Which of the following is the MOST likely cause of the issue?

A technician is installing a new fiber connection to a network device in a datacenter. The connection from the device to the switch also traverses a patch panel connection.

The chain of connections is in the following order:

Device

LC/LC patch cable

Patch panel

Cross-connect fiber cable

Patch panel

LC/LC patch cable

Switch

The connection is not working. The technician has changed both patch cables with known working patch cables. The device had been tested and was working properly before being installed.

Which of the following is the MOST likely cause of the issue?
A . TX/RX is reversed
B . An incorrect cable was used
C . The device failed during installation
D . Attenuation is occurring

View Answer

Answer: A

Explanation:

The most likely cause of the issue where the fiber connection from a device to a switch is not working is that the TX/RX (transmit/receive) is reversed. When connecting fiber optic cables, it is important to ensure that the TX of one device is connected to the RX of the other device and vice versa. If the TX/RX is reversed, data cannot be transmitted successfully.

Reference: CompTIA Network+ Certification Study Guide, Exam N10-007, Fourth Edition, Chapter 5: Network

Operations, Objective 5.1: Given a scenario, use appropriate documentation and diagrams to manage the network.