Controller
The heart of a network. Placing it creates a network that belongs to you; every device within 16 blocks on each axis can join it. It also stores the network's energy (100,000 FE).
BlockNetworkMinecraft 1.21.1 · NeoForge 21.1
How to get it
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ControllerQuantum Storage
How to use it
Place it: it creates a network and you are its owner. The network covers a cube of 16 blocks on each axis around the controller.
Right-click it to open its screen: the status (online, no energy), the energy it uses and how long it can last, the disks it sees, and the list of devices in the network. Sneak and right-click for a short status above your hotbar.
Breaking the controller removes its network: devices that were linked to it stop working.
Terminal