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?
Adjust adapter settings on the network interface cards at both ends
Replace the single-mode fiber with a multimode fiber to verify link capability
Use a light source or visual fault locator to check connectivity and orientation
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 visible signal through the fiber, the technician can observe whether the light appears at the expected receiver side. A lack of light at the intended receiver, or light showing on the opposite fiber, indicates that the transmit and receive fibers are crossed. Adjusting adapter settings does not correct physical misconnections, replacing the cable type is unnecessary, and reviewing system logs is unlikely to pinpoint this specific physical-layer error.
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ELI5: What are TX and RX in fiber-optic communication?
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What is a visual fault locator?
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Why is multimode fiber not suitable in this situation?