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Jim Henderson wrote:
> On Mon, 17 May 2010 12:15:13 -0700, Darren New wrote:
>
>> Jim Henderson wrote:
>>> What do you mean by "2-way broadcast"?
>> Well, FM radio would be a one-way broadcast. Coax ethernet would be a
>> two-way broadcast.
>
> OIC what you're saying, that the filtering is applied by the receiving
> end (either filtered by software or hardware).
Right.
>> Well, look, there really isn't something that's a multicast physical
>> layer.
>
> Maybe Sirius radio? Dunno, you might be right on that.
Different frequencies, sure. I'd more likely call that lots of independent
networks.
> Would have to find someone who works for a cableco to confirm,
> obviously. (Or a good article describing the technology)
Yeah.
>>> all people who are watching channel 657 are likely part of a multicast
>>> group of some sort,
>> Sure. And all people watching channel 657 are also receiving channel
>> 652. They're just not tuning it. Just like FM radio. (And I was talking
>> about IP over cable, actually, not TV per se. :-)
>
> That implies a pretty enormous total bandwidth on the coax cable coming
> into your house, then. If you figure 40 SD channels and 40 HD channels,
> for example, that several megabits of digital broadcast being sent out to
> be filtered.
Yep. A cable can carry huge amounts of data, depending on its length. The
closer the fiber hubs out to the houses, the more channels you can carry.
> I was using cable TV as an example because it's data being sent over a
> network. Data is data is data is data, after all. :-)
Exactly.
--
Darren New, San Diego CA, USA (PST)
Ada - the programming language trying to avoid
you literally shooting yourself in the foot.
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