Like most I’m on Xfinity with my own S33 modem. I updated my service to an 800Mbps/100Mbps plan and haven’t been able to get anywhere higher than 11.8Mbps uploads on the Xfinity speedtest site. A tech came out and ran a new line today and we removed a splitter that was no longer needed and he said the signal levels were much improved. The only thing I’ve seen improve so far is the number of correctable and uncorrectable errors on channel 1 have gone away with the new line. Otherwise, the power levels on the upstream connection actually seem to have dropped (maybe that’s ok) from 47.5 dBmV to 43.0 dBmV. I’m still not getting any higher than the 11.8Mbps even though I’d expect to at least hit 20Mbps if they still haven’t opened up support to 100Mbps to the S33.
Here are the levels from the modem status page after the new line was installed (and splitter removed). Does anything stand out as a problem? Xfinity support replied that they’re showing downstream SNR is at 44.5 and your upstream SNR is 40.6 and everything within spec on their end.
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 4 | Locked | QAM256 | 453000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 1 | Locked | QAM256 | 435000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 2 | Locked | QAM256 | 441000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 3 | Locked | QAM256 | 447000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 5 | Locked | QAM256 | 459000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 6 | Locked | QAM256 | 465000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 7 | Locked | QAM256 | 471000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 8 | Locked | QAM256 | 477000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 9 | Locked | QAM256 | 483000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 10 | Locked | QAM256 | 489000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 11 | Locked | QAM256 | 495000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 12 | Locked | QAM256 | 501000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 13 | Locked | QAM256 | 507000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 14 | Locked | QAM256 | 513000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 15 | Locked | QAM256 | 519000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 16 | Locked | QAM256 | 525000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 17 | Locked | QAM256 | 531000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 18 | Locked | QAM256 | 537000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 19 | Locked | QAM256 | 543000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 20 | Locked | QAM256 | 549000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 21 | Locked | QAM256 | 555000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 22 | Locked | QAM256 | 561000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 23 | Locked | QAM256 | 567000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 24 | Locked | QAM256 | 573000000 Hz | -1 dBmV | 44 dB | 0 | 0 |
| 25 | Locked | QAM256 | 579000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 26 | Locked | QAM256 | 585000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 27 | Locked | QAM256 | 591000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 28 | Locked | QAM256 | 597000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 29 | Locked | QAM256 | 603000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 30 | Locked | QAM256 | 609000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 31 | Locked | QAM256 | 615000000 Hz | 0 dBmV | 43 dB | 0 | 0 |
| 32 | Locked | QAM256 | 621000000 Hz | 0 dBmV | 44 dB | 0 | 0 |
| 193 | Locked | OFDM PLC | 957000000 Hz | -1 dBmV | 42 dB | 2861410 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel ID | Lock Status | US Channel Type | Frequency | Width | Power | |
| 1 | Locked | SC-QAM | 16400000 Hz | 6400000 | 43.0 dBmV | |
| 2 | Locked | SC-QAM | 22800000 Hz | 6400000 | 43.5 dBmV | |
| 3 | Locked | SC-QAM | 29200000 Hz | 6400000 | 43.5 dBmV | |
| 4 | Locked | SC-QAM | 35600000 Hz | 6400000 | 43.8 dBmV | |
Best answer by SURFboard Moderator
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