In twisted pair cable network powering, what is the first connection step?

The correct choice involves wiring the twisted pair power cables to the NIU (Network Interface Unit) power terminals first. This step is critical because it establishes the initial connection necessary for any subsequent functionality of the network. By connecting the power cables to the NIU, you are ensuring that the unit has the necessary power to operate effectively before additional connections are made.

This initial step also sets the foundation for a reliable power source, which is essential for the overall integrity and performance of the twisted pair cable network. Ensuring that power is connected effectively to the NIU helps prevent issues that could arise later in the setup process, such as power loss or connectivity problems.

The other options do not represent the logical first step in the power connection process, as they either focus on secondary actions or considerations that should take place after power has been established at the NIU.