由下行埠 (downstream facing port, dfp,或稱source)發送第一個source_capabilities訊號;此訊號包含電源資料目標 (power data objects, pdo),表. 進行pd溝通時,與dp aux溝通一樣會區分上接端以及下接端,在pd分別稱之為dfp (downstream facing port)以及ufp (upstream facing port),並且由dfp主導溝通流.
Chief Judge Jack Tuter Swears In Broward Clerk of Courts Brenda D