Running both internet- and TV-signals on coaxial?

Running both internet- and TV-signals on coaxial?

I have a 1) Zyxel P-2812HNU-Fx for a) home network+internet and b)
landline and a 2) satellite/FTA reciever for TV.
There's already a decent coaxial network going from the utility room and
to all rooms in the house. There are also two seperate ethernet wires
(we'll call them ethernet A and ethernet B) going from the utility room to
the living room. So that's a total of three networks, where the coaxial is
the only one going to all rooms.
Now, we only have one TV and one phone (placed in the living room), but we
have several computers.
I'm thinking about setting it up like this:
Landline: Copperwire from street --> Zyxel P-2812HNU-Fx --> Landline by
ethernet A --> Phone
Internet: Copperwire from street --> Zyxel P-2812HNU-Fx --> Some RJ45 to
coaxial adapter --> Coaxial network --> Several computers
TV: Satellite reciever --> Coaxial network --> TV
For this, I will be needing a 1) RJ45 to coaxial adapter and 2) something
to input two coaxial wires and output one (a coaxial splitter?). And now
for the questions: 1) Is this possible (running ethernet and TV on same
coaxial)? 2) What do I need?