[ 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 ]