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Chapter 10: Use the Visual Fault
Locator
Visual Fault Locator Applications
The CertiFiber Pro and OptiFiber Pro modules include a visual
fault locator that sends a red light down the fiber. The red light
shows at the end of the fiber and at breaks, cracks, and sharp
bends along the fiber.
The VFL also helps you quickly verify the continuity of fibers,
identify connectors, and find faults along fibers and in
connectors.
The VFL helps you do these tasks:
• Quickly verify the continuity of fibers.
• Identify the polarity of duplex connections.
• Identify connections in patch panels.
• See breaks and bad splices. These faults cause the fiber to
emit red light.
• See high-loss bends. If you can see the light from the VFL at a
bend in a fiber, the bend is too sharp.
• See connectors that have damaged fibers inside. A damaged
fiber inside a connector causes a red light in the connector.
• Increase the quality of mechanical splices and pre-polished
connectors: Before you seal the splice or connector, adjust the
fiber alignment for the minimum amount of light where the
fibers touch. (Refer to the instructions from the manufacturer
when you make splices and connectors.)
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