Low power level

[royaltiger]

Having had 50mb just installed, up and downloads seem ok but downstream power level is lower than recommended on the sticky, should I leave it or have it tweaked.

Cable Modem DownstreamDownload Failed (1) DS-1DS-2DS-3DS-4Frequency298750000306750000314750000322750000Lock Status
(QAM Lock/FEC Sync/MPEG Lock)Y/Y/YY/Y/YY/Y/YY/Y/YChannel Id1234Modulation256QAM256QAM256QAM256QAMSymbol Rate
(Msym/sec)6.9526.9526.9526.952Interleave DepthI=12
J=17I=12
J=17I=12
J=17I=12
J=17Power Level
(dBmV)8.368.338.148.08RxMER
(dB)37.3637.6437.9438.26Correctable
Codewords12312913983Uncorrectable
Codewords280272417923Download Failed (1)

[pip08456]

Having had 50mb just installed, up and downloads seem ok but downstream power level is lower than recommended on the sticky, should I leave it or have it tweaked.

Cable Modem DownstreamDownload Failed (1) DS-1DS-2DS-3DS-4Frequency298750000306750000314750000322750000Lock Status
(QAM Lock/FEC Sync/MPEG Lock)Y/Y/YY/Y/YY/Y/YY/Y/YChannel Id1234Modulation256QAM256QAM256QAM256QAMSymbol Rate
(Msym/sec)6.9526.9526.9526.952Interleave DepthI=12
J=17I=12
J=17I=12
J=17I=12
J=17Power Level
(dBmV)8.368.338.148.08RxMER
(dB)37.3637.6437.9438.26Correctable
Codewords12312913983Uncorrectable
Codewords280272417923Download Failed (1)



dBmV 8.36 8.33 8.14 8.08 is high
RxMER is OK

So what part of the sticky says there levels are too low?

You still need the D/s power levels correcting though.

Here is a Sticky for 50Mb power levels across all platforms

Downstream

* Knowsley networks using QAM64 are: -7 to +3 dBmV.

* Knowsley networks using QAM256 are: -3 to +7 dBmV.

* Langley & Bromley networks using QAM64 are: -10 to 0 dBmV.

* Langley & Bromley networks using QAM256 are: -4 to +6 dBmV.


Upstream

* Upstream signal levels (from the modem) should be between 34 and
55dBmV.
__________________

I t would also help if you posted your stats like this to make them easier to read

Cable Modem Downstream
DS-1 DS-2 DS-3 DS-4
Frequency 299000000 307000000 315000000 323000000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 5 6 7 8
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 6.952 6.952 6.952 6.952
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17
Power Level
(dBmV) -5.20 -5.25 -5.45 -4.76
RxMER
(dB) 35.60 35.97 36.17 36.61
Correctable
Codewords 379 125 82 12
Uncorrectable
Codewords 276 911 245 244

I find if I copy and paste into note pad then copy and paste from there to the forum it works OK.

[royaltiger]

Downstream SNR: Minimums are 24.5dB on the Langley platform and 26dB on the Bromley platform. Again these aren't the minimums required to function but when you're down this low you're teetering on the brink of losing your service.

Downstream Receive Power: Ideally +/- 3dBmV, cause for concern at around +/- 8dBmV,
---------- Post added at 17:22 ---------- Previous post was at 17:18 ----------

Am I reading the wrong part

[pip08456]

Yes you are. SNR is shown a RxMER on the 50Mb modem stats so yours being between 37.36 and 38.26 across the streams is quite good.

Your receive power levels (dBmV) being above 8 is not good.

[royaltiger]

OK thanks thats fine, also I did paste the stats straight from the page and it looked perfect on the thread but obviously went wrong when it was sent.

[pip08456]

Happened to me when I first posted and was given the same tip I've given you. Worked fine since then. ( I think it could be that that stats page is a web page).

One thing to check as I couldn't really decypher it is the correctable/uncorrectable codewords are looking on the high side as well which could point to a connection problem.

Can you repost your u/stream d/stream stats in a readable form?

[Peter_]

Cable Modem DownstreamDownload Failed (1)
-Power Level (dBmV) 8.36 8.33 8.14 8.08
RxMER (dB) 37.36 37.64 37.94 38.26Download Failed (1)
Perfectly legible when you know what you are looking at.;):D

Downstream receive power on the high side and may need an engineer.

Call the 50Mb Support Line on 0800 052 0431

Your Upstream power levels would be of interest.

[Ignitionnet]

Having had 50mb just installed, up and downloads seem ok but downstream power level is lower than recommended on the sticky, should I leave it or have it tweaked.

If it's working as intended it's fine, no point in worrying.

[pip08456]

Perfectly legible when you know what you are looking at.;):D

Downstream receive power on the high side and may need an engineer.

Call the 50Mb Support Line on 0800 052 0431 begin_of_the_skype_highlighting**************0800 052 0431******end_of_the_skype_highlighting

Your Upstream power levels would be of interest.

Masque, you smarty pants:D

I knew what I was looking at! RxMER OK dBmV at +8 too high!

Igni whereas I agree if it's working it is not too much of a worry I would think that D/s level is an accident waiting to happen, so get it sorted sooner rather than later.

[royaltiger]

Cable Modem Upstream

US-1 US-2 US-3 US-4
Channel Type 1.0 N/A N/A N/A
Channel ID 3 N/A N/A N/A
Frequency
(Hz) 42800000 N/A N/A N/A
Ranging Status Success N/A N/A N/A
Modulation 16QAM N/A N/A N/A
Symbol Rate
(KSym/sec) 2560 N/A N/A N/A
Mini-Slot Size 2 N/A N/A N/A
Power Level
(dBmV) 28.75 N/A N/A N/A
T1 Timeouts 0
T2 Timeouts 0 0 0 0
T3 Timeouts 4 0 0 0
T4 Timeouts 0 0 0 0
tried copying and pasting to notepad but not made a difference so not sure why it does not appear like you see it.

[Peter_]

Cable Modem Upstream


Power Level
(dBmV) 28.75 .
Way to low and you need an engineer.

[pip08456]

Cable Modem Upstream

US-1 US-2 US-3 US-4
Channel Type 1.0 N/A N/A N/A
Channel ID 3 N/A N/A N/A
Frequency
(Hz) 42800000 N/A N/A N/A
Ranging Status Success N/A N/A N/A
Modulation 16QAM N/A N/A N/A
Symbol Rate
(KSym/sec) 2560 N/A N/A N/A
Mini-Slot Size 2 N/A N/A N/A
Power Level
(dBmV) 28.75 N/A N/A N/A
T1 Timeouts 0
T2 Timeouts 0 0 0 0
T3 Timeouts 4 0 0 0
T4 Timeouts 0 0 0 0
tried copying and pasting to notepad but not made a difference so not sure why it does not appear like you see it.

This appears perfectly, As Masque said, youneed an engineer to sort out the levels.