OSI/ISO Lingo: Interfaces and Services

SDU

• IDU = Interface Data Unit = ICI + SDU

• ICI = Interface Control Information

• SDU = Service Data Unit

• PDU = Protocol Data Unit = Fragments of SDU + Headeror Several SDUs + Header (blocking)

• SAP = Service Access Point

ICI

SDU

IDU

SDU

ICI

Header

PDU

SAP

ICI

SDU

IDU

SDU

ICI

SAP

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