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Standard User mrblobby
(knowledge is power) Fri 26-Nov-10 22:47:46
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Power Levels


[link to this post]
 
Should I be worried with these power levels?

Cable Modem Downstream
DS-1 DS-2 DS-3 DS-4
Frequency 298750000 306750000 314750000 322750000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 101 102 103 104
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 6.952 6.952 6.952 6.952
Power Level
(dBmV) 15.45 15.12 14.40 14.86
RxMER
(dB) 38.61 38.61 38.61 38.98
Correctable
Codewords 38 24 25 32
Uncorrectable
Codewords 929 279 968 944
Standard User djfunkdup
(committed) Sat 27-Nov-10 00:10:41
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Re: Power Levels


[re: mrblobby] [link to this post]
 
(dBmV) 15.45 15.12 14.40 14.86
RxMER

yea they are too high 10.00 is the max they should be

mine:
Power Level
(dBmV) 6.81 5.99 5.71 5.84

mine are slightly higher than they were a few mnths ago...but from what iv read they can increase slightly in the cold/winter time..

but yours are defo on the high side......the rest of your downstream stats look ok..

what is your upstream power level.??

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Standard User mrblobby
(knowledge is power) Sat 27-Nov-10 08:40:07
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Re: Power Levels


[re: djfunkdup] [link to this post]
 
upstream is 42.25. So I need to log a fault then. What would the effect of having such high power levels?


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Standard User pete_thomson
(fountain of knowledge) Sat 27-Nov-10 20:36:59
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Re: Power Levels


[re: mrblobby] [link to this post]
 
It's very much too high - get a call logged or pop to Maplin and buy some F-type attenuators. I bought a set of -3, 6 and -10dB for about 4 quid.

Personally I'd pop a 10 and 3dB on there as VM recommend -3dBmv to +7dBvm.

So at 13dBvm it'll be getting 4x the signal it would like, 16dBvm it's getting 8x the signal!

Virgin Media 50Mb/s
50.56Mb/s - 1.63Mb/s - 26ms @ 04/12/2009
http://www.speedtest.net/result/641806789.png
Standard User mrblobby
(knowledge is power) Sun 28-Nov-10 08:15:04
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Re: Power Levels


[re: pete_thomson] [link to this post]
 
ok, thanks. I will take a trip to town next weekend then to pop into Maplin.

Ian
Standard User olisun
(fountain of knowledge) Sun 28-Nov-10 08:51:45
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Re: Power Levels


[re: mrblobby] [link to this post]
 
Remember to get the "Forward" Type attenuators or else it will mess up your upstream signal..
Standard User mrblobby
(knowledge is power) Mon 29-Nov-10 09:45:08
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Re: Power Levels


[re: olisun] [link to this post]
 
Have Maplin stopped selling these as can't find them on their website?

Ian
Standard User pete_thomson
(fountain of knowledge) Mon 29-Nov-10 17:07:30
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Re: Power Levels


[re: mrblobby] [link to this post]
 
Looks like they have.

A quick google shows plenty of place selling similar, including 0-20dB variable ones.
Not sure if they are forward attenuators or not, but if they are makes them quite handy.

Virgin Media 50Mb/s
50.56Mb/s - 1.63Mb/s - 26ms @ 04/12/2009
http://www.speedtest.net/result/641806789.png
Standard User JimKirk363
(fountain of knowledge) Tue 30-Nov-10 01:49:38
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Re: Power Levels


[re: olisun] [link to this post]
 
Ebay sell them..

http://shop.ebay.co.uk/?_from=R40&_trksid=p5197.m570...

Athlon 64 6000+ AM2 X2, ASUS M2N-SLI Deluxe 570 NForce Mainboard, 4GB DDR 2 XMS2 800Mhz Cosair Ram, 3856.46GB Hard Disk Space, 1GB ATI 4670 HD PCI-E 16x Graphics, 700watt PSU.

Ex AOL Dialup 56k Customer....
Ex Freedom2Surf 512k and Ex Eclipse Internet 2mb Customer.

Virgin Media 50mb Cable

Virgin Media R EVIL!!!
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Standard User Suspishio
(newbie) Wed 29-Dec-10 00:12:52
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Re: Power Levels


[re: mrblobby] [link to this post]
 
In reply to a post by mrblobby:
upstream is 42.25. So I need to log a fault then. What would the effect of having such high power levels?

The effects of high downstream are (a) amplified noise - bad when your SNR/RxMER is <35 dB on 256QAM modulation; (b) Signal intrusion on the adjacent channel which corrupts data.

Upstream (if stable) was fine as I'm sure you know.

Suspishio

My advice is at your risk.

Edited by Suspishio (Wed 29-Dec-10 00:13:51)

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