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).
FDDI-1
Front Panel
Connections
FDDI-2
DC/DC
Converter
A 
B
A 
B
System Diagnostic
Controller
Driver/Receiver FNB Interface
Driver/Receiver FNB Interface
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.
3-1
