Quote:
Originally Posted by Sephiroth
There's a reasoned explanation of attenuation between street cabinet and cable modem here.
How far are you from the street cabinet? There are attenuation points of 12, 15, 18 & 22 dB (if my memory serves me correctly) from which an engineer can choose for your case. So the highest leaving the tap point would be c. 30 dBmv (see the article) and then the losses on the way. |
I will have a go at estimating the distance and get back to you. must be about 100 metres total cable length give or take a few metres by the time you go from the brown box to the pavement, then down the street to the pit, then accross the road from the pit to the green cabinet which is in line. Might actually be less, which is why they arent giving me the RG11, but with the 2 splitters, 3 boxes and modem plus the signal drop on the cable alone its pushing my signal too weak.
if there is a 22 dB attenuation point, surely it shouldnt end up at -6 dBmV
I know I have 2 splitters on the line, the 4 way with 3 outputs, and a further 3 way with 2 outputs connected to one of the ways on the 4 way.
but ok, deduct 6 dBmV roughly for those splitters but surely on a 22 dB attenuation point I should be getting a better signal than that.
I had a look at the link posted on the VM website you referenced.
It does clearly say,
QAM256 -3 dBmv to +7 dBmv
So why is the 100mbit team telling me they wont argue with the engineers verdict, that -6 dBmV is fine, and the engineer saying he wouldnt be worried unless it is -7 dBmV? is this some kind of lack of traning or knowledge or something?
---------- Post added at 13:34 ---------- Previous post was at 13:32 ----------
Quote:
Originally Posted by jb66
Did you mention an HDU if they refused RG11? That will boost your downstream by 6db as they would remove the 3 way spitter and if they wired it properly removing the 2 way splitter you'd actually gain 10db
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Yep, he wasnt interested.. just kept saying signal levels are fine, as they are above -7 dBmV and that i wont have problems unless it drops to - 7.1 dBmV
lol, the amount of hastle this is creating, just to get it fixed it makes you wonder if its easier to just open up the pit one night when nobody is around and have a go moving yourself onto another tap... even though im sure thats highly illegal so i wont be doing that.