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Intermittent connectivity issues

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Frequent Visitor

Intermittent connectivity issues

any thoughts on the power levles of downstream channels? or the power on the downstream OFDM channels? Look at all the uncorrected codewords.

 

Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency

Startup Procedure

ProcedureStatusComment
Acquire Downstream Channel615000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>

ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25625615000000 Hz8.0 dBmV40.6 dB239706062566
2LockedQAM2561459000000 Hz7.4 dBmV40.9 dB2250736550219
3LockedQAM2562465000000 Hz7.5 dBmV41.0 dB2251030335220
4LockedQAM2563471000000 Hz7.6 dBmV41.0 dB2251456036226
5LockedQAM2564477000000 Hz7.5 dBmV40.8 dB2251897156219
6LockedQAM2565483000000 Hz7.5 dBmV40.8 dB2252291544198
7LockedQAM2566489000000 Hz7.5 dBmV40.7 dB2252656244184
8LockedQAM2567495000000 Hz7.3 dBmV40.5 dB2253034457211
9LockedQAM2568507000000 Hz7.6 dBmV40.4 dB2253419033166
10LockedQAM2569513000000 Hz7.4 dBmV40.6 dB2253771557133
11LockedQAM25610519000000 Hz7.5 dBmV40.6 dB2254146452206
12LockedQAM25611525000000 Hz7.6 dBmV40.7 dB2254517552129
13LockedQAM25612531000000 Hz7.5 dBmV40.7 dB2254937720113
14LockedQAM25613543000000 Hz7.6 dBmV40.7 dB2255247131149
15LockedQAM25614549000000 Hz7.3 dBmV40.6 dB2255669922116
16LockedQAM25615555000000 Hz7.4 dBmV40.8 dB225601171889
17LockedQAM25616561000000 Hz7.3 dBmV40.6 dB2256425049113
18LockedQAM25617567000000 Hz7.3 dBmV40.4 dB2256756335128
19LockedQAM25618573000000 Hz7.2 dBmV40.6 dB225718502389
20LockedQAM25619579000000 Hz7.6 dBmV40.7 dB225751592088
21LockedQAM25620585000000 Hz7.4 dBmV40.7 dB2257915725121
22LockedQAM25621591000000 Hz7.6 dBmV40.6 dB225826661023
23LockedQAM25622597000000 Hz7.8 dBmV40.7 dB225860941470
24LockedQAM25623603000000 Hz7.7 dBmV40.5 dB225899731953
25LockedQAM25624609000000 Hz7.8 dBmV40.5 dB225936281850
26LockedQAM25626621000000 Hz8.0 dBmV40.6 dB225973164560
27LockedQAM25627627000000 Hz8.1 dBmV40.7 dB226020751256
28LockedQAM25628633000000 Hz8.3 dBmV40.6 dB226054511148
29LockedQAM25629639000000 Hz8.1 dBmV40.5 dB226094461956
30LockedQAM25630645000000 Hz8.1 dBmV40.5 dB22613207746
31LockedQAM25631651000000 Hz8.1 dBmV40.5 dB22615366838
32LockedQAM25632657000000 Hz7.9 dBmV40.5 dB226134971257

Upstream Bonded Channels

 
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA917300000 Hz46.3 dBmV
2LockedATDMA1023700000 Hz45.5 dBmV
3LockedATDMA1130100000 Hz44.8 dBmV
4LockedATDMA1236500000 Hz45.8 dBmV
5LockedATDMA1341200000 Hz46.8 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
1Locked0159722000000 Hz9.3 dBmV40.0 dB1126 ~ 29691892848610
2Not Locked000 Hz5.9 dBmV0.0 dB0 ~ 4095000

Upstream OFDMA Channels

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV
Highlighted
Expert

Re: Intermittent connectivity issues

The Downstream power is a tad on the high side but should be o/k. The uncorrectable codewords are very low with respect to the total unerrored codewords ! Are you actually experiencing any connectivity problems ?



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Frequent Visitor

Re: Intermittent connectivity issues

Thank you for he response. I  am experiening intermittent connectivity issues on m ywired and wirelss devices and on my X1 system, I get the error code RDK-03033 multiple times daily. I do not get TV connectivity error codes on my other non-X1 devices.

Highlighted
Expert

Re: Intermittent connectivity issues

Are there any modem RF signal error / event log entries being shown ? If so, please post them as well.



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Frequent Visitor

Re: Intermittent connectivity issues

Recent logs (MAC addresses removed) and trimmed for redundancy.

 

2020-08-17, 12:13:13Warning (5)Dynamic Range Window violation
2020-08-17, 12:13:13Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 12:11:55Warning (5)Dynamic Range Window violation
2020-08-17, 12:11:55Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 12:11:33Warning (5)Dynamic Range Window violation
2020-08-17, 12:11:33Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 12:11:33Warning (5)Dynamic Range Window violation
2020-08-17, 12:11:33Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=2;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 10:32:44Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=:bc;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 09:47:07Warning (5)Dynamic Range Window violation
2020-08-17, 09:47:07Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=2;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 09:46:27Warning (5)Dynamic Range Window violation
2020-08-17, 09:46:27Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 09:31:30Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 09:31:28Warning (5)Dynamic Range Window violation
2020-08-17, 09:31:28Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 09:31:28Warning (5)Dynamic Range Window violation
2020-08-17, 09:31:28Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2020-08-17, 09:31:28Warning (5)Dynamic Range Window violation
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
Highlighted
Expert

Re: Intermittent connectivity issues

Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !



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Frequent Visitor

Re: Intermittent connectivity issues

I appreciate your assistance and for taking the time out of your day to review my issues.

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Expert

Re: Intermittent connectivity issues

My pleasure !



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I am a Customer Expert volunteering my time to help other customers here in the Forums.
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Official Employee

Re: Intermittent connectivity issues

Hello BrianIngersoll, thank you for taking the time out of your day to post on our forum. I have had this issue several times before so I know how frustrating it can be to lose internet and cable TV at the same time with nothing but this error message to blame. The good thing is the problem can be fixed, in my case the tech came out and swapped the cable outside and I haven't seen the error since then. Maybe your fix will be the same, in any case I can get this resolved for you. To get started please send me a private message with your full name and account number by clicking on my name (ComcastAmir) and then click "Send a message".
 


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Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
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