Ongoing transfers New transfer requests \----\ | | | v v +-------------+ +---------------+ | ALTO Client | <===========> | Data Transfer | +-------------+ | Scheduler | ^ | ^ | PV Request +---------------+ | | | \--------------\ | | \--------------\ | | v PV Response | v +-------------+ +-------------+ | ALTO Server | | ALTO Server | +-------------+ +-------------+ || || +---------+ +---------+ | Network | | Network | | Manager | | Manager | +---------+ +---------+ . . . _~_ __ . . . . ( )( ) .___ ~v~v~ /--( )------------( ) ( )-----/ ( ) ( ) ~w~w~ ~^~^~^~ ~v~v~ Site 1 Non-blocking Core Site 2