What is SDU and PDU?

The terms SDU as well as MDU are used in the context of Broadband connections, and more specifically in the context of Fiber Optics networks.

SDU stands for Single Dwelling Unit, and MDU stands for Multi Dwelling Unit.

When analysing or designing Fiber Optics networks of a technology FTTx (Fiber-To-The-x, e.g. FTTH: Fiber-To-The-Home, FTTB: Fiber-To-The-Building etc.) one needs to know where the fiber optic cable ends: at the basement of a building or inside a house or appartment. The cabling and equipment requirements to connect a single home (SDU) are different than those used to connect all the appartments in a multi-level building (MDU). Hence the need for distinction between the dwelling types of the end users of fiber optic connections.

PDU stands for Power Distribution Unit. This is used inside data centers.