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This is also true for the data cabling I work with. One conductor failing will not cause the whole cable run to fail. You may not be able to use the cable run because the system needs all the conductors up, but that's the demand of the device using it, not the cable/harness itself. Though, for data cabling, it's much harder to swap one conductor out due to it being hundreds of feet, twisted pair and sheathed. So, you run more cables than you need and if one conductor breaks, you just move to another set. No need to replace the whole run. FiberOp is similar. You can have your TX snap and your RX is fine. So you can move your TX over to another fiber and it's back up w/o needing to also move over the RX or have an entirely new fiber run pulled.
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