Installing and Administering HP FDDI/9000 Software

24 Chapter 1
FDDI Resources
FDDI Concepts
Layer Protocol (PHY) layer that handles synchronization between
higher layer data and control symbols, and the code bit representation
which is transmitted on the medium.
The data link layer includes the Media Access Control (MAC)
standard and the Logical Link Control (LLC) standard. The MAC's
primary function is the scheduling, routing and delivery of Frames, the
vehicles used to transmit information on and off the ring. In an FDDI
network, information is transmitted sequentially, within frames, as a
stream of encoded symbols from one station to the next. The order of the
symbols within the frames is predetermined by the MAC standard. The
LLC provides a common protocol between the MAC and the network
layer. In addition to FDDI, the LLC standard also applies to 802.3, 802.4,
and 802.5
The Station Management (SMT) standard is a layer management
entity which interfaces with the other sublayers. It manages connections
with the ring as well as station configuration and ring configuration. HP
FDDI/9000 supports SMT version 7.2.
FDDI Network Map
The example network map in Figure 1-2 shows HP Series 700
workstations connected to an FDDI dual ring through a concentrator.
The FDDI network is connected to an 802.3/Ethernet LAN via a router.