1 Message
SYNC Timing Synchronization Failure
As you may expect my Xfinity connection is frequently dropping throughout the day because of this issue. It's been happening since August and just recently Xfinity buried a new cable, replaced an amplifier, and tested all levels to spec. It was solid for a week but the SYNC issues continue. I went as far as replacing the modem originally a Motorola to an Arris but the issue persists. The Sync error is leaving the modem completely unreachable. Even from within my own network, I can't ping it, log in, or anything. It never receives a request to reboot. It has to be manually unplugged every time it crashes. Below is the log and the power levels.
31/12/1969 19:00:20 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz. |
31/12/1969 19:00:25 |
3 |
No Ranging Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
31/12/1969 19:00:40 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz. |
31/12/1969 19:00:40 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz. |
31/12/1969 19:00:40 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz. |
31/12/1969 19:00:16 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz. |
31/12/1969 19:00:19 |
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; |
31/12/1969 19:00:21 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz. |
31/12/1969 19:00:25 |
3 |
No Ranging Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
31/12/1969 19:00:38 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz. |
31/12/1969 19:00:38 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz. |
31/12/1969 19:00:38 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz. |
31/12/1969 19:00:15 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz. |
31/12/1969 19:00:19 |
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; |
31/12/1969 19:00:20 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz. |
31/12/1969 19:00:23 |
3 |
No Ranging Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
31/12/1969 19:00:36 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz. |
31/12/1969 19:00:36 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz. |
31/12/1969 19:00:36 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz. |
16/10/2024 11:37:29 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:37:35 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:16 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:17 |
3 |
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:17 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:18 |
3 |
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:18 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:18 |
3 |
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:21 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:39:21 |
3 |
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 11:40:04 |
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; |
16/10/2024 11:40:07 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz. |
16/10/2024 11:40:21 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz. |
16/10/2024 11:40:21 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz. |
16/10/2024 11:40:21 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz. |
31/12/1969 19:00:16 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz. |
31/12/1969 19:00:20 |
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; |
31/12/1969 19:00:22 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz. |
31/12/1969 19:00:25 |
3 |
No Ranging Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
31/12/1969 19:00:41 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz. |
31/12/1969 19:00:41 |
3 |
CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz. |
31/12/1969 19:00:41 |
3 |
CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz. |
16/10/2024 14:11:01 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 14:11:05 |
3 |
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
16/10/2024 14:13:37 |
3 |
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=xx;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.1; |
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 17 | Locked | QAM256 | 519000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 1 | Locked | QAM256 | 417000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 2 | Locked | QAM256 | 423000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 3 | Locked | QAM256 | 429000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 4 | Locked | QAM256 | 435000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 5 | Locked | QAM256 | 441000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 6 | Locked | QAM256 | 447000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 7 | Locked | QAM256 | 453000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 8 | Locked | QAM256 | 459000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 9 | Locked | QAM256 | 465000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 10 | Locked | QAM256 | 471000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 11 | Locked | QAM256 | 477000000 Hz | 5 dBmV | 41 dB | 0 | 0 |
| 12 | Locked | QAM256 | 483000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 13 | Locked | QAM256 | 489000000 Hz | 5 dBmV | 42 dB | 0 | 0 |
| 14 | Locked | QAM256 | 495000000 Hz | 5 dBmV | 41 dB | 0 | 0 |
| 15 | Locked | QAM256 | 507000000 Hz | 5 dBmV | 41 dB | 0 | 0 |
| 16 | Locked | QAM256 | 513000000 Hz | 5 dBmV | 41 dB | 0 | 0 |
| 18 | Locked | QAM256 | 525000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 19 | Locked | QAM256 | 531000000 Hz | 5 dBmV | 41 dB | 0 | 0 |
| 20 | Locked | QAM256 | 537000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 21 | Locked | QAM256 | 543000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 22 | Locked | QAM256 | 549000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 23 | Locked | QAM256 | 561000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 24 | Locked | QAM256 | 567000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 25 | Locked | OFDM PLC | 693000000 Hz | 5 dBmV | 40 dB | 20207399 | 0 |
| 26 | Locked | QAM256 | 573000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 27 | Locked | QAM256 | 579000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 28 | Locked | QAM256 | 585000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 29 | Locked | QAM256 | 591000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 30 | Locked | QAM256 | 597000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| 31 | Locked | QAM256 | 603000000 Hz | 5 dBmV | 41 dB | 0 | 0 |
| 32 | Locked | QAM256 | 609000000 Hz | 4 dBmV | 41 dB | 0 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel ID | Lock Status | US Channel Type | Frequency | Width | Power | |
| 6 | Locked | SC-QAM | 16300000 Hz | 6400000 | 46.5 dBmV | |
| 7 | Locked | SC-QAM | 22800000 Hz | 6400000 | 46.5 dBmV | |
| 8 | Locked | SC-QAM | 29200000 Hz | 6400000 | 45.8 dBmV | |
| 11 | Locked | SC-QAM | 35600000 Hz | 6400000 | 45.0 dBmV | |
| 12 | Locked | SC-QAM | 40400000 Hz | 3200000 | 44.5 dBmV | |
XfinityJorge
Official Employee
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1.7K Messages
1 month ago
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EG
Expert
•
107.1K Messages
1 month ago
@XfinityJorge
Why does this have to go private at this point ? That kind of defeats the purpose of a public help forum such as this is, no ?... Why not ask some general self troubleshooting things first which is in keeping with the intent of what these public help forums were designed for so that all readers here may benefit.
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