On Mon, 14 Oct 2013 23:37:25 -0400 Jerry Stuckle <jstuc...@attglobal.net> wrote:
> No, a cable modem does both MOdulation and DEModulation - which is > why it is called a MODEM. > > On the internet, input/output on one side of the modem is digital, > through an RJ-45 to category cable. > > But you can only have one digital signal on a wire. On the other > side of the modem is 75 ohm coax cable. You *could* run the digital > signal on this cable for a few hundred feet (some systems claim up to > around 1500 feet), but this signal would not be compatible with the > other signals (standard and hi-def TV and possibly music channels). > As a side note, multiple hi-def TV signals, even though they are all > digital, would not be able to share the same cable as digital > signals, either. > > Therefore, all these signals (including your internet) are modulated > onto analog RF signals. Each signal has its own band, or range of RF > frequencies it uses (a signal is not a single frequency). And coming > the other way, the signal from the cable must be demodulated to > convert it back to digital. > > The cable company has another cable modem on the other end of the > line to convert the signals between analog and digital, also. > > So, you can see, a cable modem truly is a modem. Right you are. I stand corrected. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20131015110005.6dd05e8b@zareason-limbo5880