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-   -   50M : Post RS Errors (https://www.cableforum.uk/board/showthread.php?t=33699810)

mmm 14-04-2015 00:22
Re: Post RS Errors
 
Is the only way VM change the power still by physical tap change and attenuators? Mine so good for the last couple of years after new kit fitted in the street cab I assumed they were able to actively control downstream at 0dB?

Code:
Downstream
        DS-1        DS-2        DS-3        DS-4        DS-5        DS-6        DS-7        DS-8
Frequency (Hz)        442250000 Hz        450250000 Hz        458250000 Hz        466250000 Hz        474250000 Hz        482250000 Hz        490250000 Hz        498250000 Hz
Lock Status(QAM Lock/FEC Sync/MPEG Lock)        Locked        Locked        Locked        Locked        Locked        Locked        Locked        Locked
Channel ID        5        6        7        8        9        10        11        12
Modulation        QAM256        QAM256        QAM256        QAM256        QAM256        QAM256        QAM256        QAM256
Symbol Rate (Msym/sec)        6.952000        6.952000        6.952000        6.952000        6.952000        6.952000        6.952000        6.952000
Interleave Depth        I=12
J=17        I=12
J=17        I=12
J=17        I=12
J=17        I=12
J=17        I=12
J=17        I=12
J=17        I=12
J=17
Power Level (dBmV)        0.1 dBmV        0.5 dBmV        0.7 dBmV        0.6 dBmV        0.2 dBmV        0.2 dBmV        0.5 dBmV        0.3 dBmV
RxMER (dB)        39.9 dB        39.9 dB        39.5 dB        39.4 dB        39.4 dB        39.1 dB        39.0 dB        38.6 dB


Upstream
        US-1        US-2        US-3        US-4
Channel Type        2.0        2.0        N/A        N/A
Channel ID        20        19        N/A        N/A
Frequency (Hz)        25800000 Hz        32600000 Hz        N/A        N/A
Ranging Status        Success        Success        N/A        N/A
Modulation        QAM16        QAM16        N/A        N/A
Symbol Rate (Sym/sec)        5120000        5120000        N/A        N/A
Mini-Slot Size        128        128        N/A        N/A
Power Level (dBmV)        37.0 dBmV        37.5 dBmV        N/A        N/A
T1 Timeouts        0        0        N/A        N/A
T2 Timeouts        0        0        N/A        N/A
T3 Timeouts        0        0        N/A        N/A
T4 Timeouts        0        0        N/A        N/A
SHUB1 so no rs errors

Hope they can do same to yours Jon22

Jon22 14-04-2015 01:45
Re: Post RS Errors
 
I've got some FPA's somewhere, not sure if I have a 6dB though. So, I'll stick one of those on once everything is sorted.

Sephiroth 14-04-2015 08:29
Re: Post RS Errors
 
They should have seen it and be trying to find the source. What's going on in your VM Forum thread on this?

Jon22 14-04-2015 11:25
Re: Post RS Errors
 
Quote:
Originally Posted by Sephiroth (Post 35771450)
They should have seen it and be trying to find the source. What's going on in your VM Forum thread on this?

I've resorted to PMing one of the team, seem to get a faster response that way. The person couldn't see that any fault reference had been raised though but did say it could of been a bit too early for it.

Upstream power level has dropped overnight, downstream SNR is still low.

Upstream
US-1 US-2 US-3 US-4
Channel Type 2.0 N/A N/A 2.0
Channel ID 50 N/A N/A 49
Frequency (Hz) 39400000 N/A N/A 46200000
Ranging Status Success N/A N/A Success
Modulation 16QAM N/A N/A 16QAM
Symbol Rate (Sym/sec) 5120000 N/A N/A 5120000
Mini-Slot Size 4 N/A N/A 4
Power Level (dBmV) 43.75 N/A N/A 43.96
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 2 0 0 5
T4 Timeouts 0 0 0 0

Downstream
DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 299000000 267000000 275000000 283000000 291000000 307000000 315000000 323000000
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked Locked Locked
Channel ID 13 9 10 11 12 14 15 16
Modulation 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17
Power Level (dBmV) 8.29 7.92 7.78 7.92 8.15 8.81 8.88 9.07
RxMER (dB) 33.38 33.16 33.16 33.16 33.60 33.72 33.72 33.72
Pre RS Errors 1220703 9651255 11868496 5900224 1630301 13744573 621134 704209
Post RS Errors 140510 82871 109604 117715

Just had another call from the tech, he reckoned it should be sorted within the next week or so.

qasdfdsaq 14-04-2015 13:04
Re: Post RS Errors
 
Quote:
Originally Posted by mmm (Post 35771434)
Is the only way VM change the power still by physical tap change and attenuators?
For individual customers, yes.

Quote:
Mine so good for the last couple of years after new kit fitted in the street cab I assumed they were able to actively control downstream at 0dB?
It can only be controlled on a per-channel-per-node basis. Changing it would affect every customer connected to that shared channel, which could be thousands.

---------- Post added at 12:04 ---------- Previous post was at 12:03 ----------

Quote:
Originally Posted by Sephiroth (Post 35771450)
They should have seen it and be trying to find the source. What's going on in your VM Forum thread on this?
Given the location of the problem is upstream from his cab, it probably needs second level (Networks?) to look at it. Ordinary techs can't deal with stuff that far up AFAIK.

Jon22 14-04-2015 13:20
Re: Post RS Errors
 
Quote:
Originally Posted by qasdfdsaq (Post 35771498)
Given the location of the problem is upstream from his cab, it probably needs second level (Networks?) to look at it. Ordinary techs can't deal with stuff that far up AFAIK.
Yeah that's what the tech told me yesterday. He deals with problems from the house to the cab, anything else is passed on to networks.

Jon22 14-04-2015 19:19
Re: Post RS Errors
 
Looks as though some work has been done this afternoon.

DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 299000000 267000000 275000000 283000000 291000000 307000000 315000000 323000000
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked Locked Locked
Channel ID 13 9 10 11 12 14 15 16
Modulation 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17
Power Level (dBmV) 11.25 10.61 10.50 10.78 11.08 11.65 11.68 11.85
RxMER (dB) 35.97 35.78 35.42 35.78 36.17 36.17 36.17 36.17
Pre RS Errors 1364411 9842024 12172551 6105944 1787834 13892642 777371 867447
Post RS Errors 190192 106279 134757 148091 245359 343382 278423 282756

General Maximus 14-04-2015 19:24
Re: Post RS Errors
 
Quote:
Originally Posted by Jon22 (Post 35771625)
Looks as though some work has been done this afternoon.
not really, it has got worse. You downstream power has gone up and it needs to go way down.

Jon22 14-04-2015 19:26
Re: Post RS Errors
 
Quote:
Originally Posted by General Maximus (Post 35771626)
not really, it has got worse. You downstream power has gone up and it needs to go way down.
Well at least the SNR has improved... :p:

heero_yuy 14-04-2015 19:28
Re: Post RS Errors
 
Quote:
Originally Posted by General Maximus (Post 35771626)
not really, it has got worse. You downstream power has gone up and it needs to go way down.
Well the RxMER picked up a bit but the DS power's getting too high. If the OP's got some FPA's now's the time deploy some before he looses connectivity.

qasdfdsaq 14-04-2015 19:33
Re: Post RS Errors
 
Quote:
Originally Posted by General Maximus (Post 35771626)
not really, it has got worse. You downstream power has gone up and it needs to go way down.
At least this time it's gone up without a concomitant increase in noise.

I suppose that's one way to find the source of the noise, if you're lazy. Turn the power up at each accessible point on the line to see which change increases power without increasing noise.

Jon22 14-04-2015 19:34
Re: Post RS Errors
 
Quote:
Originally Posted by heero_yuy (Post 35771628)
Well the RxMER picked up a bit but the DS power's getting too high. If the OP's got some FPA's now's the time deploy some before he looses connectivity.
10 dB be ok? I've got a 6dB coming if not. Although I don't know if there's any more work being done.

Sephiroth 14-04-2015 19:37
Re: Post RS Errors
 
Either would be fine. Just keep an eye on the levels and adjust accordingly.

heero_yuy 14-04-2015 19:38
Re: Post RS Errors
 
Quote:
Originally Posted by Jon22 (Post 35771633)
10 dB be ok? I've got a 6dB coming if not.
10db should do a treat but as they're obviously still mucking about keep an eye on the levels. Once they identify the noisy node the levels could fluctuate as they apply the fix. Whatever that might be.:erm:

mmm 15-04-2015 09:58
Re: Post RS Errors
 
Quote:
Originally Posted by qasdfdsaq (Post 35771632)
At least this time it's gone up without a concomitant increase in noise.

I suppose that's one way to find the source of the noise, if you're lazy. Turn the power up at each accessible point on the line to see which change increases power without increasing noise.
It could be a box swap? But based on your previous reply to me DS power will have gone up for lots of others too - so I doubt they are finished yet!


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