General 50MB - Intermittent Fault

chambohambo · 13-08-2016, 15:59

Hi,

I have a intermittent fault which comes and goes. The problem is the upstream power level on both upstreams goes to 54dBmV, between Tuesday and Friday the power levels were very stable. What could be the cause of the fault I am getting? I get the exact same problem with the TiVo box, which means on demand, YouTube, BBC iPlayer does not work, the picture and sound never breaks up when the fault occurs.

By the way, the downstream power level and SNR are stable when the uptream power level goes to 54dBmV.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 3.8 dBmV 39.0 dB 792 563
Locked 3 267000000 Hz 256 QAM 3.3 dBmV 37.9 dB 1719 527
Locked 4 275000000 Hz 256 QAM 3.4 dBmV 38.3 dB 577 502
Locked 5 283000000 Hz 256 QAM 3.6 dBmV 37.9 dB 562 513
Locked 6 291000000 Hz 256 QAM 3.5 dBmV 39.0 dB 535 525
Locked 7 299000000 Hz 256 QAM 3.6 dBmV 39.0 dB 426 414
Locked 8 307000000 Hz 256 QAM 3.4 dBmV 39.4 dB 545 531
Locked 10 323000000 Hz 256 QAM 4.2 dBmV 39.4 dB 612 601

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 46.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 46.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

chambohambo · 13-08-2016, 19:13

Update 19:37.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.9 dBmV 39.0 dB 1251 607
Locked 3 267000000 Hz 256 QAM 4.3 dBmV 38.3 dB 3690 607
Locked 4 275000000 Hz 256 QAM 4.5 dBmV 38.3 dB 925 693
Locked 5 283000000 Hz 256 QAM 4.6 dBmV 38.3 dB 715 568
Locked 6 291000000 Hz 256 QAM 4.4 dBmV 39.4 dB 639 564
Locked 7 299000000 Hz 256 QAM 4.5 dBmV 39.4 dB 527 449
Locked 8 307000000 Hz 256 QAM 4.3 dBmV 39.4 dB 642 576
Locked 10 323000000 Hz 256 QAM 5.3 dBmV 39.9 dB 888 830

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 54.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 54.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 19:49 ---------- Previous post was at 19:36 ----------

Update 19:49.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 5.8 dBmV 39.4 dB 1287 620
Locked 3 267000000 Hz 256 QAM 5.4 dBmV 38.6 dB 3870 624
Locked 4 275000000 Hz 256 QAM 5.4 dBmV 38.6 dB 944 707
Locked 5 283000000 Hz 256 QAM 5.6 dBmV 38.3 dB 730 581
Locked 6 291000000 Hz 256 QAM 5.4 dBmV 39.9 dB 656 580
Locked 7 299000000 Hz 256 QAM 5.6 dBmV 39.9 dB 543 465
Locked 8 307000000 Hz 256 QAM 5.4 dBmV 39.9 dB 659 593
Locked 10 323000000 Hz 256 QAM 6.0 dBmV 39.9 dB 904 846

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 46.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 54.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 19:51 ---------- Previous post was at 19:49 ----------

Update 19:51.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 5.6 dBmV 39.4 dB 1288 620
Locked 3 267000000 Hz 256 QAM 5.2 dBmV 38.6 dB 3880 624
Locked 4 275000000 Hz 256 QAM 5.2 dBmV 38.6 dB 944 707
Locked 5 283000000 Hz 256 QAM 5.4 dBmV 38.3 dB 730 581
Locked 6 291000000 Hz 256 QAM 5.4 dBmV 39.9 dB 656 580
Locked 7 299000000 Hz 256 QAM 5.5 dBmV 39.4 dB 543 465
Locked 8 307000000 Hz 256 QAM 5.3 dBmV 39.9 dB 659 593
Locked 10 323000000 Hz 256 QAM 5.9 dBmV 39.9 dB 904 846

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 42.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 42.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 19:53 ---------- Previous post was at 19:51 ----------

Update 19:53.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.3 dBmV 39.0 dB 1289 620
Locked 3 267000000 Hz 256 QAM 4.0 dBmV 38.3 dB 3893 624
Locked 4 275000000 Hz 256 QAM 4.0 dBmV 38.3 dB 944 707
Locked 5 283000000 Hz 256 QAM 4.2 dBmV 38.3 dB 730 581
Locked 6 291000000 Hz 256 QAM 4.1 dBmV 39.4 dB 656 580
Locked 7 299000000 Hz 256 QAM 4.2 dBmV 39.4 dB 543 465
Locked 8 307000000 Hz 256 QAM 4.0 dBmV 39.4 dB 659 593
Locked 10 323000000 Hz 256 QAM 4.7 dBmV 39.9 dB 904 846

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 43.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 43.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 19:53 ---------- Previous post was at 19:53 ----------

Update 19:53.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.0 dBmV 38.6 dB 1290 620
Locked 3 267000000 Hz 256 QAM 3.3 dBmV 37.9 dB 3908 624
Locked 4 275000000 Hz 256 QAM 3.5 dBmV 38.3 dB 944 707
Locked 5 283000000 Hz 256 QAM 3.7 dBmV 37.9 dB 730 581
Locked 6 291000000 Hz 256 QAM 3.6 dBmV 39.0 dB 656 580
Locked 7 299000000 Hz 256 QAM 3.7 dBmV 39.4 dB 543 465
Locked 8 307000000 Hz 256 QAM 3.5 dBmV 39.4 dB 659 593
Locked 10 323000000 Hz 256 QAM 4.5 dBmV 39.4 dB 904 846

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 47.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 48.3 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 19:57 ---------- Previous post was at 19:53 ----------

I have no idea why the power levels keep swinging around like that. One thing for sure though, it is not normal lol.

---------- Post added at 19:59 ---------- Previous post was at 19:57 ----------

Update 19:59.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.8 dBmV 38.6 dB 1348 620
Locked 3 267000000 Hz 256 QAM 4.3 dBmV 38.3 dB 4031 624
Locked 4 275000000 Hz 256 QAM 4.5 dBmV 38.3 dB 1004 719
Locked 5 283000000 Hz 256 QAM 4.6 dBmV 38.3 dB 783 581
Locked 6 291000000 Hz 256 QAM 4.5 dBmV 39.4 dB 696 580
Locked 7 299000000 Hz 256 QAM 4.5 dBmV 39.4 dB 586 465
Locked 8 307000000 Hz 256 QAM 4.4 dBmV 39.4 dB 688 593
Locked 10 323000000 Hz 256 QAM 5.4 dBmV 39.9 dB 931 846

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 49.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 52.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 20:13 ---------- Previous post was at 19:59 ----------

Update 20:13.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.9 dBmV 39.0 dB 1378 620
Locked 3 267000000 Hz 256 QAM 4.4 dBmV 38.3 dB 4167 624
Locked 4 275000000 Hz 256 QAM 4.5 dBmV 38.3 dB 1016 719
Locked 5 283000000 Hz 256 QAM 4.7 dBmV 38.3 dB 785 581
Locked 6 291000000 Hz 256 QAM 4.5 dBmV 39.4 dB 696 580
Locked 7 299000000 Hz 256 QAM 4.6 dBmV 39.4 dB 586 465
Locked 8 307000000 Hz 256 QAM 4.4 dBmV 39.4 dB 688 593
Locked 10 323000000 Hz 256 QAM 5.4 dBmV 39.9 dB 931 846

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 54.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 54.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

MUD_Wizard · 14-08-2016, 04:43

Quote:

Originally Posted by chambohambo

Hi,

I have a intermittent fault which comes and goes. The problem is the upstream power level on both upstreams goes to 54dBmV, between Tuesday and Friday the power levels were very stable. What could be the cause of the fault I am getting?

Noise on the upstream, causing the modem to keep increasing upstream power levels as the CMTS cannot hear it. So the upstream power eventually maxes out at 54 dBmV. Which is the maximum power level for two 64 QAM upstreams.

You will likely see T3 and/or T4 timeouts (disconnections on the upstream) in your network log as well when this happens, though it is not guaranteed. The modem may stay online at that power level.

---------- Post added at 05:43 ---------- Previous post was at 05:37 ----------

Quote:

Originally Posted by chambohambo

I get the exact same problem with the TiVo box

Naturally because both the hub and Tivo have Docsis modems inside that work the same way, with the same relative power limitations to the number of upstream channels and the modulation being used.

Quote:

Originally Posted by chambohambo

which means on demand, YouTube, BBC iPlayer does not work, the picture and sound never breaks up when the fault occurs.

When the upstream power is maxed out you may be getting very low download speeds.

chambohambo · 14-08-2016, 06:51

Thanks for taking the time to respond to my post.

How do you pin point the cause of this fault? I have a technician coming out in a few days from Virgin Media, knowing my luck when the technician arrives, all the power levels will be stable.

Quote:

Originally Posted by MUD_Wizard

Noise on the upstream, causing the modem to keep increasing upstream power levels as the CMTS cannot hear it. So the upstream power eventually maxes out at 54 dBmV. Which is the maximum power level for two 64 QAM upstreams.

You will likely see T3 and/or T4 timeouts (disconnections on the upstream) in your network log as well when this happens, though it is not guaranteed. The modem may stay online at that power level.

---------- Post added at 05:43 ---------- Previous post was at 05:37 ----------

Naturally because both the hub and Tivo have Docsis modems inside that work the same way, with the same relative power limitations to the number of upstream channels and the modulation being used.

When the upstream power is maxed out you may be getting very low download speeds.

---------- Post added at 07:49 ---------- Previous post was at 07:44 ----------

Power levels 07:49.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 5.9 dBmV 38.6 dB 3684 819
Locked 3 267000000 Hz 256 QAM 5.6 dBmV 38.3 dB 14187 753
Locked 4 275000000 Hz 256 QAM 5.5 dBmV 38.3 dB 2129 843
Locked 5 283000000 Hz 256 QAM 5.7 dBmV 37.9 dB 1325 765
Locked 6 291000000 Hz 256 QAM 5.7 dBmV 39.0 dB 872 660
Locked 7 299000000 Hz 256 QAM 5.8 dBmV 39.4 dB 776 571
Locked 8 307000000 Hz 256 QAM 5.6 dBmV 39.4 dB 872 694
Locked 10 323000000 Hz 256 QAM 6.3 dBmV 39.9 dB 1191 1024

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 42.3 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 41.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 07:51 ---------- Previous post was at 07:49 ----------

TiVo power level.

Return Power: 41dBmV
SNR: 40dB

vm_tech · 14-08-2016, 07:17

Quote:

Originally Posted by MUD_Wizard

[COLOR="DarkRed"]Noise on the upstream, causing the modem to keep increasing upstream power levels as the CMTS cannot hear it. So the upstream power eventually maxes out at 54 dBmV. Which is the maximum power level for two 64 QAM upstreams.

No, much more likely to be an amplifier or a faulty tap or connection

chambohambo · 14-08-2016, 07:33

Thanks for taking the time to respond to my post.

I seen a technician in the street during the week, I told him my problem and showed him my power levels and he showed me inside my cabinet and he moved me to another tap as he said they needed boosting. I did say to him is it possible it could be the amp he said if it was the amp lots of customers from around my area would be ringing in saying there Broadband and TV are not working.

Quote:

Originally Posted by vm_tech

No, much more likely to be an amplifier or a faulty tap or connection

---------- Post added at 08:33 ---------- Previous post was at 08:30 ----------

By the way, from what I seen the cab it looked ok. I was directly connected to the tap, like all the other customers. I have heard on here some customers are sharing taps with splitters involved, which is classed as a oversubscribed cab.

General Maximus · 14-08-2016, 19:38

Moving your tap point will bring your power levels back in spec for now but if there is noise on the network which gets fixed this week then your newly lowered tap point (depending on how low they have out you) may now take your power levels out of spec. The tech is correct in saying that if there was a problem a lot of customers would be ringing up complaining but they only know there is a problem when a tonne of calls get logged, it is circular reasoning. It takes a tech to come out to two or three of the same jobs in the same area to notice the fault and then he escalates it to networks to get fixed. Unfortunately not everyone is tech savvy and looks at their power levels to see what is wrong so these things don't always get picked up immediately.

chambohambo · 14-08-2016, 22:11

Thanks for taking the time to respond to my post.

My power levels before they got boosted were on the downstream -4 to -6 and on the upstream 51 to 53. I was on the second tap to the bottom of the cab. I am now on the third tap down from the top. My cab has from when I had a quick look between 6-9 rows of blocks of 6-8 taps I think. From looking at cab pictures on the Internet, before I saw inside mine, I thought they were all the same like 15, 18, 22 and 29 taps.

What do you think the technician will do to try and fix this intermittent fault? Like I have said knowing my luck, when the technician comes out everything will be stable.

Quote:

Originally Posted by General Maximus

Moving your tap point will bring your power levels back in spec for now but if there is noise on the network which gets fixed this week then your newly lowered tap point (depending on how low they have out you) may now take your power levels out of spec. The tech is correct in saying that if there was a problem a lot of customers would be ringing up complaining but they only know there is a problem when a tonne of calls get logged, it is circular reasoning. It takes a tech to come out to two or three of the same jobs in the same area to notice the fault and then he escalates it to networks to get fixed. Unfortunately not everyone is tech savvy and looks at their power levels to see what is wrong so these things don't always get picked up immediately.

---------- Post added at 21:22 ---------- Previous post was at 21:07 ----------

Power levels 21:22.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 5.9 dBmV 38.6 dB 5747 832
Locked 3 267000000 Hz 256 QAM 5.6 dBmV 38.3 dB 24128 772
Locked 4 275000000 Hz 256 QAM 5.6 dBmV 38.3 dB 2845 851
Locked 5 283000000 Hz 256 QAM 5.7 dBmV 37.9 dB 1707 784
Locked 6 291000000 Hz 256 QAM 5.7 dBmV 39.4 dB 1018 669
Locked 7 299000000 Hz 256 QAM 5.7 dBmV 39.4 dB 909 578
Locked 8 307000000 Hz 256 QAM 5.6 dBmV 39.4 dB 1020 702
Locked 10 323000000 Hz 256 QAM 6.2 dBmV 39.9 dB 1282 1025

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 42.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 41.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 22:20 ---------- Previous post was at 21:22 ----------

Power levels 22:20.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 3.9 dBmV 37.9 dB 5882 832
Locked 3 267000000 Hz 256 QAM 3.4 dBmV 37.1 dB 24843 772
Locked 4 275000000 Hz 256 QAM 3.5 dBmV 37.4 dB 2881 851
Locked 5 283000000 Hz 256 QAM 3.8 dBmV 37.4 dB 1734 784
Locked 6 291000000 Hz 256 QAM 3.7 dBmV 38.3 dB 1018 669
Locked 7 299000000 Hz 256 QAM 3.7 dBmV 38.3 dB 909 578
Locked 8 307000000 Hz 256 QAM 3.5 dBmV 38.3 dB 1020 702
Locked 10 323000000 Hz 256 QAM 4.3 dBmV 39.0 dB 1282 1025

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 45.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 44.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 22:23 ---------- Previous post was at 22:20 ----------

TiVo power level.

Return Power: 48dBmV
SNR: 41dB

---------- Post added at 22:25 ---------- Previous post was at 22:23 ----------

Power levels 22:25.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.0 dBmV 37.9 dB 5900 832
Locked 3 267000000 Hz 256 QAM 3.2 dBmV 37.1 dB 24950 772
Locked 4 275000000 Hz 256 QAM 3.5 dBmV 37.4 dB 2887 851
Locked 5 283000000 Hz 256 QAM 3.7 dBmV 37.4 dB 1737 784
Locked 6 291000000 Hz 256 QAM 3.6 dBmV 38.3 dB 1018 669
Locked 7 299000000 Hz 256 QAM 3.6 dBmV 38.3 dB 910 578
Locked 8 307000000 Hz 256 QAM 3.5 dBmV 38.3 dB 1020 702
Locked 10 323000000 Hz 256 QAM 4.3 dBmV 39.0 dB 1282 1025

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 50.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 49.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 22:26 ---------- Previous post was at 22:25 ----------

Power levels have been stable all day really, up until around this time. As you can see above the upstream power levels are starting to go up.

---------- Post added at 22:29 ---------- Previous post was at 22:26 ----------

TiVo power level.

Return Power: 50dBmV
SNR: 41dB

---------- Post added at 23:11 ---------- Previous post was at 22:29 ----------

Power levels 23:11.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.3 dBmV 38.3 dB 6276 1011
Locked 3 267000000 Hz 256 QAM 3.9 dBmV 37.4 dB 25886 990
Locked 4 275000000 Hz 256 QAM 4.0 dBmV 37.9 dB 3369 1184
Locked 5 283000000 Hz 256 QAM 4.1 dBmV 37.6 dB 2075 1038
Locked 6 291000000 Hz 256 QAM 4.0 dBmV 38.3 dB 1271 851
Locked 7 299000000 Hz 256 QAM 4.1 dBmV 38.3 dB 1193 748
Locked 8 307000000 Hz 256 QAM 3.9 dBmV 39.0 dB 1259 850
Locked 10 323000000 Hz 256 QAM 4.6 dBmV 39.0 dB 1570 1241

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 44.5 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 43.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

chambohambo · 16-08-2016, 09:11

Couple of hours earlier, one of my upstreams was on 32QAM, now it is back on 64QAM.

Can someone please tell me what causes noise on the upstream?

vm_tech · 16-08-2016, 12:38

Loose connectors

chambohambo · 16-08-2016, 14:09

Thanks for taking the time to respond to my post.

I have checked all connections and they are firmly tight.

---------- Post added at 14:23 ---------- Previous post was at 14:19 ----------

Power levels 14:23.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 5.4 dBmV 39.4 dB 1159 432
Locked 3 267000000 Hz 256 QAM 5.1 dBmV 38.3 dB 3386 379
Locked 4 275000000 Hz 256 QAM 5.1 dBmV 38.6 dB 781 417
Locked 5 283000000 Hz 256 QAM 5.2 dBmV 38.3 dB 540 348
Locked 6 291000000 Hz 256 QAM 5.2 dBmV 39.4 dB 475 353
Locked 7 299000000 Hz 256 QAM 5.2 dBmV 39.4 dB 511 379
Locked 8 307000000 Hz 256 QAM 5.1 dBmV 39.9 dB 659 508
Locked 10 323000000 Hz 256 QAM 5.7 dBmV 39.9 dB 490 360

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 43.0 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 42.3 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

---------- Post added at 14:26 ---------- Previous post was at 14:23 ----------

Virgin 1st line support are a complete waste of time. They were not going to book me a technician appointment as when I was on the phone to them, the power levels were stable, then out of the blue during the call, the upstream power level started going up.

---------- Post added at 15:09 ---------- Previous post was at 14:26 ----------

My BQM.

http://www.thinkbroadband.com/ping/s...0f02a4c1c.html

vm_tech · 16-08-2016, 16:36

I don't think it's anything to do with noise. Is it happening mainly during the day?

MUD_Wizard · 17-08-2016, 16:34

Quote:

Originally Posted by chambohambo

My BQM.

http://www.thinkbroadband.com/ping/s...0f02a4c1c.html

Can you provide the daily snapshot BQM's for each day from the 13th onwards?

chambohambo · 17-08-2016, 17:00

Quote:

Originally Posted by vm_tech

I don't think it's anything to do with noise. Is it happening mainly during the day?

Thanks for taking the time to respond to my post.

It can happen at any time really, but recently it has been happening in the evening.

---------- Post added at 17:52 ---------- Previous post was at 17:46 ----------

Quote:

Originally Posted by MUD_Wizard

Can you provide the daily snapshot BQM's for each day from the 13th onwards?

Thanks for taking the time to respond to my post.

As requested, 13th - today.

http://www.thinkbroadband.com/ping/s...3-08-2016.html

http://www.thinkbroadband.com/ping/s...4-08-2016.html

http://www.thinkbroadband.com/ping/s...5-08-2016.html

http://www.thinkbroadband.com/ping/s...6-08-2016.html

http://www.thinkbroadband.com/ping/s...7-08-2016.html

---------- Post added at 17:53 ---------- Previous post was at 17:52 ----------

What are the chances this problem is being caused by a faulty splitter or isolator?

---------- Post added at 18:00 ---------- Previous post was at 17:53 ----------

Power levels 18:00.

Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 4.6 dBmV 38.3 dB 7605 1577
Locked 3 267000000 Hz 256 QAM 4.4 dBmV 37.4 dB 28162 2112
Locked 4 275000000 Hz 256 QAM 4.3 dBmV 37.9 dB 4575 1537
Locked 5 283000000 Hz 256 QAM 4.5 dBmV 37.6 dB 3181 1454
Locked 6 291000000 Hz 256 QAM 4.5 dBmV 38.3 dB 2186 1118
Locked 7 299000000 Hz 256 QAM 4.5 dBmV 38.6 dB 2331 1194
Locked 8 307000000 Hz 256 QAM 4.3 dBmV 38.6 dB 2601 1306
Locked 10 323000000 Hz 256 QAM 5.0 dBmV 39.4 dB 3030 1895

Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 43.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 43.3 dBmV 64QAM 6400000 Hz 5120 Ksym/sec

vm_tech · 17-08-2016, 17:08

Your upstream seems to constantly be around the 43 mark which is fine, has your issue gone away now or is the upstream fluctuating?