3Com corebuilder 3500 Implementation Manual page 90

90 C 6: F D
HAPTER IBER
D I
ISTRIBUTED ATA NTERFACE
Figure 12 illustrates the relationship of FDDI entities to the OSI Reference
Model. Network attachments communicate with each other using
predetermined protocols. The model divides these communication
protocols into seven layers, which are defined so that each layer only
requires services from the layer below it.
Figure 12 FDDI Relationship to OSI Reference Model
Application Layer
Presentation Layer
Session Layer
Transport Layer
Network Layer
Data-Link Layer
Physical Layer
(FDDI)
LLC (Logical Link Control) — IEEE 802.2
MAC
PHY
PMD
SMT
FDDI