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sp_morris
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New Gig1 Hub4 slowness

Hi,

I'd appreciate some advice as to whether I need an engineer to come out to a new Gig1 installation. It was upgraded just over a week ago and the speed to the hub on samknows was over 1Gb initially which was great, but the last two days I've been getting anything from 2Mb - 200Mb, but more often only 40Mb or less. I called Virgin and got put through to 2nd line support and was told that they were upgrading in my area and the service might be patchy until the 11 Feb and then they hung up (I hope it was by mistake), but I can't have it this unusable until the 11th Feb. The support engineer didnt even run any diagnostics to check if there was a problem at my end. I've added network status below and would appreciate if some one that understands this can comment.

Thanks in advance

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sp_morris
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Re: New Gig1 Hub4 slowness

3.0 Downstream channels

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

25330750000-4.838.6QAM25625
1138750000-8.129.1QAM2561
2146750000-6.729.6QAM2562
3154750000-7.229.1QAM2563
4162750000-6.431.1QAM2564
5170750000-534QAM2565
6178750000-4.434.3QAM2566
7186750000-4.833.8QAM2567
8194750000-4.836.4QAM2568
9202750000-5.235.8QAM2569
10210750000-6.134.9QAM25610
11218750000-7.233.5QAM25611
12226750000-6.635.1QAM25612
13234750000-7.335.8QAM25613
14242750000-8.835.8QAM25614
15250750000-10.335.1QAM25615
16258750000-10.635.1QAM25616
17266750000-10.834.9QAM25617
18274750000-8.835.1QAM25618
19282750000-6.136.4QAM25619
20290750000-4.536.6QAM25620
21298750000-3.537.4QAM25621
22306750000-3.437.6QAM25622
23314750000-3.637.6QAM25623
24322750000-4.137.6QAM25624
26370750000-7.636.6QAM25626
27378750000-9.836.4QAM25627
28386750000-10.935.8QAM25628
29394750000-10.835.6QAM25629
30402750000-9.736.4QAM25630
31410750000-8.537.4QAM25631
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sp_morris
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Re: New Gig1 Hub4 slowness

3.0 Downstream channels

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

25Locked38.60537740
1Locked29.103352689163159049
2Locked29.57447679766420603
3Locked29.103352670912177514
4Locked31.072100796406564
5Locked33.9565091405340
6Locked34.3456882704670
7Locked33.8341643207790
8Locked36.38689057900
9Locked35.7799111066710
10Locked34.9256101804320
11Locked33.4865424154973
12Locked35.0835491042690
13Locked35.779911185270
14Locked35.779911431470
15Locked35.0835491461530
16Locked35.083549504450
17Locked34.9256102840
18Locked35.0835493220
19Locked36.386890410
20Locked36.6096534000
21Locked37.355988260
22Locked37.63627680
23Locked37.63627600
24Locked37.63627610
26Locked36.60965310
27Locked36.386890340
28Locked35.7799111130
29Locked35.595078460
30Locked36.38689000
31Locked37.35598800
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sp_morris
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Re: New Gig1 Hub4 slowness

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

159864K1680QAM256424



3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

159Locked33-12.7457184511296
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carl_pearce
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Re: New Gig1 Hub4 slowness


@sp_morris wrote:

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

159864K1680QAM256424



3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

159Locked33-12.7457184511296

There isn't much right with your line to be honest:

  • Downstream power levels out of spec (-6 to + 10 is in spec, 0dB optimal).
  • SNR all over the place.
  • DOCSIS 3.1 power level too low and QAM level is low (Should be 4096).
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sp_morris
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Re: New Gig1 Hub4 slowness

Thanks for the quick response Carl. 

I assume in this case I should keep calling support and insist they send out an engineer?

Cheers
Steve

 

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carl_pearce
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Re: New Gig1 Hub4 slowness


@sp_morris wrote:

Thanks for the quick response Carl. 

I assume in this case I should keep calling support and insist they send out an engineer?

Cheers
Steve

 


I can't see how 'upgrades' could fix such bad line quality, so yes, you need to persist with VM.

EDIT: Maybe 'upgrades' could be the cause, not easy to tell.

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