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2 - 28 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
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Figure 2-10. Redundant Fiber Backbone Configuration
Note: Always enable redundancy in the lower level concentrators
(those connecting to the central concentrators in the
star-wired topology).
In any redundant link path, only one end can be designated (that is,
activated) as a redundant port pair (ports 1 and 2 or ports 3 and 4). If you
enable 10BASE-FB Module ports at both ends as redundant, improper
operation of the redundant switchover mechanism occurs (see Figure 2-11).