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lewis-brooks
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Acceptable Power Level (dBmV) and RxMER (dB)

What are the normal thresholds for dBmV and dB?

My dBmV levels range from 1.7 to 3.5 for my downstream channels which seems a bit odd. I also had thousands of PreRS and PostRS errors yesterday before I rebooted the box

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

1299000000238256 qam17
23230000001.738256 qam20
33150000001.738256 qam19
4307000000238256 qam18
52910000001.938256 qam16
6283000000238256 qam15
7275000000238256 qam14
82670000002.238256 qam13
92590000002.238256 qam12
102510000002.538256 qam11
112430000002.238256 qam10
122350000002.538256 qam9
132270000002.738256 qam8
142190000002.738256 qam7
15211000000338256 qam6
16203000000338256 qam5
171950000003.238256 qam4
181870000003.538256 qam3
191790000003.538256 qam2
201710000003.538256 qam1



Downstream bonded channels

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

1Locked38.990
2Locked38.6290
3Locked38.6230
4Locked38.6210
5Locked38.680
6Locked38.6400
7Locked38.960
8Locked38.930
9Locked38.980
10Locked38.960
11Locked38.990
12Locked38.950
13Locked38.670
14Locked38.960
15Locked38.6140
16Locked38.950
17Locked38.970
18Locked38.990
19Locked38.960
20Locked38.930

Just another VM user trying to help out so my answers may be wrong.
If you do like my answer please mark it as helpful; it may help others
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Very Insightful Person
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Re: Acceptable Power Level (dBmV) and RxMER (dB)

Try

THIS

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Forum Team (Retired) Jen_A
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Re: Acceptable Power Level (dBmV) and RxMER (dB)

Hi lewis-brooks,

In addition to Kippies link the rule of thumb for power levels is:

Downstream: no lower than -6dBmV and no higher than 10dBmV - Close to 0 is optimal.

Upstream: no lower than 31dBmV and no higher than 50dBmV - 44dBmV -46dBmV is optimal.

Some Hubs function perfectly well even when the power levels are slightly out of kilter so we like to take the power levels in context with any reported issue and other data.

What problems are you having with your connection?


Jen
Forum Team



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Harty2018
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Re: Acceptable Power Level (dBmV) and RxMER (dB)

Upstream  US-1 US-2 US-3 US-4
Channel Type2.02.02.02.0
Channel ID1342
Frequency (Hz)46200000326000002580000039400000
Ranging StatusSuccessSuccessSuccessSuccess
Modulation16QAM16QAM16QAM16QAM
Symbol Rate (Sym/sec)5120000512000051200005120000
Mini-Slot Size2222
Power Level (dBmV)51.2550.7550.2150.75
T1 Timeouts0000
T2 Timeouts0000
T3 Timeouts0010
T4 Timeouts0000
 Hi, 
Can I ask if the upsteam power levels above are within normal range please as I am getting a little slow page loading speeds this may be my machine but just need to be sure as I only got my internet back after a 5 day outage on 5th due to a cable fault SNR issue. (upsteam lvls above downstream below)
 
Thanks in advance 
 
Stewart 
 
Power Level (dBmV)6.877.047.057.207.287.257.197.11
All answers are advice and you heed my advise at your own risk
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DaveM
Problem sorter
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Message 5 of 5
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Re: Acceptable Power Level (dBmV) and RxMER (dB)

Upstream levels are a little high but if it's working OK no need to bother.

Keep an eye on it and if they rise post back.

Dave

"The late great Douglas Adams: A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."
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