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New Contributor
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Upload power levels jumping and modem resets
This is the current power levels for upload channels
| Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power |
| 1 | Locked | ATDMA | 4 | 5120 Ksym/sec | 36300000 Hz | 42.7 dBmV |
| 2 | Locked | TDMA and ATDMA | 1 | 2560 Ksym/sec | 18400000 Hz | 44.2 dBmV |
| 3 | Locked | ATDMA | 2 | 5120 Ksym/sec | 23300000 Hz | 40.7 dBmV |
| 4 | Locked | ATDMA | 3 | 5120 Ksym/sec | 29800000 Hz | 45.2 dBmV |
Periodically it jumps to >54dMv and I get an error from the modem that's this
| Time | Priority | Description |
|---|---|---|
| Tue Nov 15 15:15:53 2016 | Warning (5) | Dynamic Range Window violation |
This has been happening alot now and it's quite frustrating. Any help will be appreciated. We plug the modem directly to the line on the wall with a cable and don't have any splitters in between.
Update: Contacted support via chat and they said there were too many power adjustments being done by the modem and they think the fault is the modem. Also here's the info I have right now on the downstream channels:
| Downstream Bonded Channels | ||||||||
|---|---|---|---|---|---|---|---|---|
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Corrected | Uncorrectables |
| 1 | Locked | QAM256 | 62 | 975000000 Hz | 2.7 dBmV | 38.2 dB | 32 | 0 |
| 2 | Locked | QAM256 | 57 | 945000000 Hz | 2.7 dBmV | 38.2 dB | 0 | 0 |
| 3 | Locked | QAM256 | 58 | 951000000 Hz | 2.5 dBmV | 38.2 dB | 0 | 0 |
| 4 | Locked | QAM256 | 59 | 957000000 Hz | 3.2 dBmV | 38.6 dB | 1 | 0 |
| 5 | Locked | QAM256 | 60 | 963000000 Hz | 2.8 dBmV | 38.2 dB | 4 | 0 |
| 6 | Locked | QAM256 | 61 | 969000000 Hz | 3.0 dBmV | 38.3 dB | 23 | 0 |
| 7 | Locked | QAM256 | 63 | 981000000 Hz | 2.0 dBmV | 37.9 dB | 30 | 0 |
| 8 | Locked | QAM256 | 64 | 987000000 Hz | 1.9 dBmV | 37.8 dB | 86 | 400 |
grymwulf
Contributor II
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Dynamic Range Window violation really are indications that your transmit levels change in levels over 12dBmV between extremes.
This usually is caused by several possibilities:
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chinmaya
New Contributor
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So got a replacement modem and I'm still having T3 timeouts and high upload power levels. Internet resets atleast 3 times a day and I'm getting more frustrated with the service so much so that I'm considering finding another isp at this point.
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grymwulf
Contributor II
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At that point it does look like the other causes (not the modem) would be likely to be the issue. Have you called phone support to get a technician out?
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cpljp
Contributor
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Power adjustments and T3 timeouts, in my experience, is a result of either noise, micro reflections caused by an impedance in the line, or an impedance in general. The modem keeps having to adjust its power to overcome said impedance. I'd recommend scheduling a tech visit at this point
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