"Other posters have given you reasonable suggestions for identifying
cables. But I'm wondering why it matters as long as each outlet is
the same signal from the same source -- the splitter. "
Interesting you should ask (and, btw, you seem to be the first to do
so...). Anyway, a little off topic, but the reason for the question is
this: the cable company's feed starts from the attic and is being split
into various rooms as I described. What I would like to do is intall in
the attic an HTDV over-the-air antenna and feed the signal from that to
an HDTV in one of the rooms.
I don't want to run a new cable from the attic thru the second floor to
the first floor (where the HDTV is located); I just don't have the
skills (and probably tools) required for that kind of job. So, in my
infinite wisdom, I figured that if I can determine which cable goes to
the room in question, I'll just disconnect it from the splitter and
connect it to the OTA HDTV antenna in the attic (using a coax coupler)
and to the HDTV in the room and voila! OTA HDTV reception.
I understand that by doing that I give up regular cable reception in
that room but (1) it's a problem for another day and (2) it's not
really much of a problem anyway since I don't intend to user that for
the usual cable fare.
So that's the reason....