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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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Avaya Configuring SMDS Bedienungsanleitung Seite 25