During the deployment of a single-mode fiber optic link, a network technician suspects that the transposition of TX and RX has occurred because the endpoints are not communicating. What would be the BEST immediate step to confirm and address the suspected issue?
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Use a light source or visual fault locator to check connectivity and orientation
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Replace the single-mode fiber with a multimode fiber to verify link capability
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Adjust adapter settings on the network interface cards at both ends
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Review the system logs for errors on the fiber link interfaces
The most effective method for diagnosing and correcting a suspected TX/RX transposition in fiber optic links is to use a light source or visual fault locator. By sending a visual signal through the fiber, the technician can observe whether the light is emitted at the expected receiver side, which would confirm a transposition error if no light is observed where it is expected. Adjusting the adapter settings does not address physical misconnections, and observing indicator LEDs may not conclusively indicate the specific cause of TX/RX transposition, but rather general connectivity issues.
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What are TX and RX in fiber optic communication?
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What is a light source or visual fault locator, and how does it work?
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Why is it important to distinguish between single-mode and multimode fiber?