Correct signal & power levels?
 

Hi there!

I jus wanted to ask if my levels are within the correct spec?
I used to know them off by heart but since the Shubs, I havent got a clue anymore.

I am in the PE3 area of Peterborough, am on 350Mb (was 300Mb homeworks) and I have the original white Shub 3.0.

Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 282750000 -7.5 38 256 qam 19
2 322750000 -7 38 256 qam 24
3 314750000 -7.2 38 256 qam 23
4 306750000 -7 38 256 qam 22
5 298750000 -7.2 38 256 qam 21
6 290750000 -7.5 38 256 qam 20
7 274750000 -7.5 38 256 qam 18
8 266750000 -7.4 38 256 qam 17
9 258750000 -7.5 38 256 qam 16
10 250750000 -7.5 38 256 qam 15
11 242750000 -7.7 38 256 qam 14
12 234750000 -7.5 38 256 qam 13
13 226750000 -7.5 38 256 qam 12
14 218750000 -7.7 38 256 qam 11
15 210750000 -7.7 38 256 qam 10
16 202750000 -7.7 38 256 qam 9
17 194750000 -7.7 38 256 qam 8
18 186750000 -7.7 38 256 qam 7
19 178750000 -7.7 38 256 qam 6
20 170750000 -7.9 38 256 qam 5
21 162750000 -7.7 38 256 qam 4
22 154750000 -8 38 256 qam 3
23 146750000 -8.2 38 256 qam 2
24 138750000 -8.5 37 256 qam 1


Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 38.9 12 0
2 Locked 38.9 8 0
3 Locked 38.9 6 0
4 Locked 38.6 5 0
5 Locked 38.6 9 0
6 Locked 38.6 11 0
7 Locked 38.6 11 0
8 Locked 38.6 9 0
9 Locked 38.9 5 0
10 Locked 38.6 8 0
11 Locked 38.6 6 0
12 Locked 38.6 7 0
13 Locked 38.6 7 0
14 Locked 38.6 6 0
15 Locked 38.6 19 0
16 Locked 38.9 21 0
17 Locked 38.9 6 0
18 Locked 38.9 11 0
19 Locked 38.9 20 0
20 Locked 38.6 40 0
21 Locked 38.9 19 0
22 Locked 38.6 6 0
23 Locked 38.6 7 0
24 Locked 37.3 7 0


Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 25800000 42 5120 64 qam 4
2 32600000 43.5 5120 64 qam 3


Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 1 0
2 ATDMA 0 0 1 0

Thanks all in advance :-)

Re: Correct signal & power levels?
 

I believe the downstream power levels are meant to be between -6 to +10 dBmv, so yours are low. Do you have an attenuator on the back of the Hub? If so, take it off. If not, you'll need an engineer out to adjust it at the cab.

The upsteam power level is in spec.

Re: Correct signal & power levels?
 

Yes, I have a 10dB FPA, i shall swap it out for the 6dB FPA I have and then see what my levels are like.

Are the upstream levels ok?

Thanks for your reply :)

Re: Correct signal & power levels?
 

Yep, upstream is fine. Anything below 50dBmv is good, not sure if there is a lower limit but yours are in spec.

This thread by Sephiroth is quite useful, if you want some light reading :)

Re: Correct signal & power levels?
 

I would remove the fpa , you don't need one

Re: Correct signal & power levels?
 

Correct.

Re: Correct signal & power levels?
 

On the subject of power levels I've noticed something strange with mine.
The levels vary greatly between channels.
They range fro - 3.9 to + 6 between the 20 channels.
Is this normal. SH3 in ode mode
Attachment 27382

Attachment 27383

Re: Correct signal & power levels?
 

Check the security of the connectors. Large variations on different frequencies can be due to the connection being improperly terminated.

Re: Correct signal & power levels?
 

Thanks heero.
I did have a splitter on for the V6.
I have taken that off and fed the cable direct to router but it was still the same.
Put a new connector on the cable but still the same.
I will have a look in the brown box outside.

Re: Correct signal & power levels?
 

I thought there was normally a slope on the power levels?

Re: Correct signal & power levels?
 

Quite right. The downsatream is incorrectlyu sloped and SNR (as represented by RxMER) is poor on some channels.

Re: Correct signal & power levels?
 

I presume I have a bad connection/cable somewhere or does this need a call out?

Re: Correct signal & power levels?
 

Imo, yes. Others in your locality should also be experiencing difficulty.

Re: Correct signal & power levels?
 

Thanks Seph. Will report back on the outcome.