What is SDU and PDU?

Answer 1

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.

Answer 2

PDU is something like information which delivered through the network layer.For the network to understand what layer is being disscussed,a single letter prefixed is added to the PDU.Like-

A. LPDU-Communication for the Datalink Layer

B. NPDU-Communication for the Network Layer

C. TPDU-Communication for the Transport Layer

Abhishek Khare

Answer 3

In networking, PDU means "protocol data unit", and it is the generic name of the "packets" of data used at different levels of the network. Using the numbering of the OSI layers:

At layer 2, the PDUs are called "frame". Example: An Ethernet frame, a frame-relay frame.

At layer 3, the PDUs are called "packets". Example: An IP packet.

At layer 4, the PDUs are called "segments". Example: A TCP segment, a UDP segment.