PDU (Protocol Data Unit) refers to the other unit of data passed between layers. Physical layer protocol data unit PDU is the data bits, data link layer PDU is a data frame, the network layer PDU is the data packet, the transport layer of the PDU is the data segment, the other higher-level PDU is the data.
Source Destination Source Destination PDU 1 PDU 1 PDU 1 PDU 1 PDU 2 PDU 2 PDU 2 PDU 3 PDU 3 Time PDU 3 PDU 3 × PDU 4 PDU 4 PDU 4 Garbled frame PDU 5 PDU 5 PDU 5 PDU 5 (a) Error-free transmission (b) Transmission with losses and errors Figure 8.16 Model of PDU Transmission
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