開放 かいほう がたシステム かん相互 そうご接続 せつぞくだったら
kaihōgata shisutemukansō gosetsuzokudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 開放型システム間相互接続

1. If it were an open systems interconnection…; If it had been an open systems interconnection…

Tara Conditional
Computing