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مشاهدة النسخة كاملة : What is a DXI?



A7med Baraka
04-15-2009, 08:48 PM
The ATM DXI (Data Exchange Interface)is basically the functional
*****alent of the SMDS DXI. Routers will handle frames and packets but not
typically fragment them into cells; DSUs will fragment frames into cells as
the information is mapped to the digital transmission facility.

The DXI, then, provides the standard interface between routers and DSUs
without requiring a bunch of proprietary agreements. The SMDS DXI is
simple 'cause the router does the frame (SMDS level 3) and the DSU does
the cells (SMDS level 2). The ATM DXI is a little more complicated
since it has to accomomodate AAL3/4 and/or AAL5 (possibly concurrently).