[ Internet ] { flow: north } -- [ VLAN Switch ]
[ Host machine ] -- [ VLAN Switch ]
[ Host machine ] { flow: south } -- [ USB Hub ]
[ RockPro64 ] { flow: north } -- [ VLAN Switch ]
[ USB Hub ] -- [ Power Controler ]
[ USB Hub ] -- [ Serial adapter ]
[ Serial adapter ] -- [ RockPro64 ]
[ Power Controler ] -- [ 12V PS ]
[ Power Controler ] { flow: east } -- [ RockPro64 ]