Installing and Administering HP FDDI/9000 Software

Chapter 1 23
FDDI Resources
FDDI Concepts
FDDI Concepts
The Fiber Distributed Data Interface (FDDI) is a high speed local
area network which has been defined as a standard by an American
National Standards Institute committee, ANSI X3T9.5 and by ISO. This
second generation LAN is characterized by a fiber-optic dual token ring
transmission medium which is capable of transmitting data at 100
megabits per second, ten times the speed of Ethernet.
Figure 1-1 shows the four ANSI FDDI standards and how they combine
to form a completely functional fiber optic network. This figure also
shows how these standards fit into the OSI model.
Figure 1-1 FDDI Standards and the OSI Model
The physical layer includes two pieces, the Physical Medium
Dependent (PMD) layer that provides the point-to-point
communications between stations in the network, and the Physical
Application
Presentation
Session
Transport
Network
Data Link
Physical
802.2 Logical Link Control (LLC)
Media Access Control (MAC)
Physical Layer Protocol (PHY)
Station Management
ISO 8802-2:1989 IEEE 802.2-1981
ISO 9314-2:1989
ANSI X3.139-1987
ISO 9314-1:1989
ANSI X3.148-1988
Physical Medium Department (PMD)
ISO 9314-3:1990
ANSI X3.166-1990
ISO to be determined
ANSI X3T9.5/84-49
Revision 7.2