Avaya Configuring ATM DXI Services Manual de usuario Pagina 25

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117375-A Rev. A 2-1
Chapter 2
Understanding ATM DXI Concepts
This chapter discusses the concepts behind the ATM Data Exchange Interface
(DXI) protocol and how we implement this service in Bay Networks routers.
In this chapter, you can
Read more about ATM DXI and how it works
Read about the kinds of support that a router running ATM DXI provides
Review the notes describing how Bay Networks implements special ATM
DXI features.
ATM DXI versus ATM
You can access an ATM network using a synchronous (that is, HSSI, V.35, or
RS-449) connection or a direct ATM connection. When using a synchronous
connection, you must use ATM DXI.
Unlike an ATM interface that connects directly to an ATM network, a Bay
Networks synchronous link module works with a Fast Routing Engine (FRE
®
or
FRE-2) to form an Intelligent Link Interface (ILI) pair. This ILI pair uses ATM
DXI as a wide area network (WAN) protocol to connect to an ATM data service
unit/channel service unit (DSU/CSU). The DSU/CSU then converts these packets
into uniform 53-byte cells for transmission over the ATM network (F
igure 2-1).
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