Avaya Configuring ATM Services Bedienungsanleitung Seite 6

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Seitenansicht 5
vi
117374-A Rev. A
Chapter 2
Understanding ATM Concepts
ATM General Information ................................................................................................2-1
ATM Cells .................................................................................................................2-1
Cell Headers ......................................................................................................2-2
The Cell Information Field .................................................................................2-3
Data Transmission ....................................................................................................2-3
Permanent and Switched Virtual Connections .........................................................2-5
Physical Layer ................................................................................................................2-5
ATM Layer .......................................................................................................................2-6
ATM Adaptation Layer (AAL5) ........................................................................................2-7
Service Records and Virtual Circuits ..............................................................................2-8
Data Encapsulation ........................................................................................................2-9
Encapsulation Methods ............................................................................................2-9
LANE Encapsulation ..........................................................................................2-9
LLC/SNAP Encapsulation ................................................................................2-10
NULL Encapsulation ........................................................................................2-10
NLPID Encapsulation ......................................................................................2-10
Selecting a Data Encapsulation Method ................................................................2-11
Selecting LLC/SNAP Encapsulation ................................................................2-11
Selecting NULL Encapsulation (VC-Based Multiplexing) ................................2-11
Encapsulation Rules for PVCs ...............................................................................2-12
PVC Access Methods ...................................................................................................2-13
Multiple PVCs .........................................................................................................2-13
One PVC ................................................................................................................2-15
Hybrid Access ........................................................................................................2-16
Using Hybrid PVCs for Transparent Bridging .........................................................2-17
SVC Access Methods ...................................................................................................2-18
ATM Traffic Parameters .................................................................................................2-18
Variable Bit Rate Versus Available Bit Rate ..................................................................2-19
Variable Bit Rate ....................................................................................................2-19
Available Bit Rate ...................................................................................................2-20
Rules for Editing Protocols ...........................................................................................2-20
ARP and Inverse ARP Support ....................................................................................2-21
ATM Error Checking .....................................................................................................2-21
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