ADTRAN ATLAS 550 Bedienungsanleitung PDF herunterladen (Seite 213)

61200305L1-1 ATLAS 550 User Manual B-1

Appendix B

OSI Model and Frame Relay

Technology Overview

This chapter discusses the OSI Model, Frame Relay Protocol, and Transpar-

ent Bit Oriented Protocol (TBOP).

OSI MODEL

The OpenSystems Interconnection (OSI) modelis an internationally accept-

ed standard for communication between multiple vendors’ communication

equipment. It relies on a seven-layer model to allow communication be-

tween communication equipment. Table B-1 describes these layers.

Bydefiningstandardinterfacesbetweeneachofthesevenlayers,anindivid-

uallayer onlyhasto knowaboutthe interfaceto thelayerabove,to the layer

below, and tothe samelayeron theotherend ofthe network.Thisinterface

definition simplifies the process of networking.

Table B-1. Seven-Layer OSI Model

Layer Title Description

Layer 7 Application Contains functions for end-user services. These include FTP, remote file

access, and network management. This is not the application, but the

interface.

Layer 6 Presentation Provides transparent communication by creating code and syntax

compatibility between systems.

Layer 5 Session Takes care of the communication facility provided by the transport layer

(layer 4). Allows sessions to be established, recovered, and terminated.

Layer 4 Transport Provides some error correction and end-to-end flow control. Also decides

best route for the information being transmitted.

Layer 3 Network Determines the method for transmitting data and also deals with routing

the data between networks. Moves data based on addressing.

Layer 2 Data Link Deals with procedures and protocols for controlling the transmission line.

Provides some error detection and correction.

Layer 1 Physical Deals with the electrical, mechanical, and functional control of sending

data over the transmission lines.

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ADTRAN ATLAS 550 Bedienungsanleitung Seite 213