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WAN Error, UCD invalid or channel unusable and Sync timing failure
Woke up yesterday morning to find out my internet was out, did all the usual troubleshooting steps (restart everything, check cables, even reset my router). Looking deeper into the router and modem event logs, noticed my router was not renewing its IP and the modem had several errors (posted below). I plugged my modem directly into my computer and it works just fine but for some reason not playing nice with my router and grabbing an IP. I have a Netgear R7000 router and a Arris SB8200 modem. Have xfinity and the same equipment set up for the last 3 months with no issues so this is a bit weird, any help is appreciated.
| Date Time | Event ID | Event Level | Description |
| 6/23/2023 05:13 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 6/23/2023 05:13 | 67061600 | 6 | "DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 2436694066 | 6 | "Honoring MDD; IP provisioning mode = IPv6" |
| 1/1/1970 00:00 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 6/22/2023 20:59 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 6/22/2023 20:58 | 2436694044 | 3 | "Resetting the cable modem due to docsDevResetNow" |
| 6/22/2023 20:34 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 6/22/2023 20:33 | 2436694044 | 3 | "Resetting the cable modem due to docsDevResetNow" |
| 6/22/2023 16:53 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 6/22/2023 16:51 | 2436694044 | 3 | "Resetting the cable modem due to docsDevResetNow" |
| 6/22/2023 05:42 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 6/22/2023 05:40 | 2436694044 | 3 | "Resetting the cable modem due to docsDevResetNow" |
| 6/22/2023 05:13 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 85000200 | 3 | "UCD invalid or channel unusable;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1;" |
| 1/1/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| downstream | |||||||
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 20 | Locked | QAM256 | 567000000 Hz | 7.9 dBmV | 44.8 dB | 0 | 0 |
| 13 | Locked | QAM256 | 525000000 Hz | 8.0 dBmV | 45.1 dB | 0 | 0 |
| 14 | Locked | QAM256 | 531000000 Hz | 8.0 dBmV | 45.1 dB | 0 | 0 |
| 15 | Locked | QAM256 | 537000000 Hz | 7.9 dBmV | 45.1 dB | 0 | 0 |
| 16 | Locked | QAM256 | 543000000 Hz | 7.9 dBmV | 44.9 dB | 0 | 0 |
| 17 | Locked | QAM256 | 549000000 Hz | 7.8 dBmV | 44.9 dB | 0 | 0 |
| 18 | Locked | QAM256 | 555000000 Hz | 7.8 dBmV | 44.7 dB | 0 | 0 |
| 19 | Locked | QAM256 | 561000000 Hz | 7.9 dBmV | 44.7 dB | 0 | 0 |
| 21 | Locked | QAM256 | 573000000 Hz | 8.0 dBmV | 44.7 dB | 0 | 0 |
| 22 | Locked | QAM256 | 579000000 Hz | 8.0 dBmV | 44.7 dB | 0 | 0 |
| 23 | Locked | QAM256 | 585000000 Hz | 7.9 dBmV | 44.8 dB | 0 | 0 |
| 24 | Locked | QAM256 | 591000000 Hz | 7.9 dBmV | 44.6 dB | 0 | 0 |
| 25 | Locked | QAM256 | 597000000 Hz | 7.8 dBmV | 44.7 dB | 0 | 0 |
| 26 | Locked | QAM256 | 603000000 Hz | 7.8 dBmV | 44.6 dB | 0 | 0 |
| 27 | Locked | QAM256 | 609000000 Hz | 7.8 dBmV | 44.6 dB | 0 | 0 |
| 28 | Locked | QAM256 | 615000000 Hz | 7.8 dBmV | 44.6 dB | 0 | 0 |
| 29 | Locked | QAM256 | 621000000 Hz | 7.8 dBmV | 44.5 dB | 0 | 0 |
| 30 | Locked | QAM256 | 627000000 Hz | 7.8 dBmV | 44.6 dB | 0 | 0 |
| 31 | Locked | QAM256 | 633000000 Hz | 8.1 dBmV | 44.7 dB | 0 | 0 |
| 32 | Locked | QAM256 | 639000000 Hz | 8.1 dBmV | 44.5 dB | 0 | 0 |
| 33 | Locked | QAM256 | 645000000 Hz | 8.0 dBmV | 44.5 dB | 0 | 0 |
| 34 | Locked | QAM256 | 651000000 Hz | 8.0 dBmV | 44.4 dB | 0 | 0 |
| 35 | Locked | QAM256 | 657000000 Hz | 8.2 dBmV | 44.5 dB | 0 | 0 |
| 36 | Locked | QAM256 | 663000000 Hz | 8.2 dBmV | 44.4 dB | 0 | 0 |
| 37 | Locked | QAM256 | 669000000 Hz | 8.1 dBmV | 44.5 dB | 0 | 0 |
| 38 | Locked | QAM256 | 675000000 Hz | 7.9 dBmV | 43.5 dB | 0 | 0 |
| 39 | Locked | QAM256 | 681000000 Hz | 7.8 dBmV | 44.2 dB | 0 | 0 |
| 40 | Locked | QAM256 | 687000000 Hz | 7.8 dBmV | 44.2 dB | 0 | 0 |
| 41 | Locked | QAM256 | 693000000 Hz | 7.7 dBmV | 44.1 dB | 0 | 0 |
| 42 | Locked | QAM256 | 699000000 Hz | 7.6 dBmV | 43.9 dB | 0 | 0 |
| 43 | Locked | QAM256 | 705000000 Hz | 7.4 dBmV | 43.9 dB | 0 | 0 |
| 44 | Locked | QAM256 | 711000000 Hz | 7.5 dBmV | 43.9 dB | 0 | 0 |
| 193 | Locked | Other | 957000000 Hz | 4.7 dBmV | 39.2 dB | 262722826 | 0 |
| upstream | ||||||
| Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
| 1 | 17 | Locked | SC-QAM Upstream | 35600000 Hz | 6400000 Hz | 40.0 dBmV |
| 2 | 18 | Locked | SC-QAM Upstream | 29200000 Hz | 6400000 Hz | 40.0 dBmV |
| 3 | 19 | Locked | SC-QAM Upstream | 22800000 Hz | 6400000 Hz | 40.0 dBmV |
| 4 | 20 | Locked | SC-QAM Upstream | 16400000 Hz | 6400000 Hz | 40.0 dBmV |
XfinityEva
Official Employee
•
2.3K Messages
3 years ago
Hi @user_f9b0b0! I see there was an interruption in the area, that has since resolved. Are you still experiencing issues with your services?
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himynameisben
8 Messages
3 years ago
I am experiencing this same issue with essentially the same logs. I have the Netgear CM1100 modem, though. These Critical errors appears anytime the modem is rebooted. Sometimes the rebooting is done on intentionally, other times it's happened unprompted. Either way, the critical error appears.
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