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Correctable Codewords DOCSIS 3.1

Orosta
New Poster

Correctable Codewords DOCSIS 3.1

I'm getting sporadic errors on channels 1-31 and tons of correctable codewords on OFDM channel. It makes for packet loss and slow loading of websites.

 

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel609000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25636609000000 Hz2.4 dBmV42.7 dB381298398520
2LockedQAM2568435000000 Hz4.0 dBmV44.4 dB381190249500
3LockedQAM2569441000000 Hz3.9 dBmV44.5 dB381190934200
4LockedQAM25610447000000 Hz3.8 dBmV44.4 dB381191091920
5LockedQAM25611453000000 Hz3.7 dBmV44.3 dB381191639100
6LockedQAM25612459000000 Hz3.6 dBmV44.2 dB381191694400
7LockedQAM25613465000000 Hz3.5 dBmV44.2 dB381191907000
8LockedQAM25614471000000 Hz3.4 dBmV44.1 dB381192459100
9LockedQAM25615477000000 Hz3.4 dBmV44.0 dB381195852310
10LockedQAM25616483000000 Hz3.2 dBmV44.0 dB381196234600
11LockedQAM25617489000000 Hz3.1 dBmV43.7 dB381197272600
12LockedQAM25618495000000 Hz3.0 dBmV43.6 dB381197333000
13LockedQAM25619507000000 Hz2.8 dBmV43.4 dB381197825300
14LockedQAM25620513000000 Hz2.7 dBmV43.4 dB381198527210
15LockedQAM25621519000000 Hz2.8 dBmV43.4 dB381198700010
16LockedQAM25622525000000 Hz2.6 dBmV43.3 dB381198855810
17LockedQAM25623531000000 Hz2.6 dBmV43.4 dB381205923600
18LockedQAM25624537000000 Hz2.6 dBmV43.2 dB381206147000
19LockedQAM25625543000000 Hz2.4 dBmV43.4 dB381206796500
20LockedQAM25626549000000 Hz2.4 dBmV43.4 dB381206865200
21LockedQAM25627555000000 Hz2.2 dBmV43.2 dB381207790400
22LockedQAM25628561000000 Hz2.3 dBmV43.2 dB381207445830
23LockedQAM25629567000000 Hz2.2 dBmV43.1 dB381208029410
24LockedQAM25630573000000 Hz2.2 dBmV43.0 dB381208695220
25LockedQAM25631579000000 Hz2.4 dBmV43.0 dB381209018720
26LockedQAM25632585000000 Hz2.3 dBmV43.3 dB381209135630
27LockedQAM25633591000000 Hz2.4 dBmV43.0 dB381209579200
28LockedQAM25634597000000 Hz2.6 dBmV43.1 dB381211847140
29LockedQAM25635603000000 Hz2.5 dBmV42.8 dB381209914850
30LockedQAM25637615000000 Hz2.2 dBmV42.7 dB381210243030
31LockedQAM25638621000000 Hz2.1 dBmV42.6 dB381210959150
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

Upstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA919300000 Hz47.0 dBmV
2LockedATDMA1025700000 Hz47.3 dBmV
3LockedATDMA1132300000 Hz47.5 dBmV
4LockedATDMA1238700000 Hz47.8 dBmV
5Not LockedUnknown00 Hz0.0 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

Downstream OFDM Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 348688000000 Hz2.3 dBmV39.3 dB1108 ~ 29879562428651590820360
2Not Locked000 Hz3.1 dBmV0.0 dB0 ~ 4095000

Upstream OFDMA Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV
darkangelic
Expert

Re: Correctable Codewords DOCSIS 3.1

DOCSIS 3.1 allows for Forward Error Correction. As long as the codewords are correctable it isn't a problem.  I suspect something else is going on as far as slow loading of websites.  Tried clearing your browser or DNS cache, running a ping or traceroute, other troubleshooting methods?

 

See: Internet Troubleshooting Tips   for more info.


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EG
Expert

Re: Correctable Codewords DOCSIS 3.1

@Orosta wrote:

and tons of correctable codewords on OFDM channel.

 

FWIW, there is a known glitch with some makes / models of modem's firmware where the measuring mechanism incorrectly reads the power level, the SNR, and the bit errors for that channel. So it reads many errors when there really aren't.



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!