Network Layer Concepts - Atm & Atm Adaptation; The Layered Network Architecture - Avaya M-ACCF/SF User Manual

Network Layer Concepts — ATM & ATM Adaptation
This Section describes the following concepts behind the network layer architecture
of a typical ATM network:
•

The Layered Network Architecture

• ATM Adaptation Layer (AAL)
• Asynchronous Transfer Mode (ATM) Layer
• Physical Layer
The Layered Network Architecture
Asynchronous Transfer Mode (ATM) is one part of the layered network architecture.
This architecture is shown in Figure 1.8.
Each of the layers is discussed in turn; starting with the Upper Layer and working
down to the Physical Layer.
Figure 1.8
Key
PDUs
Avaya M770 M-ACCF/SF ATM Access Modules User's Guide
Network Layer Architecture
ULP PDUs
LAN Em ulation
Frames
AAL5 PDUs
A TM Cells
SONET or SDH
frames
m edia
Logical flow
Physical flow
Protocol Data Units
Chapter 1 Overview
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