Virgin upgrade works has messed up power levels

[madmanx]

Hi had some work on my local network done today as it says it was doing upgrade work to improve the services, 

But after being down for half the day when the hub came back online I saw the power levels are way out if sync now. The downstream before was between 0 and 3dbmv and the upstream dbmv was about 38 dmbv, now the downstream is +10 dbmv and the upstream is now around 34dbmv, do I need an engineer to fix it? I have a 6db forward path attenuater fitted at back of hub which i could change to a 10db forward path attenuator to bring down the downstream power levels but its the upstream I'm concerned about as its only 34dbmv?

Have I a problem now?

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Downstream bonded channels

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

1	138750000	9.8	38	256 qam	1
2	146750000	9.5	38	256 qam	2
3	154750000	9.5	38	256 qam	3
4	162750000	9.5	38	256 qam	4
5	170750000	9.6	38	256 qam	5
6	178750000	9.5	38	256 qam	6
7	186750000	9.5	38	256 qam	7
8	194750000	9.6	38	256 qam	8
9	202750000	9.6	38	256 qam	9
10	210750000	9.5	38	256 qam	10
11	218750000	9.6	38	256 qam	11
12	226750000	9.6	38	256 qam	12
13	234750000	9.8	38	256 qam	13
14	242750000	9.6	38	256 qam	14
15	250750000	9.8	38	256 qam	15
16	258750000	9.8	38	256 qam	16
17	266750000	10	38	256 qam	17
18	274750000	9.8	38	256 qam	18
19	282750000	9.8	38	256 qam	19
20	290750000	9.8	38	256 qam	20
21	298750000	10	38	256 qam	21
22	306750000	10	38	256 qam	22
23	314750000	10	38	256 qam	23
24	322750000	10.1	38	256 qam	24

Downstream bonded channels

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

1	Locked	38.9	6	0
2	Locked	38.6	6	0
3	Locked	38.6	6	0
4	Locked	38.9	5	0
5	Locked	38.6	7	0
6	Locked	38.6	5	0
7	Locked	38.6	18	0
8	Locked	38.9	15	0
9	Locked	38.9	5	0
10	Locked	38.9	6	0
11	Locked	38.6	4	0
12	Locked	38.9	7	0
13	Locked	38.9	5	0
14	Locked	38.9	5	0
15	Locked	38.9	4	0
16	Locked	38.6	5	0
17	Locked	38.6	6	0
18	Locked	38.6	4	0
19	Locked	38.9	5	0
20	Locked	38.9	6	0
21	Locked	38.6	6	0
22	Locked	38.9	5	0
23	Locked	38.9	5	0
24	Locked	38.9	5	0

[madmanx]

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Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	49600000	34.5	5120	64 qam	1
2	23600000	34	5120	16 qam	5
3	36600000	35.5	5120	16 qam	3
4	30100000	34	5120	64 qam	4
5	43100000	34.3	5120	64 qam	2

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0
5	ATDMA	0	0	0	0

[jb66]

What problem are you experiencing?

[madmanx]

Hi jb66 upstream is playing up,  the upstream modulation which was all at 64qam have dropped, are my power levels wrong now?

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Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	49600000	34.5	5120	64 qam	1
2	23600000	34	5120	16 qam	5
3	36600000	35.5	5120	16 qam	3
4	30100000	34	5120	64 qam	4
5	43100000	34.3	5120	64 qam	2

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0
5	ATDMA	0	0	0	0

[madmanx]

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Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	49600000	34.8	5120	64 qam	1
2	23599561	34	5120	16 qam	5
3	36600000	34.3	5120	32 qam	3
4	30100000	34.2	5120	16 qam	4
5	43100000	34.3	5120	32 qam	2

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0
5	ATDMA	0	0	0	0

[unisoft]

If you have rebooted and checked all connections are tight (blah blah) then you'll need a tech visit as your QAM levels are wrong on 4 upstream channels. They should all be 64QAM on a normal connection. Whilst they can work at lower levels, it normally means less bandwidth. The other figures are fine though unless you start having around 29db on upstream.

[Client62]

You can try the 10dB attenuator to see if that improves ( lowers ) the downstream power figures. You can even try both attenuators ... but look carefully at the outcome, -7 to +7 dBmV is the preferred range.

The upstream, remember the direction, this power level is showing how strongly the VM Hub is transmitting to the street cabinet. The real concern here is the channels are not all holding at QAM 64, suggesting there is an SNR issue in the locality. As the power levels are not high, the issue may be affecting everyone local to you.

[madmanx]

Hi I put the 10db forward path attenuator on and took the 6db one off but straight away I noticed that videos were freezing/lagging so I put the 6db one back on again, but now power levels are going over 10dbmv again, what do I do now? Can virgin send me a 10db attenuator or should I request an engineer to adjust the power levels in the cabinet? Also upstream levels were all at 64qam but now are playing up again, so much for upgrading our service.

[madmanx]

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Downstream bonded channels

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

1	202750000	9	38	256 qam	9
2	210750000	9	38	256 qam	10
3	218750000	9.1	38	256 qam	11
4	226750000	9.3	38	256 qam	12
5	234750000	9.3	38	256 qam	13
6	242750000	9.1	38	256 qam	14
7	250750000	9.3	38	256 qam	15
8	258750000	9.4	38	256 qam	16
9	266750000	9.5	38	256 qam	17
10	274750000	9.5	38	256 qam	18
11	282750000	9.5	38	256 qam	19
12	290750000	9.5	38	256 qam	20
13	298750000	9.9	38	256 qam	21
14	306750000	9.6	38	256 qam	22
15	314750000	9.9	38	256 qam	23
16	322750000	10	38	256 qam	24
17	330750000	10.3	38	256 qam	25
18	338750000	10.4	38	256 qam	26
19	346750000	10.3	38	256 qam	27
20	354750000	10.1	38	256 qam	28
21	362750000	10.1	38	256 qam	29
22	370750000	10.3	38	256 qam	30
23	378750000	10.1	38	256 qam	31
24	386750000	10	38	256 qam	32

Downstream bonded channels

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

1	Locked	38.9	5	0
2	Locked	38.9	9	0
3	Locked	38.6	7	0
4	Locked	38.6	13	0
5	Locked	38.9	9	0
6	Locked	38.6	8	0
7	Locked	38.9	11	0
8	Locked	38.6	11	0
9	Locked	38.9	10	0
10	Locked	38.9	9	0
11	Locked	38.6	10	0
12	Locked	38.9	12	0
13	Locked	38.9	14	0
14	Locked	38.6	7	0
15	Locked	38.6	7	0
16	Locked	38.9	11	0
17	Locked	38.9	7	0
18	Locked	38.9	9	0
19	Locked	38.9	9	0
20	Locked	38.6	11	0
21	Locked	38.9	9	0
22	Locked	38.9	6	0
23	Locked	38.6	9	0
24	Locked	38.9	19	0

[madmanx]

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Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	49599926	36.5	5120	64 qam	1
2	36600054	36.3	5120	64 qam	3
3	30100000	36	5120	64 qam	4
4	43100073	36.5	5120	64 qam	2
5	23600005	36	5120	32 qam	5

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0
5	ATDMA	0	0	3	0