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OSI Overview

303535-A Rev 00

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Table 1-1. OSI Reference Model and Common ISO Standards

OSI Network Organization

An OSI network is made up of end systems and intermediate systems (routers)

that are organized hierarchically.

• End systems originate and receive data. They do not perform any routing

services. Examples of end systems on a network include workstations, file

servers, and printers.

Application Layer

Presentation Layer

Session Layer

Transport Layer

Network Layer

Data Link Layer

Physical Layer

8571 File Transfer and Access Management (FTAM)

8649 OSI Association Control Service Element (ACSE)

9040 Virtual Terminal Protocol (VT)

8822 OSI connection-oriented and connectionless presentation services

8824 Abstract Syntax Notation One (ASN.1)

9576 OSI connectionless protocol to provide connectionless service

8326 Session service definitions

8327 Session layer protocols

8072 Transport service definition, both connection and connectionless

8073 Transport connection-oriented protocol definition

8602 Transport definition for connectionless-mode protocol

8473 Connectionless-mode network service

9542 End System to Intermediate System routing exchange protocol

10589 Intermediate System to Intermediate System routing exchange protocol

8802 Local area network standards (mostly derived from IEEE standards)

8471 HDLC balanced, link address information

8886 Data link service definition for OSI

9314 Fiber Distributed Data Interface (FDDI)

9543 Synchronous transmission quality at DTE/DCE interface

9578 Communications connectors used in LANs

OSI0001A

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