Avaya Configuring ATM DXI Services Bedienungsanleitung Seite 27

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Understanding ATM DXI Concepts
117375-A Rev. A 2-3
Address Resolution Protocol (ARP) and Inverse ARP support
The DSU/CSU supports the following layers:
Segmentation and Reassembly (SAR) sublayer of the ATM adaptation layer
(AAL)
ATM layer defined in the B-ISDN PRM
Physical layer interface to the ATM network through DS1 and DS3
Multiprotocol Encapsulation
Multiprotocol encapsulation enables the router to multiplex and demultiplex
bridged or routed protocol data units (PDUs).
For transmission, this function adds a header from 2 through 8 octets in length to
the PDU to allow decoding. The decoding process determines the proper service
access point (SAP).
When receiving packets, this function evaluates the header to determine whether
the PDU is a valid routed or bridged packet. If it is valid, this function then strips
the header from the packet and passes it to the appropriate SAP for routing or
bridging.
AAL Sublayer Support
The CS in the router logically connects to the SAR in the DSU/CSU using a
common interface defined by the ATM DXI protocol. The ATM DXI protocol
interface transfers PDUs between the CS and the SAR. Figure 2-2 shows the
functional division of the AAL sublayers between the router and the DSU/CSU.
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