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50 SunFDDI/P 1.0 Adapter User’s Guide—May1997
6
FDDI Network Model
FDDI provides high-performance, multistation networking at data transfer
rates of up to 100 Mbps. It is based on a Token-Ring network architecture, and
provides communication over optical fiber or copper twisted-pair connections.
The ANSI/FDDI specifications define a network model that consists of the
following components:
• Physical Medium Dependent (PMD) Layer
• Physical (PHY) Layer
• Medium Access Control (MAC) Layer
• Station Management (SMT) Protocol
Figure 6-1 shows the organization of these components, and their relationship
with other network protocols that use them.
Figure 6-1 FDDI Architectural Model
OSI TCP/IP
DLPI interface V2 / BSD ifnet
LLC/Subnetwork Access Protocol (SNAP)
Media Access Control (MAC) layer
Physical (PHY) Layer
Physical medium dependent (PMD) layer
User space
Kernel space
Hardware
Station Management
(SMT)