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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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13 REPLIES 13

gitty
Fibre optic

Can you post the current codeword numbers, including OFDM? Your OFDMA channel is reported to start at 74 MHz... Did that change when you got the new firmware? I find it strange (I've seen many display bugs). 

Adduxi
Very Insightful Person
Very Insightful Person

@gitty   As I had to pinhole the Hub to get it back up, it's not yet back to the very latest firmware.  There is no information regarding the 3.1 DOCSIS   I don't suspect this was the firmware, as from memory this started prior to the latest firmware push.

The thing I find so frustrating, is giving @Tom_W1  all the information from the Hub only to be told there is nothing wrong with the circuit.  If 50% of the Downstream channels playing up is not a fault, I'd love to know what is !!

Anyway, we'll hopefully see a response from VM in due course.

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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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Hi @Adduxi 

Thanks for the update. Glad to hear all seems sorted,

Keep us posted if you need further help.

Best wishes.

John_GS
Forum Team


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