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Hub 5 Downstream Channel check please.

Adduxi
Very Insightful Person
Very Insightful Person

Hi,

Can any of the lovely Mods please run a check on the line serving my Hub 5, thanks.  About 50% of the channels have a very excessive number of PreRS errors which continually build up to 1000's of millions.  I have power cycled the Hub, and run it with and without the attenuator.  This only started about a week ago. The stats below are just after a reboot. Cheers.

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
13310000000.441QAM 25625
21390000002.439QAM 2561
31470000002.239QAM 2562
41550000002.139QAM 2563
51630000001.939QAM 2564
61710000001.839QAM 2565
71790000001.739QAM 2566
81870000001.539QAM 2567
91950000001.639QAM 2568
102030000001.339QAM 2569
112110000001.439QAM 25610
122190000001.139QAM 25611
132270000000.839QAM 25612
142350000000.539QAM 25613
152430000000.239QAM 25614
162510000000.139QAM 25615
17259000000039QAM 25616
182670000000.440QAM 25617
192750000000.540QAM 25618
202830000000.640QAM 25619
212910000000.740QAM 25620
222990000000.640QAM 25621
233070000000.640QAM 25622
243150000000.441QAM 25623
253230000000.441QAM 25624
263390000000.741QAM 25626
273470000000.741QAM 25627
283550000000.641QAM 25628
293630000000.741QAM 25629
303710000000.941QAM 25630
313790000001.141QAM 25631

3.0 Downstream channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked4100
2Locked3950163490
3Locked3955842250
4Locked3955961530
5Locked3961206270
6Locked3955433270
7Locked3956059920
8Locked3961394950
9Locked3955283430
10Locked3956492660
11Locked3961341420
12Locked3956215510
13Locked3956478200
14Locked3961135390
15Locked3955710230
16Locked3954387580
17Locked3949044830
18Locked406568730
19Locked4000
20Locked4000
21Locked4000
22Locked4000
23Locked4000
24Locked4100
25Locked4100
26Locked4100
27Locked4100
28Locked4100
29Locked4100
30Locked4100
31Locked4100
 

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1 ACCEPTED SOLUTION

Accepted Solutions

Adduxi
Very Insightful Person
Very Insightful Person

Hopefully some closure.  🙂

Tech visited and swapped out the Hub, so far no more Downstream PreRS huge numbers.  These would have been prevalent immediately on the old Hub, so fingers crossed..... 

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13 REPLIES 13

Client62
Legend

Is this behaviour the new normal since software version : LG-RDK_6.9.35-2302.6    

Tudor
Very Insightful Person
Very Insightful Person

Looks like noise ingress to me, some of those channels span the DAB radio frequencies. 


Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2

Tudor
Very Insightful Person
Very Insightful Person

Another possibility is a bad amp in the street cabinet. Definitely think you need a technician’s visit.


Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2

Adduxi
Very Insightful Person
Very Insightful Person

@Tudor  Agree.  Nothing has been touched or changed on site.  This anomaly just appeared out of the blue before the firmware change. Most likely something faulty in the cabinet.  Hopefully a simple card change in the cabinet?

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Tom_W1
Forum Team
Forum Team

Hi @Adduxi thanks for your post here in the Community, we're sorry to hear of your concerns and hope you're well.

We're struggling to run tests on your Hub from here, so please allow me to send you a PM so I can look into this further for you and send a technician if necessary.

Please respond directly when you can!
Many thanks

Tom_W

Tom_W1
Forum Team
Forum Team

Hi @Adduxi thanks for your co-operation via PM - we're going back publicly now.

So we've ran checks and there aren't any issues on the line we can identify, at the time of the checks being ran all the channels (including downstream) are within specifications so your services should be running perfectly.

What issues are you having with the service please, is it intermittency or low speeds for example?

Many thanks

Tom_W

Adduxi
Very Insightful Person
Very Insightful Person

Hi @Tom_W1 

Yes, the power levels are within limits and the BQM i have is fine.  However if you look at the stats being reported by the Hub, they are odd.  I can't say I've noticed any issues with the circuit, but something is amiss.  These errors have only shown up within the past couple of weeks out of the blue.  There have been no changes to my end at all.  I'm wondering if you say there are no issues on my circuit, maybe the problem is with the Hub 5?  For the many years I had the old white trial Hub 3, I've never seen this before.

Anyway, here are the latest stats from the Hub 5, it's on the latest firmware LG-RDK_6.9.35-2302.6, and the uptime is 3 days.   As you can note, the Downstream PreRS errors on 50% of the channels are reporting huge numbers and the 3.1 Upstream channel also has a large number of T3 errors.  

Please see what you can gather from this information as to whether or not a new Hub or a tech visit would be needed.

 

Network Log  
   

Time

PriorityDescription
09/10/2023 10:26errorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
09/10/2023 08:32criticalUnicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
09/10/2023 08:32critical16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
09/10/2023 08:31criticalStarted Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04noticeREGISTRATION COMPLETE - Waiting for Operational status
06/10/2023 16:04noticeUS profile assignment change. US Chan ID: 12; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04noticeDS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04noticeTLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04warningDHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04noticeHonoring MDD; IP provisioning mode = IPv4
06/10/2023 16:04criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06/10/2023 16:04criticalCable Modem Reboot because of - HW or Power-On Reset

 

 

3.0 Upstream channels     
      

Channel

Frequency (Hz)Power (dBmV)Symbol Rate (ksps)ModulationChannel ID
04960000046.55120QAM 641
14310000046.55120QAM 642
23660000046.35120QAM 643
33010000046.35120QAM 644
423600000465120QAM 645
      
3.0 Upstream channels     
      

Channel

Channel TypeT1 TimeoutsT2 TimeoutsT3 TimeoutsT4 Timeouts
0ATDMA0000
1ATDMA0000
2ATDMA0000
3ATDMA0000
4ATDMA0000
      

3.1 Upstream channels

     
      
ChannelChannel Width (MHz)Power (dBmV)FFT TypeModulation 
1210.4422KQAM 256 
      
3.1 Upstream channels     
      
ChannelChannel TypeNumber of Active SubcarriersFirst Active Subcarrier (Hz)T3 TimeoutsT4 Timeouts
12OFDMA20874000000180

 

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Adduxi
Very Insightful Person
Very Insightful Person

Part two of post with Downstream information;

 

3.0 Downstream channels     
      

Channel

Frequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID
13310000000.441QAM 25625
21390000002.439QAM 2561
31470000002.239QAM 2562
41550000002.139QAM 2563
51630000001.939QAM 2564
61710000001.839QAM 2565
71790000001.739QAM 2566
81870000001.639QAM 2567
91950000001.639QAM 2568
102030000001.439QAM 2569
112110000001.439QAM 25610
122190000001.139QAM 25611
132270000000.839QAM 25612
142350000000.539QAM 25613
152430000000.139QAM 25614
162510000000.139QAM 25615
17259000000039QAM 25616
182670000000.440QAM 25617
192750000000.440QAM 25618
202830000000.541QAM 25619
212910000000.640QAM 25620
222990000000.640QAM 25621
233070000000.641QAM 25622
243150000000.441QAM 25623
253230000000.441QAM 25624
263390000000.740QAM 25626
273470000000.741QAM 25627
283550000000.641QAM 25628
293630000000.641QAM 25629
303710000000.941QAM 25630
31379000000141QAM 25631
      
3.0 Downstream channels     
      

Channel

Locked StatusRxMER (dB)Pre RS ErrorsPost RS Errors 
1Locked4120 
2Locked3918289159790 
3Locked3920370508890 
4Locked3920412584960 
5Locked3922306861880 
6Locked3920202829710 
7Locked3920441290560 
8Locked3922372313270 
9Locked3920140241620 
10Locked3920584786460 
11Locked3922354751880 
12Locked3920488149710 
13Locked3920591562590 
14Locked3922273330430 
15Locked3920284961920 
16Locked3919807007620 
17Locked3917862649720 
18Locked402396662760 
19Locked4000 
20Locked4100 
21Locked4010 
22Locked4040 
23Locked4140 
24Locked4120 
25Locked4130 
26Locked4020 
27Locked4110 
28Locked4110 
29Locked4160 
30Locked4120 
31Locked4110 
      

3.1 Downstream channels

     
      
ChannelChannel Width (MHz)FFT TypeNumber of Active SubcarriersModulation (Active Profile)First Active Subcarrier (Hz)
33944K1840QAM 40961108
      
3.1 Downstream channels     
      
Channel IDLocked StatusRxMER Data (dB)PLC Power (dBmV)Corrected errors (Active Profile)Uncorrectable errors (Active Profile)
33Locked41-0.925054744490

 

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Adduxi
Very Insightful Person
Very Insightful Person

@Tom_W1   Hub fell over last night at approx 21:30 as  recorded by my BQM.  I had to  do a pinhole reset this morning to get the Hub back up again.   Upon reboot, the huge  amount of PreRS errors have started again on the same 50% of the Downstream channels, and I think there is an issue that needs VM to sort. Can this be picked up please.  If this Hub is going to fail every  5 or 6 days uptime, that's not acceptable.

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