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SMDS Overview
114069 Rev. A 1-5
The router next prepares the Level-3 PDU for transmission to the DSU/CSU by
encapsulating it within a DXI header and trailer that provide control information.
Upon receiving the DXI packet, the DSU/CSU strips the DXI header/trailer and
divides the Level-3 PDU into fixed-length (44-byte) units called cells. The
DSU/CSU encapsulates these cells within a 7-byte header and 2-byte trailer to
form Level-2 PDUs.
Finally, the DSU/CSU inserts an additional four bytes of framing information
between each Level-2 PDU and transmits the framed cells across a
Digital Service Level 1 (DS1) or DS3 connection to the SMDS network.
Figure
1-5 shows the assembly of SMDS cells as specified by the DXI.
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