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acrelle
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Gig1 Fibre self install - low power levels and inconsistent speeds

Hi, upgraded to Gig1 fibre last week, but getting low power levels reported in the hub, the lowest power is a touch below -7.

Is there any way this can be checked remotely? I've seen in some posts that the 3.1 downstream at QAM2048 might be a sign that there may be interference on the line?

Just ran 3 samknows realspeed tests in a row. Speed to virgin media hub was 395, 889, 380.

3.0 Downstream channels

ChannelFrequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID
25331000000-2.70000138.605377QAM25625
10211000000-1.40000238.983261QAM25610
11219000000-2.00000038.605377QAM25611
12227000000-2.09999838.983261QAM25612
13235000000-2.50000038.983261QAM25613
14243000000-2.09999838.983261QAM25614
15251000000-2.40000238.983261QAM25615
16259000000-2.20000138.605377QAM25616
17267000000-2.09999838.983261QAM25617
18275000000-2.00000038.983261QAM25618
19283000000-2.20000138.983261QAM25619
20291000000-1.59999838.605377QAM25620
21299000000-1.29999938.605377QAM25621
22307000000-1.40000238.983261QAM25622
23315000000-2.20000138.605377QAM25623
24323000000-2.50000038.983261QAM25624
26339000000-2.59999838.983261QAM25626
27347000000-2.90000238.605377QAM25627
28355000000-3.40000238.605377QAM25628
29363000000-3.09999838.983261QAM25629
30371000000-3.00000038.983261QAM25630
31379000000-3.70000138.983261QAM25631
32387000000-4.59999838.983261QAM25632
33395000000-5.29999938.605377QAM25633
34403000000-5.40000237.636276QAM25634
35411000000-5.50000038.605377QAM25635
36419000000-5.79999938.605377QAM25636
37427000000-6.00000038.605377QAM25637
38435000000-7.09999837.636276QAM25638
39443000000-6.20000138.983261QAM25639
40451000000-6.09999838.983261QAM25640



3.0 Downstream channels

ChannelLock StatusRxMER (dB)Pre RS ErrorsPost RS Errors
25Locked38.60537700
10Locked38.98326100
11Locked38.60537700
12Locked38.98326100
13Locked38.98326100
14Locked38.98326100
15Locked38.98326100
16Locked38.60537700
17Locked38.98326100
18Locked38.98326100
19Locked38.98326100
20Locked38.60537700
21Locked38.60537700
22Locked38.98326100
23Locked38.60537700
24Locked38.98326100
26Locked38.98326100
27Locked38.60537700
28Locked38.60537700
29Locked38.98326100
30Locked38.98326100
31Locked38.98326100
32Locked38.98326100
33Locked38.60537700
34Locked37.63627600
35Locked38.60537700
36Locked38.60537700
37Locked38.60537700
38Locked37.63627600
39Locked38.98326100
40Locked38.98326100



3.1 Downstream channels
ChannelChannel Width (MHz)FFT TypeNumber of Active SubcarriersModulation (Active Profile)First Active Subcarrier (Hz)
41964K1880QAM2048759


3.1 Downstream channels
Channel IDLock StatusRxMER Data (dB)PLC Power (dBmV)Correcteds (Active Profile)Uncorrectables (Active Profile)
41Locked34-14.81313035936

 

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Andrew-G
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Alessandro Volta
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Message 2 of 6
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Re: Gig1 Fibre self install - low power levels and inconsistent speeds

You've diagnosed your own problem, I've marked that for a staff response - they'll book you a technician unless the cause is a known area fault that's already being worked on.

Ashleigh_C
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Helpful Answer

Re: Gig1 Fibre self install - low power levels and inconsistent speeds

Hi there @acrelle 

 

Thank you so much for your post and I am so sorry to hear that you have faced these issues! 

 

It does appear that there are a few issues showing on our side here as well, for that reason I think it would be best if we arranged for an engineer to look into this for you! 

 

I will send you a PM now so we can arrange it. Please keep an eye out for the purple envelope in the top right corner of your screen alerting you to a new message. 

 

Thank you. 

Ash_C
Forum Team



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acrelle
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Re: Gig1 Fibre self install - low power levels and inconsistent speeds

PM received, thank you 🙂

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acrelle
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Re: Gig1 Fibre self install - low power levels and inconsistent speeds

Hi, things have improved. Much thanks to those who helped!

So took a couple of engineer visits to get this sorted, the problem resided somewhere between the street cabinet and hub.

If I understood correctly, there was a ~15dBm loss in the cable that runs from the roadside connection at my house, and the Hub. This cable was old and that had been laid underneath a patio, with a three way splitter in a box that was partially submerged. New cable was the solution when the splitter couldn't be accessed and removed by the engineers. 

Modem stats after the work took place.

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

212990000007.50000040.366287QAM25621
102110000006.90000238.983261QAM25610
112190000006.50000038.605377QAM25611
122270000006.40000238.605377QAM25612
132350000006.09999838.605377QAM25613
142430000006.19999738.983261QAM25614
152510000006.19999738.983261QAM25615
162590000006.40000240.366287QAM25616
172670000006.59999840.366287QAM25617
182750000006.69999740.366287QAM25618
192830000006.69999740.366287QAM25619
202910000006.90000240.366287QAM25620
223070000007.50000040.366287QAM25622
233150000007.19999740.366287QAM25623
243230000006.59999838.983261QAM25624
253310000006.69999740.366287QAM25625
263390000006.59999840.946209QAM25626
273470000006.59999840.366287QAM25627
283550000006.40000240.366287QAM25628
293630000006.30000340.366287QAM25629
303710000005.80000338.983261QAM25630
313790000005.50000038.983261QAM25631
323870000005.09999838.983261QAM25632
333950000004.50000038.983261QAM25633
344030000004.40000238.983261QAM25634
354110000004.19999738.983261QAM25635
364190000004.09999838.983261QAM25636
374270000004.30000338.983261QAM25637
384350000004.00000038.983261QAM25638
394430000004.09999840.946209QAM25639
404510000004.00000038.983261QAM256

40

 

3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

21Locked40.36628700
10Locked38.98326100
11Locked38.60537700
12Locked38.60537700
13Locked38.60537700
14Locked38.98326100
15Locked38.98326100
16Locked40.36628700
17Locked40.36628700
18Locked40.36628700
19Locked40.36628700
20Locked40.36628700
22Locked40.36628700
23Locked40.36628700
24Locked38.98326100
25Locked40.36628700
26Locked40.94620900
27Locked40.36628700
28Locked40.36628700
29Locked40.36628700
30Locked38.98326100
31Locked38.98326100
32Locked38.98326100
33Locked38.98326100
34Locked38.98326100
35Locked38.98326100
36Locked38.98326100
37Locked38.98326100
38Locked38.98326100
39Locked40.94620900
40Locked38.98326100
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acrelle
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Re: Gig1 Fibre self install - low power levels and inconsistent speeds

Hi,

Thanks all for the help. Took a couple of engineer visits to resolve, but power levels are normal and monitoring speeds now.

There was an old cable that had been laid under a patio. This had a three way splitter in a box that couldn't be access. A new cable was laid to prevent a 15 dBm loss that was happening between the roadside connection point and the Hub.

New modem stats

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

212990000007.50000040.366287QAM25621
102110000006.90000238.983261QAM25610
112190000006.50000038.605377QAM25611
122270000006.40000238.605377QAM25612
132350000006.09999838.605377QAM25613
142430000006.19999738.983261QAM25614
152510000006.19999738.983261QAM25615
162590000006.40000240.366287QAM25616
172670000006.59999840.366287QAM25617
182750000006.69999740.366287QAM25618
192830000006.69999740.366287QAM25619
202910000006.90000240.366287QAM25620
223070000007.50000040.366287QAM25622
233150000007.19999740.366287QAM25623
243230000006.59999838.983261QAM25624
253310000006.69999740.366287QAM25625
263390000006.59999840.946209QAM25626
273470000006.59999840.366287QAM25627
283550000006.40000240.366287QAM25628
293630000006.30000340.366287QAM25629
303710000005.80000338.983261QAM25630
313790000005.50000038.983261QAM25631
323870000005.09999838.983261QAM25632
333950000004.50000038.983261QAM25633
344030000004.40000238.983261QAM25634
354110000004.19999738.983261QAM25635
364190000004.09999838.983261QAM25636
374270000004.30000338.983261QAM25637
384350000004.00000038.983261QAM25638
394430000004.09999840.946209QAM25639
404510000004.00000038.983261QAM25640



3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

21Locked40.36628700
10Locked38.98326100
11Locked38.60537700
12Locked38.60537700
13Locked38.60537700
14Locked38.98326100
15Locked38.98326100
16Locked40.36628700
17Locked40.36628700
18Locked40.36628700
19Locked40.36628700
20Locked40.36628700
22Locked40.36628700
23Locked40.36628700
24Locked38.98326100
25Locked40.36628700
26Locked40.94620900
27Locked40.36628700
28Locked40.36628700
29Locked40.36628700
30Locked38.98326100
31Locked38.98326100
32Locked38.98326100
33Locked38.98326100
34Locked38.98326100
35Locked38.98326100
36Locked38.98326100
37Locked38.98326100
38Locked38.98326100
39Locked40.94620900
40Locked38.98326100
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