Avaya Configuring ATM Services Manual de usuario Pagina 39

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ATM DXI Features and Implementation Notes
2-3
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.
Figure 2-2. AAL Layer Division between Bridge/Router and DSU/CSU
Upper
Layer
Protocols
SAR
Sublayer
Bridge/Router
DSU/CSU
Multiprotocol
Encapsulation
Convergence
Sublayer
ATM
Layer
Physical
Layer
AAL
ATM DXI
ATM DXI
ATM DXI
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