If you disconnect all the cables so that none of them are connected to anything... 

you can short out the cables in the rooms one at a time and then use an OHM meter to look for the cable that is shorted.i used this to determine which cable went to which room. 

Or

Put a small DC voltage (like with a 9-volt battery) on a cable and then go to the other end and look for which one has 9 volts on it.

Since you are looking for the input I guess use process of elimination.

-------- Original message --------
From: Keith Wright via WLUG <wlug@lists.wlug.org>
Date: 9/7/23 14:21 (GMT-05:00)
To: Worcester Linux Users' Group General Discussion <wlug@lists.wlug.org>
Cc: wlug@lists.wlug.org, kstratton@fastmail.us, Keith Wright <kwright@keithdiane.us>
Subject: [WLUG] Re: I need advice on a new ISP

Kevin Stratton via WLUG <wlug@lists.wlug.org> writes:

> I am not sure how helpful this is, The Comcast technician that
> installed my cable modem insisted that all the splitters be removed

It might be very helpful.  It explains why there are coax cables
hanging out of the walls all over the house and more hanging from
the basement ceiling, but almost none are connected at all.

Somebody thought it would be a good idea to put a TV in every room,
but it didn't work.

> If you can find a cable that leaves the house, that is the cable you
> should be most interested in.

It's difficult to trace cables; they are all inside the walls,
but I find one that comes out of the wall and goes into the
the bottom of a small metal box.  The front of the box has 8
coax connectors, but only one has a cable.  That cable goes
through the ceiling and out of the wall upstairs behind a
big shelf that looks like a place to put a TV.

I have a DSL splitter, which has the outside line going in
and two outputs, one is voice the other digital.  I think
that by "splitter"  you don't mean that, but just a passive
one-to-many connector, with output just copies of the input,
like a power strip.  That's what the metal box looks like.

   -- Keith
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