High Downstream Levels...
 

Hello Chaps,
A question mainly out of morbid curiosity, really!

Receive levels look pretty high on my modem, was thinking it may be worth popping a FPAttenuator on (got a few 3 and 6dB ones lying around at work). Had a drop of 1dB since the warmer weather by the look of it.

The most recent engineer put me on a higher tap in the cabinet, but that was due to poor upstream levels apparently. Seems to have upped my downstream by 4dB - Anything over 10db rx sounds rather hot, no?

U/S is running at a super-stable 35dbmv (on both 16QAM channels :rolleyes:), so no real issues there IMO.

https://www.cableforum.uk/images/local/2018/04/13.png

Thanks,
Tom

Re: High Downstream Levels...
 

IMO a high downstream has no effect on the connection but no harm putting a 6db attenuator on

Re: High Downstream Levels...
 

JB is right provided that, as is your case, SNR levels are high (the RxMer value). Of course if the power level is too high, then other effects can occur at the tuner. But not till around 15dBmv.

Re: High Downstream Levels...
 

Roger that. Thanks chaps.
Looks healthier now.

(Seen your signal guides over at the VM Forum before BTW, Seph - Nicely done) :tu:


Tom

Re: High Downstream Levels...
 

ya, that is a million times better than what you had before. They should be as close to 0 as possible. Out of curiosity (for you) I would keep an eye on those upstream power levels because whilst you won't notice any performance increase or decrease, afaik your upstream channels should be on qam64 and you don't want to let the power drop below 32. The only time mine drop back down to 32 or 16 is when there is noise on the line.

Re: High Downstream Levels...
 

I think it's just old infrastructure locally - Never seen anything other than 16QAM and two channels. Did used to get the full complement of (24?) D/S channels on the Hub3, mind. :)

~41dbmv for the U/S is alright isn't it?
...I don't discount noise ingress around here, though. Some shocking installs.


Tom

Re: High Downstream Levels...
 

yup, I have always been around the 42-45 mark.