Avaya M-ACCF/SF manual ATM Adaptation Layer AAL, Asynchronous Transfer Mode ATM Layer, ATM Basics

Page 32

Chapter 1

Overview

 

 

ATM Adaptation Layer (AAL)

Ethernet frames can be between 64 and 1514 bytes in length. ATM transmits data in fixed length cells. Each cell contains 48 bytes of user data. The ATM Adaptation Layer (AAL) converts data between the Ethernet and ATM formats.

The AAL has a Segmentation and Reassembly (SAR) sub-layer that does the conversion.

In the sending device the LEC passes the Ethernet frames to the SAR. The SAR converts the user data into fixed length cells, and passes these cells to the ATM Layer for transmission across the ATM network.

In the receiving device, the SAR converts the ATM cells back into the appropriate user data again, and passes this data to the LEC.

As ATM can carry different traffic types (for example, voice, video, and other data), several Adaptation Layer protocols have been defined. These protocols operate simultaneously within the Adaptation Layer, and allow the ATM Layer to support different applications and traffic types.

Note: The M-ACC module uses the AAL5 ATM Adaptation Layer protocol, which is a data-oriented protocol. The ATM access module will only work with other devices using the AAL5 ATM adaptation layer protocol.

Asynchronous Transfer Mode (ATM) Layer

Asynchronous Transfer Mode (ATM) is a connection-oriented transmission protocol that has the following features:

•ATM uses the Signalling Protocol (Q.2931) to dynamically create, maintain and clear ATM connections between end-systems.

•ATM uses fixed length packets known as cells, and each cell identifies the connection to be used.

•ATM is transparent to the multiple services it supports and can carry cells from different applications over the same physical connection.

•ATM has well-defined user and network interfaces.

ATM Basics

Asynchronous Transfer Mode (ATM) technology transfers network traffic, including voice, video, and data, at high speed. Using this connection-oriented networking technology, centered by a switch, you can set up a great number of virtual connections to support multiple applications through the same physical connection. The switching technology enables dedicated bandwidth for each application, overcoming the problems that exist in a shared-media networking technology, like Ethernet, Token Ring, and FDDI. ATM allows different types of

16

Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide

Page 31 Page 33
Image 32
Page 31 Page 33
Contents ACCF/SF Module Page Introduction ATM TerminologyFinding Information in This Guide Conventions Page Contents Contents Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide Iii Contents Contents Page Management Submenu List of FiguresPort Submenu Display Results Snmp Submenu ATM SubmenuList of Tables Page ATM Access Modules Features and BenefitsOverview ATM BenefitsAvaya M770 Frame Switch Domains ATM Access Module FeaturesWire Rate Transmission on ATM port LAN Emulation Lane versionNetwork Layer Concepts LAN Emulation LAN Emulation OverviewEmulated LAN Components LAN Emulation Client LECBroadcast and Unknown Server BUS LAN Emulation Configuration Server LecsLAN Emulation Server LES Emulated LAN Connections Control VCCsData VCCs Frame Ordering Flush ProtocolConnecting a LEC to an Elan Operation of the LAN EmulationConnection Processes of the LEC to Lane Server RegistrationLAN Emulation Components in Your Network Address ResolutionConnection Management LAN Emulation and Avaya Devices An ExampleJoining the Elan LEC must know the name of the Elan it is to joinLocating the Lecs Mapping Ethernet and ATM AddressesAddress Resolution If the destination MAC address is listed in the ARP TableWhat Happens to Broadcast and Multicast Frames? LAN Emulation Address Resolution Protocol LearpWhat Happens to Unicast Frames? Network Layer Concepts ATM & ATM Adaptation Layered Network ArchitectureATM Basics Asynchronous Transfer Mode ATM LayerATM Adaptation Layer AAL ATM is Service Transparent Service ProcessingATM is Connection-Oriented 10 Communication Channels11 Connection Terminology Virtual Path Identifier VPI Virtual Channel Identifier VCI12 Switching Cells Using VPI and VCI Values Switched Virtual Circuits SVCsATM Interfaces Interim Local Management Interface IlmiATM Layer and Cell Structure ATM Address RegistrationNetworkhostidentifier 15 ATM Cell Structure Physical Layer Extending VLANs into the ATM Network16 Vlan to Elan Mapping 17 Extending VLANs into the ATM Network Planning Your Network ApplicationsPutting Your ATM Network Together ATM Configuration Rules Does your network conform to the ATM configuration rules?What logical network domains, VLANs, do you wish to set up? Are the LAN Emulation services configured correctly?Extending VLANs Through the ATM Network Will you have sufficient Elan resources?ATM Connections Within Your Network Network Configuration Examples ATM Backbone in the BuildingATM Backbone in the Building Avaya M770 Multitechnology Functionality Avaya M770 Multitechnology FunctionalityRouting in the X-Switch Domain Routing in the X-Switch DomainSafety Information InstallationInstalling the M-ACC Module Pre-installation Procedure Single-mode Module Laser ClassificationMulti-Mode Module LED Warning Agency ApprovalBudget Calculation Examples Domain Usage ConsiderationsAvaya M770 Module DRU Budget DRU Budget Information Window DRU Budget Information WindowInstalling the Module Connecting a Cable to the ATM Port Inserting the Module into the HubRemoving an Existing ATM Access Module Power On Self TestCAM Contents Addressable Memory tests Post-Installation Checks M-ACC LEDs DescriptionsConfiguring the M-ACC Module ACC Module Default SettingsM-ACC Module Default Settings Connecting to the Serial PortEstablishing a Telnet Session For example telnetSetting up the M-ACC Module To connect to the M-SPX/S Console portAssigning the M-ACC module IP address, Gateway and Netmask Module Setup Main MenuATM IP Configuration There is no need to perform a reset. Configuration Example Setting up the ATM Access ModuleAccmmls Switch MLS BridgingSwitch CLI & ATM Terminal Interface Switch Command Line Interface CLIACC ATM Access Module Terminal Menu Interface IntroductionConventions Used Switch Command Line Interface CLI Commands Summary TableReset the Module Software Download to the X-Switch CPU Entering Software Download ParametersStarting the Software Download Process Monitoring the Software Download ProcessCreate Report Set Defaults to Factory SettingsSet Primary Version Configuration Copy Clear Mac Address TableAssigning the M-ACC module IP address, Gateway and Netmask Commands Tree Chart Logging OnSubmenus Managing the ATM Access ModuleLogging Off Menu Structure of the ATM Access Module System Menu Configuring System ParametersMain Menu Options Passwords Submenu 1,3 Reset Submenu1,4Display Submenu 1,1 Initialize Submenu 1,2Operational Meanings of Display Flash Log Submenu Items System Logger Submenu 1,5Display Flash Log Messages Submenu 1,5,1 Display Memory Log Messages Submenu 1,5,2 Operational Meanings of Display Memory Submenu ItemsSystem Software Download Submenu 1,6 Configuring an ATM PortATM access module Configuration Port Submenu 2,1 Operational Meanings of Port Submenu ItemsATM Port Physical Submenu 2,1,6 VCC Submenu 2,2VCC Submenu Items and their Operational Meanings Aging Submenu 2,2,4IP Submenu 3,1 Administering IP and Snmp ManagementSnmp Configuration Submenu 3,2 Configure Submenu Items and their Operational Meanings 18 updSysAtt Submenu 3,2,6 VN Configuration Menu 20 Virtual net SubmenuVlan Vlan Elan IDElan LEC ATMLEC LES ATMSetting up an ATM VLAN/ELAN Upgrading SoftwarePreliminaries DownloadingMonitoring the ATM Access Module ATM Port Statistics22 ATM Port Statistics Screen Port Statistics Display Items and their MeaningsVCC Statistics Statistics Display Items and their MeaningsCajun LANEMaster version Network Management and MonitoringCajunView M770 Device Manager version CajunView M770 Device Manager Starting the M770 ManagerRunning M770 Manager from HP-OV for Windows Running M770 Manager from HP Windows NTStarting Cajun LANEMaster LANEMasterOverview Cajun LANEMaster Views OverviewCajun LANEMaster Window Page Specifications ACC ATM Access Module Technical SpecificationsEnvironmental, Safety, and EMC Specifications ATM Cable SpecificationTable A.3 Standard Multi-mode Cable Specifications Optical Standard SupportedATM Forum SDH Standard SupportedTable A.4 Standard Multi-mode Cable Specifications EIA-492CAAASafety Information Important Safety InformationELAN/VLAN TroubleshootingTable B.1 Troubleshooting Tips Page Index NumericsATM WAN SARText Learp LuniLES ATM VLAN/ELANVCC Emea Europe, Middle East and Africa Region How to Contact UsUnited States UAE AP Asia Pacific Region Avaya.com
Top Page Image Contents