VDV Fiber Optics 5

Question 1

According to TIA-568 standards, what is the maximum channel insertion loss allowed for OM3 multimode fiber at 850 nm for a 100 m horizontal link?

Accepted Answer

2.4 dB

Answer

TIA-568 specifies a maximum channel loss of 2.4 dB for a 100 m OM3 horizontal link at 850 nm, accounting for connectors, splices, and fiber attenuation.

Question 2

What is 'chromatic dispersion' in single-mode fiber?

Accepted Answer

Pulse spreading caused by different wavelengths traveling at different speeds

Answer

Chromatic dispersion occurs because different wavelengths of light have slightly different velocities in the fiber, causing pulse broadening that limits bandwidth over distance.

Question 3

Which fiber optic cable construction uses individual tight-buffered fibers surrounded by a single outer jacket?

Accepted Answer

Tight-buffered breakout (distribution) cable

Answer

Tight-buffered breakout cables house individually buffered 900 µm fibers under one jacket, making each fiber directly connectorizable without a fan-out kit.

Question 4

A technician notices the OTDR shows a 'gainer' (apparent increase in backscatter level) at a splice point. What does this indicate?

Accepted Answer

The fiber after the splice has higher backscatter than the preceding fiber section

Answer

A gainer occurs when the fiber after the splice has a higher backscatter coefficient, making the splice appear to gain power; bidirectional OTDR testing averages out this artifact.

Question 5

What does the term 'OM5' designate for multimode fiber?

Accepted Answer

Wideband multimode fiber supporting short-wavelength division multiplexing (SWDM)

Answer

OM5 (lime green jacket) is a wideband 50/125 µm multimode fiber optimized for SWDM transmission using wavelengths from 850 nm to 953 nm.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Fiber Optics 5