 KickrootJava HeathenPremium
join:2002-11-24
Glassboro, NJ | reply to vic102482
Re: just an answer is needed I'm not following what you're trying to say, so let me explain. The cable modem needs two ranges of frequencies for communication with the headend - one for upstream, and one for downstream.
Upstream is always within the 5-42MHz range. That's for all devices on the cable networks, not just the modems. Set top boxes also use this for the upstream.
Downstream in the cable plant is 54MHz and above. All your TV channels and the modem downstream use this. For the most part the analog channels will go from 54 ~ 400MHz. Above 400MHz, it's all digital. The cable modem downstream will fall somewhere in the digital range.
So basically, the cable tech can install a notch filter, that blocks out everything from 54-400MHz. This means all the analog channels are blocked. Digital channels still pass through with no problem, but since you aren't a TV subscriber (and thus have no digital box) you still can't view these channels.
Now the cable modem can communicate freely, and you don't get to watch cable TV.
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