Chapter 2 Technology Overview; Osi Model; Table 2-1. Seven-Layer Osi Model - ADTRAN ATLAS User Manual

Chapter 2

OSI MODEL

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Technology Overview
This chapter discusses the OSI Model, Frame Relay Protocol, and Transpar-
ent Bit Oriented Protocol (TBOP).
The Open Systems Interconnection (OSI) model is 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 2-1 describes these layers.
Layer Title
Layer 7 Application
Layer 6 Presentation Provides transparent communication by creating
Layer 5 Session
Layer 4 Transport
Layer 3 Network
Layer 2 Data Link
Layer 1 Physical
ATLAS Frame Relay User Manual

Table 2-1. Seven-Layer OSI Model

Description
Contains functions for end-user services. These
include FTP , remote file access, and network
management. This is not the application, but the
interface.
code and syntax compatibility between systems.
Takes care of the communication facility
provided by the transport layer (layer 4). Allows
sessions to be established, recovered, and
terminated.
Provides some error correction and end-to-end
flow control. Also decides best route for the
information being transmitted.
Determines the method for transmitting data and
also deals with routing the data between
networks. Moves data based on addressing.
Deals with procedures and protocols for
controlling the transmission line. Provides some
error detection and correction.
Deals with the electrical, mechanical, and
functional control of sending data over the
transmission lines.
2-1