Power Levels

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

(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.??

upstream is 42.25. So I need to log a fault then. What would the effect of having such high power levels?

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!

ok, thanks. I will take a trip to town next weekend then to pop into Maplin.

Ian

Remember to get the "Forward" Type attenuators or else it will mess up your upstream signal..

Have Maplin stopped selling these as can't find them on their website?

Ian

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.

Ebay sell them..

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

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.

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