2 x coaxial plugs in my box, what is that?

one comes and goes in waves I guess it is, but I thought that only connected devices to be affected by power outages. Why matter inputs and outpus: and you have to use all means?

It is by power surges. If lightning struck a power line and cable was connected to that line, then a wave would go through the coaxial cable and damage the case television or cable. The input of your cable (from wall) must enter the "in" and then a new cable "a" goes to your cable box (or directly to the TV if you have a box.

Updated Coax cable RG6 stripping and crimping tutorial

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