In other Linden houses, the ORANGE coax line is from Spectrum.
XFinity used black coax.
So the Spectrum line goes to the ground block; extends to the splitter via a white coax, and then to 4 room wall jacks. If you subscribe to XFinity, and try to find the room jack on that splitter for their modem, you will not succeed.
The XFinity line is harder to identify. It might be the unterminated coax on the bottom left. Or it might come thru the bottom next to the orange line and connected to one of the lines wrapped into the circle at the top right.
In either case, it is NOT grounded. That is a risk during lightning strikes.
With coax, unused connections on a splitter need a terminating resistor. If you are only connecting to a modem (not to any cable TV boxes) then you do not need the splitter. Connect the modem room coax line directly to the ground block. Connect the incoming data coax line also to the ground block. Done.
Identifying the correct coax from the room can be done in 2 ways.
Use a signal injector and tracer.
Or trial and error - connect one coax at a time, and see if the modem locks onto a signal after a few minutes. That fails if the right coax line is without a connector.
One final thing... Many houses of that age have what look like ethernet jacks in the rooms. They are not. Those are wires for old style dial-up telephone service. That is what the junction block in the top left is for. Plugging in ethernet cables to these jacks will not work. There might be zero signal or a bad signal. To get them to work, need new terminations at both ends, and a network switch in the garage cabinet.
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