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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 |
Accepted Solution
EG
Expert
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110.3K Messages
4 years ago
The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. The downstream power is a bit low / weak as well. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.
Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
Good luck with it !
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