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user_eey3jo
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Thursday, March 26th, 2026 5:26 PM

Uncorrected Errors, Especially on one channel

I recently had tons of uncorrected errors, and very high upstream power levels (50+ dBmV). I found a bad splitter and replaced it, which dropped the upstream power to 40 dBmV and got rid of most of the uncorrected errors. But I'm still seeing some, and not sure where to continue chasing this down.

Here's what my modem says for connection stats:

Acquire Downstream Channel 531000000 Hz Locked
   Upstream Connection OK Operational
   Boot State OK Operational
   Configuration File OK
   Security Enabled BPI+


   Connection Status
   System Up Time 2 days 18h:01m:22s
   Network Access Allowed


   Downstream Bonded Channels
   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 20 531.0 2.1 42.6 321 1
   2 Locked QAM256 13 489.0 2.3 43.4 1035 204
   3 Locked QAM256 14 495.0 2.3 43.6 420 99
   4 Locked QAM256 15 501.0 2.2 43.6 821 56
   5 Locked QAM256 16 507.0 2.1 43.5 282 0
   6 Locked QAM256 17 513.0 1.9 43.4 597 21
   7 Locked QAM256 18 519.0 1.9 43.5 444 24
   8 Locked QAM256 19 525.0 1.9 43.2 668 55
   9 Locked QAM256 21 537.0 2.4 43.0 632 9
   10 Locked QAM256 22 543.0 2.3 43.5 316 26
   11 Locked QAM256 23 549.0 2.3 43.6 482 8
   12 Locked QAM256 24 555.0 2.0 43.5 287 0
   13 Locked QAM256 25 561.0 2.0 43.5 376 0
   14 Locked QAM256 26 567.0 1.6 41.9 243 1
   15 Locked QAM256 27 573.0 1.6 42.3 492 9
   16 Locked QAM256 28 579.0 1.5 43.0 256 0
   17 Locked QAM256 29 585.0 1.5 38.8 397 6
   18 Locked QAM256 30 591.0 1.5 41.3 284 0
   19 Locked QAM256 31 597.0 1.7 42.4 375 0
   20 Locked QAM256 32 603.0 1.5 40.1 246 0
   21 Locked QAM256 33 609.0 1.2 41.7 284 0
   22 Locked QAM256 34 615.0 0.7 39.6 247 0
   23 Locked QAM256 35 621.0 0.8 32.8 869 0
   24 Locked QAM256 36 627.0 0.6 30.7 1667992 147733
   25 Locked QAM256 37 633.0 0.7 34.6 240 0
   26 Locked QAM256 38 639.0 0.5 37.7 215 0
   27 Locked QAM256 39 645.0 0.7 42.6 364 0
   28 Locked QAM256 40 651.0 0.9 42.8 200 0
   29 Locked QAM256 41 657.0 1.0 42.9 266 0
   30 Locked QAM256 42 663.0 0.9 42.9 562 111
   31 Locked QAM256 43 669.0 0.7 42.7 6464 19329
   32 Locked QAM256 44 675.0 0.2 41.9 1886 3630
   33 Locked OFDM PLC 193 957.0 -7.4 37.9 -2132881031 11094


   Upstream Bonded Channels
   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 17 5120 16.4 42.0
   2 Locked SC-QAM 18 5120 22.8 42.0
   3 Locked SC-QAM 19 5120 29.2 42.0
   4 Locked SC-QAM 20 5120 35.6 42.3

So my questions:

  1. Upstream channels look good now, right?
  2. Downstream channel 24 has poor SNR and lots of errors, what to look into that would cause just one channel to be bad?
  3. Downstream channel 31 has good SNR and power but still accumulating errors, what to look into for that?
  4. Should I worry about the other downstream channels that are only accumulating ones or tens of uncorrected errors per day? I'm not sure why channels with seemingly good SNR and power would be accumulating errors at all.

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16 hours ago

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user_eey3jo

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20 hours ago

I'm also still seeing a few critical error logs in the modem per day, though that is down from many per day before I replaced the bad splitter. Specifically I'm seeing 1-2 "Started Unicast Maintenance Ranging - No Response received - T3 time-out" and 1-2 "UCD invalid or channel unusable" per day, and more rarely some warnings like "RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW" and "Dynamic Range Window violation".

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