General : Which look better?

[chambohambo]

Hi,

I am asking for a friend.

Which looks better, the before or after?

Thanks for looking at my post and I’ll look forward to the responses.

——-
(Before) Virgin Media maintenance work.
04/06/2018

Downstream bonded channels
Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 299000000 -2 40.3 256 qam 17
2 323000000 -3 40.3 256 qam 20
3 315000000 -2.5 40.3 256 qam 19
4 307000000 -2.5 40.3 256 qam 18
5 291000000 -2 40.3 256 qam 16
6 283000000 -2 40.3 256 qam 15
7 275000000 -1.5 40.9 256 qam 14
8 267000000 -1.5 40.3 256 qam 13
9 259000000 -1.4 40.3 256 qam 12
10 251000000 -1 40.3 256 qam 11
11 243000000 -0.7 40.3 256 qam 10
12 235000000 -0.4 40.9 256 qam 9
13 227000000 0 40.9 256 qam 8
14 219000000 0.2 40.3 256 qam 7
15 211000000 0.5 40.9 256 qam 6
16 203000000 0.9 40.9 256 qam 5
17 195000000 1.2 40.9 256 qam 4
18 187000000 1.5 40.9 256 qam 3
19 179000000 1.9 40.9 256 qam 2
20 171000000 2 40.9 256 qam 1

Upstream bonded channels
Channel ID Frequency(Hz) Mode Power
(dBmV) Modulation Channel Bandwidth(Hz) Symbol Rate (ksps)
5 39400000 ATDMA 44.5 16 qam 6400000 5120
4 46200000 ATDMA 44.5 16 qam 6400000 5120

——-
(After) Virgin Media maintenance work.
05/06/2018

Downstream bonded channels
Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 299000000 2 36.6 256 qam 17
2 323000000 1.2 36.3 256 qam 20
3 315000000 1.5 36.6 256 qam 19
4 307000000 1.5 36.3 256 qam 18
5 291000000 2.5 36.6 256 qam 16
6 283000000 2.4 36.6 256 qam 15
7 275000000 2.7 37.3 256 qam 14
8 267000000 2.7 37.3 256 qam 13
9 259000000 2.7 37.3 256 qam 12
10 251000000 3.2 37.6 256 qam 11
11 243000000 3.5 37.3 256 qam 10
12 235000000 4 37.6 256 qam 9
13 227000000 4.5 37.6 256 qam 8
14 219000000 4.8 38.6 256 qam 7
15 211000000 5 38.6 256 qam 6
16 203000000 5.4 38.6 256 qam 5
17 195000000 6 38.6 256 qam 4
18 187000000 6.6 38.9 256 qam 3
19 179000000 6.9 38.6 256 qam 2
20 171000000 7 38.9 256 qam 1

Upstream bonded channels
Channel ID Frequency(Hz) Mode Power
(dBmV) Modulation Channel Bandwidth(Hz) Symbol Rate (ksps)
5 39400000 ATDMA 36.8 16 qam 6400000 5120
4 46200000 ATDMA 36.8 16 qam 6400000 5120

[Matth]

I think the general rule is... Don't get too hung up on them if it's working.
The levels up a touch, the SNR down a touch.

Just looked at mine, all around the -4 and 37.


If I recall, the target level is 0dB +/- 3, +/- 6 no great issue.

Since I have a 3dB forward path attenuator on mine, I'll remove it after checking a few more times.

[General Maximus]

the target on the downstream is as close to 0 as possible and -7 to +10 is acceptable. Bearing that in mind I would prefer the before because the after is too close for comfort. The upstream on the before is also perfect. Mine has been 45 for over a decade.

[chambohambo]

Hi,

Thanks for taking the time to read and respond to my post.

Originally Posted by Matth

I think the general rule is... Don't get too hung up on them if it's working.
The levels up a touch, the SNR down a touch.

Just looked at mine, all around the -4 and 37.


If I recall, the target level is 0dB +/- 3, +/- 6 no great issue.

Since I have a 3dB forward path attenuator on mine, I'll remove it after checking a few more times.

---------- Post added at 09:17 ---------- Previous post was at 09:17 ----------

Hi,

Thanks for taking the time to read and respond to my post.

Originally Posted by General Maximus

the target on the downstream is as close to 0 as possible and -7 to +10 is acceptable. Bearing that in mind I would prefer the before because the after is too close for comfort. The upstream on the before is also perfect. Mine has been 45 for over a decade.

[Aye Up]

Do these variances really have an impact on speed or QoS though?

[General Maximus]

As long as they are within spec no, the trick is keeping them that way. I would rather have a ds channel on -3 than +7.

[SnoopZ]

Originally Posted by General Maximus

As long as they are within spec no, the trick is keeping them that way. I would rather have a ds channel on -3 than +7.

Mine go from 0 to +10 always spread across the 24 channels, been told it is ok but I would prefer if they are even across the range.

[General Maximus]

my range is -0.2 to +3.2 which I think is absolutely excellent

[JordanTheToaster]

Mines +0.7 to +1.9 on DS.

[Martin_D]

Our range: