New entrance terminal and new underground cable to a new building on campus. Are the protection modules in the terminal direction sensitive? Does it matter which side of the terminal the UG cable goes to? I think I know but would like to hear it from someone else to confirm.

I should be protecting the pbx, so the inside cable to the switch should be on the output of the terminal? And the UG on the input.
And do the same at the other end of the UG, so the UG is always on the input, and the equipment and phones to protect are always on the output side.

Thank you.
Jim