Avaya Configuring ATM Services Bedienungsanleitung Seite 45

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Understanding ATM Concepts
114056 Rev. A 2-5
Permanent and Switched Virtual Connections
Virtual channels and virtual paths allow you to establish virtual channel links
(VCLs). You can create VCLs as either permanent virtual circuits (PVCs) or
switched virtual circuits (SVCs). Once you establish a PVC, you can transfer
information over it at any time. Switched virtual circuits only activate, through
signaling and network switching, when there is information ready for
transmission.
Physical Layer
In a Bay Networks 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
currently provides the following ATM ILI pairs:
An ATM FRE2 link module in conjunction with a Fast Routing Engine
(FRE2) processor
An ATM Routing Engine (ARE) link module in conjunction with an ATM
Routing Engine processor
In addition, Bay Networks provides a hub version of the ATM ARE ILI pair, the
Model 5780 ATM router. This single hub module, incorporating the ILI functions
of both the link module and processor module, resides in a System 5000 chassis.
Refer to Using the Model 5780 ATM Router for more information.
Both ILI pairs and the Model 5780 ATM router are functionally similar, and you
configure them in much the same way. Unless otherwise noted, the remainder of
this guide treats both ILI pairs and the Model 5780 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:
Synchronous Optical Network/Synchronous Digital Hierarchy
(SONET/SDH)
Digital Service level 3 (DS-3)
E-3 (the European equivalent of the North American DS-3)
This means that any of the ATM routers convert variable-length packets into
uniform, 53-byte cells for transmission over the ATM network.
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