FIBER TESTING AND MAINTENANCE ACTUAL

FIBER TESTING AND MAINTENANCE (ACTUAL / )

EXAM QUESTIONS AND VERIFIED CORRECT ANSWERS

When working with specialized tools to troubleshoot and fix a fiber-optic system, - ----Answers---An optical time domain reflectometer (OTDR) transmits pulses of light into the fiber, then detects and measures the amount of reflected light.

In regard to the different fiber-optic test sets, which of the following statements is true? - ----Answers---The optical return loss test set is used to measure the amount of reflected energy caused by Fresnel reflections.

Regarding the various pieces of fiber-optic troubleshooting test equipment, - ----Answers---Optical power meters determine the overall loss of an optical fiber, but the optical time domain reflectometer (OTDR) can display the fiber's loss characteristics throughout.

As you begin to identify trouble within fiber-optic systems, it's important to consider which of the following? - ----Answers-- -No matter how complex, all systems are composed of point- to-point links consisting of a source (transmitter) and a detector (receiver) connected by an optical fiber.

When testing the optical receiver portion of an optical link with an optical power meter, - ----Answers---Disconnect the jumper from the input to the receiver, clean the optical 1 / 3

connectors, and connect the receive jumper to the power meter.

To test the optical path between the receiver and the transmitter in order to analyze a fiber problem, - ---- Answers---The optical time domain reflectometer (OTDR) must be set up prior to proceeding with any test, or at least the set-up information must be checked and confirmed.

What will you find when locating trouble in the outside plant with the optical time domain reflectometer (OTDR)? - ---- Answers---Both reflective and nonreflective events are located at the start of the knee where the average slope of the trace first changes.

While locating problems on a fiber with an optical time domain reflectometer (OTDR), - ----Answers---Measurements made manually for distance measurements identifying reflective events tend to be easier to make and are more accurate than those manually taken for nonreflective events.

What should you do to begin diagnosing the cause of a problem that has been isolated? - ----Answers---Examine the fibers with the optical time domain reflectometer (OTDR) on both sides of the major event for any inconsistency in the trace.

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The National Electrical Safety Code (NESC) requires drop cables to be placed at what minimum depth? - ----Answers-- -18 inches.

When troubleshooting radio frequency over glass (RFoG) and passive optical network (PON) FTTx systems that use longer wavelengths, what is the common cause of higher losses that should be addressed? - ----Answers---Macrobends and microbends caused by improper bending and pinching of cables and patch cords.

In fiber network restoration planning, - ----Answers--- Responsibility for update and control of the restoration plan document must be defined or it will quickly become obsolete and useless.

What can happen inside fiber-optic equipment room facilities?

• ----Answers---Failures can typically arise at patch panels,

somewhere in opto-electronic systems, and because of installation practices.

How is a restoration posture for a fiber network acquired? - -- --Answers---The basic resources required to respond to a major system outage are documentation, technical skill, and basic troubleshooting/repair equipment and materials.

What is an important consideration in structuring a flow chart of basic restoration activities? - ----Answers---The

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