Exam N10-009 topic 1 question 84 discussion

Actual exam question from CompTIA's N10-009

Question #: 84
Topic #: 1

A customer is adding fiber connectivity between adjacent buildings. A technician terminates the multimode cable to the fiber patch panel. After the technician connects the fiber patch cable, the indicator light does not tum on. Which of the following should a technician try first to troubleshoot this issue?

A. Reverse the fibers.
B. Reterminate the fibers.
C. Verify the fiber size.
D. Examine the cable runs for visual faults.

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Suggested Answer: A 🗳️

by SuntzuLegacy at Nov. 30, 2024, 3:48 a.m.

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HeatSquad77

Highly Voted 5 months, 3 weeks ago

Selected Answer: A

A. Reverse the fibers. Explanation: In fiber optics, multimode cables often use duplex connectors, and the transmit (Tx) and receive (Rx) fibers need to be properly aligned. If the indicator light does not turn on, it could be due to the Tx and Rx being mismatched. Reversing the fibers is the quickest and easiest troubleshooting step to verify this alignment issue before moving on to more complex checks like examining the cable or reterminating fibers.

upvoted 6 times

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SuntzuLegacy

Most Recent 6 months, 4 weeks ago

Selected Answer: A

The correct answer is: A. Reverse the fibers. Explanation: When terminating and connecting fiber cables, it's common to inadvertently reverse the transmit (Tx) and receive (Rx) fibers. In a fiber connection, one strand of the cable is used for transmitting data, while the other is used for receiving. If these strands are reversed, the devices cannot communicate, and the indicator light will not turn on. Reversing the fibers is a quick and easy step to verify if the issue is due to Tx/Rx mismatching.

upvoted 3 times

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