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3-1
Chapter 3
Operation
The 9F206-02 module, as shown in Figure 3-1, provides two repeater ports that
extend the FNB bus outside the MMAC-Plus chassis. No bridging or routing is
done in this module. Each port connects to both rings (Primary and Secondary) on
each FNB (FNB-1 and FNB-2).
Figure 3-1. 9F206-02 Block Diagram
Flexible Network Bus (FNB)
The FNB consists of two dual FDDI networks, FNB-1 and FNB-2, providing up to
400 Mbps of data bandwidth. These FDDI networks are 100% ANSI FDDI-
compliant supporting SMT (version 7.3), MAC, PHY, and PMD standards. This
allows the FNB to traverse multiple MMAC-Plus hubs, or connect to any ANSI
FDDI-compliant device, through standard A/B port connections.
FNB -1 and
FNB -2
System Diagnostic
Controller
SMB-1
DC/DC
Converter
FDDI-1
FDDI-2
Front Panel
Connections
Driver/Receiver
FNB Interface
Driver/Receiver
FNB Interface
B
A
B
A