
5-1
Chapter 5
ATM Features and Implementation Notes
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 link module in conjunction with an ATM Routing
Engine (ARE) processor
Either ILI pair allows the router to connect directly to an ATM network over any
of these 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 both ILI pairs convert variable-length packets into uniform,
53-byte cells for transmission over the ATM network (Figure 5-1).
Both ILI pairs are functionally similar, and you configure them in much the same
way. Unless otherwise noted, the remainder of this guide treats both ILI pairs as if
they were the same.
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