Avaya Configuring ATM and MPLS Services Instrukcja Użytkownika Pobierz pdf (Strona 37)

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Understanding ATM, MPOA, ATM Router Redundancy, and OAM

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The following layers relate directly to how Bay Networks routers support ATM:

• Physical layer

•ATM layer

• ATM adaptation layer (AAL)

Physical Layer

In a Bay Networks Backbone Node (BN

) router, Intelligent Link Interface (ILI)

pairs provide access and processing. An ILI pair consists of a link module and a

processor module that work together to process and transmit information over a

network. Bay Networks provides an ATM Routing Engine (ARE) link module in

conjunction with an ARE processor.

In addition, Bay Networks provides a hub version of the ATM ARE ILI pair, the

Model 5782 ATM router. This single hub module, incorporating the ILI functions

of both the link module and processor module, resides in a System 5000BH

chassis. See Using the Model 5782 ATM Virtual Network Router for more

information.

The ILI pair and the Model 5782 ATM router are functionally identical, and you

configure them in much the same way. Unless otherwise noted, the remainder of

this guide treats the router ILI pair and the Model 5782 as if they were the same.

Depending on the ATM router type, you can connect directly to an ATM network

over any of the following physical interfaces:

• Optical carrier level 3 (OC-3)

• Digital service level 3 (DS-3)

• E-3 (the European equivalent of the North American DS-3)

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