRay
Official Employee
•
2.4K Messages
20 hours ago
Hi there, quicksoccer! We are happy to look further into this so you can use your service as intended. We don't want any problems happening with the service!
Please send us a direct message with your full name and complete service address to “Xfinity Support”. To do so, click on the direct messaging icon located at the top right of this forums page.
Here's the detailed steps to direct message us:
• Click "Sign In" if necessary
• Click the "Direct Message” icon (upper right corner of this page)
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
• Type your message in the text area near the bottom of the window
• Press Enter to send your message
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EG
Expert
•
108K Messages
6 hours ago
@quicksoccer @XfinityRay
Please circle back here and post any possible solutions for the issue here in these open public forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.
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