One cable connects to the hub, power it one, there will be a connection to the network, some updates will be done and it will work. If you have TV connect the other cable (via the IEC connector) to the TV box and connect the box to the hub with an Ethernet cable. That's pretty much most people have to do unless there is a fault.
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Hub 3.0, TP-Link Archer C8, TP-Link TL-SG108S 8-port gigabit switch, V6