Apt Fiber Chapter 4

Front 1

Which is the most important consideration when installing fiber cable in a building?

Back 1

Building codes

Front 2

Which of the following manufacturer ratings must always be adhered to?

Back 2

Tensile strength and bend radius

Front 3

Underground cables can be of the direct buried type, but also made to run through conduits.

Back 3

True

Front 4

A fiber cable containing a tightly buffered fiber, a Kevlar strength member, and is jacketed is a

Back 4

Simplex cable

Front 5

A fiber cable containing 2 fibers joined with a thin web and used for patch cord, back plane and desktop connection s is a

Back 5

Zip-cord cable

Front 6

A fiber cable containing several buffered fibers bundled under the same jacket, with a kevlar or fiberglass rod reinforcement, and used for short, dry conduit runs; riser runs and plenum runs is a

Back 6

Distribution cable

Front 7

A fiber cable made of several simplex cables bundled together, suitable for conduit, riser and plenum applications, in which each fiber is individually reinforced to allow for quick termination to connectors is a

Back 7

Breakout cable

Front 8

A fiber cable composed of several fibers together inside a small plastic tube, in which the fibers are wound around a central strength member and jacketed to provide a small diameter cable with a high fiber count, and which is used in conduit, overhead and direct buried applications is a

Back 8

loose tube cable

Front 9

A fiber cable that is indoor, tight buffered and non-breakout style is called:

Back 9

distribution cable

Front 10

Fiber cables that are fire resistant for use inside building air plenums are called:

Back 10

Plenum cables

Front 11

fiber cables made for under-water use are called

Back 11

submarine cables

Front 12

fiber cables designed for use inside buildings must meet NEC article 770 requirements for

Back 12

flame and smoke retardent

Front 13

a fiber cable that contains both single-mode and multi-mode fibers, or that contain copper and fiber in the same cable is called a

Back 13

composite cable

Front 14

in the OFN cable rating, OFN stands for

Back 14

Optical fiber Non-conductive

Front 15

in the OFC cable rating, OFC stands for

Back 15

Optical fiber conductive

Front 16

In the cable ratings OFNG and OFCG the G stands for

Back 16

General purpose

Front 17

in the cable ratings OFNR and OFCR the R stands for

Back 17

Riser rated

Front 18

In the cable rating OFNP and OFCP the P stands for

Back 18

Plenum rated

Front 19

IN the cable rating OFN-LS the LS stands for

Back 19

Low smoke

Front 20

Electrical power cables can serve as physical supports or carriers of fiber cables since energy from the electro-magnetic power signals do not interfere with the optical light pulses traveling in fiber

Back 20

true

Front 21

Metal sheaths are used in some fiber cables to allow for electrical grounding and for cable locating equipment

Back 21

true

Front 22

which of the following is NOT a buffer type available for fiber cables:

Tight buffer

Loose buffer

Filled buffer

Hollow buffer

Back 22

Hollow buffer

Front 23

the presence of water molecules at the surface of glass fibers has no measurable effect on the propagation of optical energy through fibers

Back 23

true

Front 24

what are the methods by which water can indirectly degrade communications performance of fiber optic cables?

Back 24

Moisture in loose tube fibers that freezes, fatigue crack growth causes water to penetrate micro-bending cracks, and chemical erosion.

Front 25

what provides impact protection on fiber optic cables?

Back 25

Cladding, Jacket, and conduits

Front 26

the standard fiber cable color code accounts for how many different fibers?

Back 26

12

Front 27

What is the standard color for 8.3/125 micro meter fiber cordage?

Back 27

yellow

Front 28

what is the standard color for 62.5/125 micro meter fiber cordage?

Back 28

orange

Front 29

Which of the following is not a standard fiber connector?

ST

bitronic

SC

biconic

Back 29

Bitronic

Front 30

Which of the following is not a standard fiber connector?

FC

SC Duplex

FDDI

SC Triplex

Back 30

SC Triplex

Front 31

Which of the following is not a standard fiber connector?

SMA

D4

ESCON

SLACON

Back 31

SLACON

Front 32

All standard fiber connectors are male gender and are physical contact (PC) type, meaning the cores touch when properly connected.

Back 32

True

Front 33

Which of the following statements is NOT true regarding connectors?

A. connectors are used mostly on patch panels, adapters and test equipment interfaces.

B. Connectors can provide low losses and high reflected power when installed correctly.

C. connectors provide convenient testing points.

D. connectors are always used as permanent joints between two fibers.

Back 33

D. Connectors are NOT always used as permanent joints between two fibers

Front 34

Polishing (the surface of fiber connectors) is mainly used for what function?

Back 34

Preparing the ends of fibers for a mechanical splice.

Front 35

is it necessary to clean a fiber connector every time you break and make a connection using the same two connectors?

Back 35

Yes

Front 36

What does the term "insertion loss" of a coupler mean?

Back 36

Optical power loss inserted by the device.

Front 37

Which coupler offers no insertion loss?

Back 37

Active coupler

Front 38

The TIA/EIA 568A standard specifies the maximum insertion loss for each connection of a mated connector and sleeve pair at:

Back 38

.75db

Front 39

The popular connector found on many older systems that are still in use is the

Back 39

Biconic

Front 40

What are the two most common types of light sources used in fiber communications?

Back 40

Light Emitting Diodes (LED) and LASER Diodes

Front 41

The spectral line width of typical laser diodes is approximately

Back 41

2nm

Front 42

The spectral line width of the typical Light Emitting Diode is approximately

Back 42

40nm

Front 43

How is laser diode light produced?

Back 43

Through the use of facets or mirrors, photons are produced using stimulated light emissions

Front 44

What is not the advantage of light emitting diodes (LED)?

Back 44

Has wide spectral line width

Front 45

What is the range of rise time available from LED's?

Back 45

between 3ns - 100ns

Front 46

an LED's wider spectral line width compared to a LASER diode gives the LED an advantage over the laser diode

Back 46

False

Front 47

The two types of LED's used in fiber optics are the

Back 47

Surface emitting and side emitting LED's

Front 48

What safety rating do class 1 lasers have?

Back 48

Very low-power laser consideration being inherently safe

Front 49

What safety rating do class 4 lasers have?

Back 49

Very high power laser that can cause permanent damage.

Front 50

Tube type LASERs and external resonant Cavity LASERs are rarely used in fiber optic communication

Back 50

True

Front 51

Both the positive intrinsic Negative receiver and the avalanche Photo diode offer multi-gigabit per second capability

Back 51

True

Front 52

Which statement is true regarding Avalanche Photo Diodes (APD) and Positive Intrisic Negative (PIN) diodes when used as detectors?

A) PIN's add current gain where APD's insert current loss.

B) APD's add current gain where PIN's insert current loss.

C) both APD's and PIN's are reverse biased.

D) both b and c are correct

Back 52

D is correct. APD's add current gain where PIN's insert current loss. Both APD's and PIN's are reverse biased.

Front 53

The PIN detector is popular in use because at higher data rates the PIN has better frequency response than does the Avalanche.

Back 53

true

Front 54

What is meant by "Dark Current"?

Back 54

Unwanted Bias current that flows in the detector circuit when no light is present.

Front 55

What is the term used to describe the weakest signal that a receiver can detect?

Back 55

Receiver sensitivity

Front 56

What does the term "Dynamic Range" mean of a detector?

Back 56

Minimum to maximum sensitivity range of a light detector.

Front 57

What is the main purpose of photo detection circuits?

Back 57

Convert light pulses to digital electronic pulses.

Front 58

spectral response of a photo diode is a measure of the device's response to a change in:

Back 58

Input wavelength

Front 59

BER

Back 59

Bit Error Rate

Front 60

WDM

Back 60

Wavelength Division Multiplexing

Front 61

TDM

Back 61

Time Division Multiplexing

Front 62

DWDM

Back 62

Dense Wavelength Division Multiplexing

Front 63

Attenuation

Back 63

The decrease in power of a signal

Front 64

Modulation

Back 64

The systematic changing of the properties of a electronic wave, using a second signal, to contain the information contained in the second signal.

Front 65

Multiplexing

Back 65

a way of sending multiple signals or stream of information over a communication link at the same time in the form of a single, complex signal. The receiver then separates the signals, a process called demultiplexing.

Front 66

St and sc connectors have a ferrule diameter of

Back 66

2.5 mm

Front 67

small Form Factor Connectors have ferrule diameter of

Back 67

1.25 mm

Front 68

Attenuation (loss) readings in optical fiber are expressed in what units?

Back 68

db (decibels)

Front 69

What is the total diameter of the primary buffer coating?

Back 69

250 micro meters

Front 70

What is the total diameter of tight buffer coating?

Back 70

900 micro meters

Front 71

What cable is typically held together by 12 fibers held together by plastic tape, and offers the greatest fiber fiber count in the smallest diameter?

Back 71

Ribbon cable

Front 72

What cable consists of both SM (single mode) and MM (multi mode) fibers?

Back 72

Hybrid cables

Front 73

Transmitter is:

Back 73

The light source

Front 74

Receiver is:

Back 74

The light detector

Front 75

Bandwidth of digital fiber systems can be limited by:

Back 75

Fiber response time, transmitter rise time, and receiver response time.

Front 76

Om1 and om2 are...

Back 76

Legacy multimode

Front 77

Om3 and om4 are...

Back 77

Laser optimized

Front 78

What color represents multimode?

Back 78

Orange

Front 79

What color represents polarized?

Back 79

Blue

Front 80

What color represents single mode?

Back 80

Yellow

Front 81

100 meters= how many kilometers?

Back 81

.1kilometers

Front 82

NEC

Back 82

National electrical code

Front 83

NEC Article 250

Back 83

Bonding and grounding

Front 84

NEC Article 770

Back 84

Installation of fiber optic cables in buildings

Front 85

Simple fiber optic system consists of:

Back 85

Transmitter, fiber, connectors, and receiver