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