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DLabit29
+3 more
Contributor
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Docsis 3.1 question
Why is only 1 docsis 3.1 channel in use and why does it almost always have uncorrectables?
Bruce
+4 more
Honored Contributor III
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Could you post a copy of your modem logs for a better understanding? You may have to use the Click-to-Join link at the bottom of this page to upload.
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Dave9
Contributor III
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Do you mean UNcorrectables or correctables? Lots of correctables on OFDM is normal because of the way OFDM uses FEC. Even up to 100% correctables can be considered normal. But UNcorrectables on any channel and any modulation is never normal. If you have UNcorrectables it means there's a problem with the data getting to your modem. You should never disconnect or connect the coax cable with the modem powered on. This will cause a large number of uncorrectables.
As far as I know Cox only supports 1 downstream OFDM channel and 0 upstream OFDM channels at this time in all areas. 1 OFDM channel is more than enough to support fill gigabit speeds.
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Bruce
+4 more
Honored Contributor III
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I'll presume you have a DOCSIS 3.1 modem. Did you notice the 32 Downstream QAM channels? QAM channels used to be single channels (SC-QAM) separated by "guard bands."
With D3.1, although you see only 1 OFDM channel, it's 1 channel divided into 32 QAM channels but with orthogonal separation.
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