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2 - 34 ONline Ethernet 10BASE-FL Installation and Operation Guide
In Figure 2-12, if the main link from Concentrator A to Concentrator C
faults, the signal path enabled through redundancy includes Concentrator
B. By adding Concentrator B, the fiber equivalent distance becomes too
great and the network cannot work because the path between
Concentrators C and D is C-B-A-D:
4 * 560 + 500 m + 1000 m + 500 m + 500 m + 500 m = 5240 meters
Because the sum is greater than 4200 meters, this configuration is not
legal. When designing a redundant network, be sure to consider the
backup route distance.