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Designing and Expanding the Network 2 - 29
❑ Remote Failure Signaling Configuration - If redundancy is enabled
at the other end of the fiber link, you must enable remote failure
signaling for all connecting 10BASE-FL Module ports.
Implementing Backbone Cable Plant Fault Tolerance
You can enable redundancy between two ports on the 10BASE-FL Module
using either:
❑ Network management module commands
❑ A dip switch
This section describes:
❑ Setting Redundancy
❑ Remote Failure Signalling
Setting Redundancy
When you enable redundancy between two ports, the ports are
automatically enabled. Port 1 (or 3) then becomes the primary link and port
2 (or 4) the redundant link. For maximum cable plant fault tolerance,
connect both the primary and backup ports back to the central
concentrator (Figure 2-10). This configuration allows the backup port to
automatically take over if the primary link fails.