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DOCSIS3.0 works fine , 3.1 keeps droping
Xfinity replaced defective lines at my house and checked all connections and signal levels internally. This issue started about 3 weeks ago. Rebooting the modem will reconnect 3.1 and it stays for hours. No errors are reported on the 3.0 channels, and this particular modem always reports errors (the case since day one last year) but up to now had no 3.1 issues. Modem is an Arris SB8200. Details follow in the rest of this message. Channel ID 25 is the OFDM 3.1 channel (told to me by Arris who reviewed this information).
| tandard Specification Compliant | Docsis 3.1 |
| Hardware Version | 6 |
| Software Version | AB01.02.053.05_051921_193.0A.NSH |
| Procedure | Status | Comment |
| Acquire Downstream Channel | 519000000 Hz | Locked |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Configuration File | OK | |
| Security | Enabled | BPI+ |
| DOCSIS Network Access Enabled | Allowed |
| Downstream Bonded Channels | |||||||
|---|---|---|---|---|---|---|---|
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 13 | Locked | QAM256 | 519000000 Hz | -4.3 dBmV | 42.3 dB | 0 | 0 |
| 1 | Locked | QAM256 | 441000000 Hz | -4.3 dBmV | 42.2 dB | 17 | 0 |
| 2 | Locked | QAM256 | 453000000 Hz | -4.6 dBmV | 42.0 dB | 33 | 0 |
| 3 | Locked | QAM256 | 459000000 Hz | -4.6 dBmV | 42.1 dB | 24 | 0 |
| 4 | Locked | QAM256 | 465000000 Hz | -4.4 dBmV | 42.1 dB | 32 | 0 |
| 5 | Locked | QAM256 | 471000000 Hz | -4.5 dBmV | 42.1 dB | 28 | 0 |
| 6 | Locked | QAM256 | 477000000 Hz | -4.6 dBmV | 42.0 dB | 2 | 0 |
| 7 | Locked | QAM256 | 483000000 Hz | -4.3 dBmV | 42.3 dB | 8 | 0 |
| 8 | Locked | QAM256 | 489000000 Hz | -4.3 dBmV | 42.2 dB | 32 | 0 |
| 9 | Locked | QAM256 | 495000000 Hz | -4.1 dBmV | 42.4 dB | 27 | 0 |
| 10 | Locked | QAM256 | 501000000 Hz | -4.3 dBmV | 42.2 dB | 41 | 1 |
| 11 | Locked | QAM256 | 507000000 Hz | -4.1 dBmV | 42.3 dB | 26 | 0 |
| 12 | Locked | QAM256 | 513000000 Hz | -4.0 dBmV | 42.2 dB | 32 | 1 |
| 14 | Locked | QAM256 | 525000000 Hz | -4.6 dBmV | 42.1 dB | 0 | 0 |
| 15 | Locked | QAM256 | 531000000 Hz | -4.5 dBmV | 42.2 dB | 26 | 0 |
| 16 | Locked | QAM256 | 537000000 Hz | -4.7 dBmV | 42.0 dB | 0 | 0 |
| 17 | Locked | QAM256 | 543000000 Hz | -4.7 dBmV | 42.0 dB | 10 | 0 |
| 18 | Locked | QAM256 | 555000000 Hz | -4.8 dBmV | 41.8 dB | 33 | 0 |
| 19 | Locked | QAM256 | 561000000 Hz | -4.7 dBmV | 42.0 dB | 12 | 0 |
| 20 | Locked | QAM256 | 567000000 Hz | -4.9 dBmV | 41.9 dB | 9 | 0 |
| 21 | Locked | QAM256 | 573000000 Hz | -4.8 dBmV | 41.9 dB | 1 | 0 |
| 22 | Locked | QAM256 | 579000000 Hz | -5.0 dBmV | 41.8 dB | 5 | 0 |
| 23 | Locked | QAM256 | 585000000 Hz | -5.0 dBmV | 41.8 dB | 34 | 0 |
| 24 | Locked | QAM256 | 591000000 Hz | -4.8 dBmV | 41.8 dB | 17 | 0 |
| 25 | Locked | Other | 693000000 Hz | -4.9 dBmV | 40.0 dB | 918465283 | 0 |
| 26 | Not Locked | QAM256 | 0 Hz | 0.0 dBmV | 42.1 dB | 0 | 0 |
| 27 | Locked | QAM256 | 597000000 Hz | -4.5 dBmV | 42.0 dB | 14 | 0 |
| 28 | Locked | QAM256 | 603000000 Hz | -4.4 dBmV | 42.0 dB | 0 | 0 |
| 29 | Locked | QAM256 | 609000000 Hz | -4.5 dBmV | 41.8 dB | 0 | 0 |
| 30 | Locked | QAM256 | 615000000 Hz | -4.9 dBmV | 41.7 dB | 1 | 0 |
| 31 | Locked | QAM256 | 621000000 Hz | -5.0 dBmV | 41.6 dB | 12 | 0 |
| 32 | Locked | QAM256 | 627000000 Hz | -5.0 dBmV | 41.9 dB | 0 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
| 1 | 9 | Locked | SC-QAM Upstream | 36500000 Hz | 6400000 Hz | 50.0 dBmV |
| 2 | 10 | Locked | SC-QAM Upstream | 30100000 Hz | 6400000 Hz | 50.0 dBmV |
| 3 | 11 | Locked | SC-QAM Upstream | 23700000 Hz | 6400000 Hz | 49.0 dBmV |
| 4 | 12 | Locked | SC-QAM Upstream | 17300000 Hz | 6400000 Hz | 49.0 dBmV |
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