Regular Visitor
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3 Messages
Regular Internet Disconnects
Hello, I've been fighting with internet connection drops every day or two on a regular basis for a while now. The only way to get it back up is to restart the modem. Would love some help troubleshooting, if possible.
Basics:
- Motorola SB8600 3.1
- Gigabit plan
- No splitters at all between line into house and modem
Downstream
| Channel | Lock Status | Modulation | Channel ID | Freq. (MHz) | Pwr (dBmV) | SNR (dB) | Corrected | Uncorrected |
| 1 | Locked | QAM256 | 41 | 645.0 | 4.5 | 41.2 | 0 | 0 |
| 2 | Locked | QAM256 | 13 | 471.0 | 2.8 | 42.1 | 0 | 0 |
| 3 | Locked | QAM256 | 14 | 477.0 | 2.9 | 42.0 | 0 | 0 |
| 4 | Locked | QAM256 | 15 | 483.0 | 3.0 | 42.0 | 0 | 0 |
| 5 | Locked | QAM256 | 16 | 489.0 | 3.0 | 42.0 | 0 | 0 |
| 6 | Locked | QAM256 | 17 | 495.0 | 2.9 | 41.9 | 0 | 0 |
| 7 | Locked | QAM256 | 18 | 507.0 | 2.8 | 41.9 | 0 | 0 |
| 8 | Locked | QAM256 | 19 | 513.0 | 2.7 | 41.8 | 0 | 0 |
| 9 | Locked | QAM256 | 20 | 519.0 | 2.5 | 41.7 | 0 | 0 |
| 10 | Locked | QAM256 | 21 | 525.0 | 2.6 | 41.7 | 0 | 0 |
| 11 | Locked | QAM256 | 22 | 531.0 | 2.7 | 41.8 | 0 | 0 |
| 12 | Locked | QAM256 | 23 | 537.0 | 2.8 | 41.6 | 0 | 0 |
| 13 | Locked | QAM256 | 24 | 543.0 | 2.7 | 41.5 | 0 | 0 |
| 14 | Locked | QAM256 | 25 | 549.0 | 2.8 | 41.5 | 0 | 0 |
| 15 | Locked | QAM256 | 26 | 555.0 | 2.8 | 41.4 | 0 | 0 |
| 16 | Locked | QAM256 | 27 | 561.0 | 3.0 | 41.5 | 0 | 0 |
| 17 | Locked | QAM256 | 28 | 567.0 | 3.4 | 41.5 | 0 | 0 |
| 18 | Locked | QAM256 | 29 | 573.0 | 3.6 | 41.7 | 0 | 0 |
| 19 | Locked | QAM256 | 30 | 579.0 | 3.8 | 41.6 | 0 | 0 |
| 20 | Locked | QAM256 | 31 | 585.0 | 3.8 | 41.6 | 0 | 0 |
| 21 | Locked | QAM256 | 32 | 591.0 | 3.9 | 41.5 | 0 | 0 |
| 22 | Locked | QAM256 | 33 | 597.0 | 4.2 | 41.4 | 0 | 0 |
| 23 | Locked | QAM256 | 34 | 603.0 | 4.1 | 41.5 | 0 | 0 |
| 24 | Locked | QAM256 | 35 | 609.0 | 4.1 | 41.3 | 0 | 0 |
| 25 | Locked | QAM256 | 36 | 615.0 | 4.4 | 41.3 | 0 | 0 |
| 26 | Locked | QAM256 | 37 | 621.0 | 4.6 | 41.4 | 0 | 0 |
| 27 | Locked | QAM256 | 38 | 627.0 | 4.5 | 41.4 | 0 | 0 |
| 28 | Locked | QAM256 | 39 | 633.0 | 4.5 | 41.3 | 0 | 0 |
| 29 | Locked | QAM256 | 40 | 639.0 | 4.5 | 41.2 | 0 | 0 |
| 30 | Locked | QAM256 | 42 | 651.0 | 4.5 | 41.2 | 0 | 0 |
| 31 | Locked | QAM256 | 43 | 657.0 | 4.3 | 41.1 | 0 | 0 |
| 32 | Locked | QAM256 | 44 | 663.0 | 3.9 | 41.0 | 0 | 0 |
| 33 | Locked | OFDM PLC | 159 | 690.0 | 3.6 | 41.2 | 152243 | 0 |
Upstream
| Channel | Lock Status | Channel Type | Channel ID | Symb. Rate (Ksym/sec) | Freq. (MHz) | Pwr (dBmV) |
| 1 | Locked | SC-QAM | 1 | 5120 | 18.0 | 39.5 |
| 2 | Locked | SC-QAM | 2 | 5120 | 24.4 | 40.0 |
| 3 | Locked | SC-QAM | 3 | 5120 | 30.8 | 40.5 |
| 4 | Locked | SC-QAM | 4 | 5120 | 37.2 | 40.5 |
| 5 | Locked | SC-QAM | 5 | 1280 | 41.2 | 37.5 |
Events
| Time | Priority | Description | |||
| 03:12:42 Wed Nov 18 2020 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 03:13:01 Wed Nov 18 2020 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 03:13:01 Wed Nov 18 2020 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 03:13:21 Wed Nov 18 2020 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 03:13:21 Wed Nov 18 2020 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 03:13:41 Wed Nov 18 2020 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 03:13:41 Wed Nov 18 2020 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| 17:23:50 Tue Dec 1 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; | |||
| Time Not Established | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 | |||
| 07:54:23 Sat Dec 12 2020 | Warning (5) | REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 07:54:23 Sat Dec 12 2020 | Warning (5) | RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:50:7b;CMTS-MAC=58:97:bd:98:9e:43;CM-QOS=1.1;CM-VER=3.1; | |||
| 07:54:23 Sat Dec 12 2020 | Warning (5) | Dynamic Range Window violation | |||
If anyone has any suggestions on things to try or look at closer, I would appreciate it!
EG
Expert
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103.5K Messages
3 years ago
Is this with a router in the mix / WiFi connection ? If so, for a test, does a computer hardwired directly to the MB8600 have the same problem ?
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EG
Expert
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103.5K Messages
3 years ago
Yes. Your signal stats are good ! The error logs, not so good. I'm just trying to narrow things down. With this test, we are trying to isolate this from being either a WiFi / router-only problem or a problem with the general connection to the Comcast system which would of course affect both. It's a first step of their troubleshooting S.O.P. before I can escalate it up the ladder to Comcast employees here.
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wiley2
Regular Visitor
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3 Messages
3 years ago
The setup is a single coax coming into the house with no splitter going into the MB8600. From there, it goes straight into a Google Wifi Mesh router puck. From the puck, it goes straight to an TP-Link 8-port switch.
I can possibly try the test of going straight to a computer, but I'm not sure when it'll happen next - which makes it challenging.
Any other suggestions? Do the numbers in the output I supplied look appropriate? Concerns with the events in the log?
Thanks in advance!
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