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SMDS Overview

117361-A 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 (F

igure 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

Encapsulates data into PDUs

Segments data into 53-byte PDUs

SMS0002A

Level 1

Level 2

Level 3

Header

Trailer

SMS0003A

LAN packet

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Avaya Configuring SMDS Bedienungsanleitung Seite 17