[ Internet ] { flow: north } -- [ PoE/VLAN Switch ]
[ Host machine ] -- [ PoE/VLAN Switch ]
[ Host machine ] { flow: south } -- [ USB Hub ]
[ PoE Splitter ] { flow: north } -- [ PoE/VLAN Switch ]
[ RockPro64 ] -- { label: "Network" } [ PoE Splitter ]
[ RockPro64 ] -- { label: "Power" } [ PoE Splitter ]
[ USB Hub ] -- [ Serial adapter ]
[ Serial adapter ] { flow: south; } -- [ RockPro64 ]