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SMDS Overview
114069 Rev. A
1-3
Figure 1-2. SMDS Interface Protocol Stack
SIP specifies that the SMDS source and destination addresses reside in the
Level-3 PDU header (Figure
1-3). Each header contains a MAC-level address in
an E.164 address format. E.164 formats are 64 bits long and provide both
individual and multicast addresses. Network switches use the address information
in the header to route the PDU to its destination.
Figure 1-3. SMDS Level-3 PDU
One or more SMDS devices, for example DSUs and routers, can perform the tasks
of the three SIP levels, as described in the next section.
Prepares Level-2 PDUs for the Physical Medium
Level 3
Encapsulates Data into PDUs
Level 2
Segments Data into 53-byte PDUs
Level 1
SMS0002A
Header
Trailer
LAN Pac etk
SMS0003A
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