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2018 MM > FTTP & EPON (ER 10-16-18) (ER 10-17-18)(ER 10-30-18) > Flashcards

FTTP & EPON (ER 10-16-18) (ER 10-17-18)(ER 10-30-18) Flashcards

1
Q

reflections that occur at places where the light travels from one medium to another

A

Fresnel reflections

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2
Q

AIM

A

analog intensity modulation

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3
Q

This device acts as an interface between the optical distribution network and the subscriber coaxial wiring.

A

R-ONU

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4
Q

RFoG Downstream wavelength

A

1550 nm

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5
Q

This occurs when two upstream optical transmitters send light upstream at the same time and both transmitters are on exactly the same optical wavelength causing the transmissions to be lost due to distortion of the optical signal.

A

Optical beat interference

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6
Q

used to ensure that all fiber connections are clean of debris and are undamaged.

A

Fiber Scope

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7
Q

What is the angle on an APC connector?

A

8 degree angle to normal

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8
Q

tiny kinks or nicks in the fiber that may be created in manufacturing or be the result of mishandling.

A

Microbend

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9
Q

An optical technology allowing multiple optical signals onto a single fiber by using different wavelengths of laser light.

A

Wavelength division multiplexing

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10
Q

VFL

A

Visual Fault Locator

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11
Q

Number one form of dispersion in multimode fiber

A

Modal dispersion

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12
Q

2 popular types of wave division multiplexing

A

Course and Dense

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13
Q

This tool is used to clean the fiber is called?

A

One Click

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14
Q

Dispersion from light broken into vertically polarized and horizontally polarized components that travel through fiber at different velocities.

A

polarization-mode dispersion

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15
Q

a 128-way optical splitter has approximately how much loss?

A

26 to 28 dB

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16
Q

GPON

A

Gigabit Passive Optical Network

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17
Q

All devices use what kind of fiber connector for the optical interface?

A

SC/APC

standard connector/angled physical contact

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18
Q

consists of all of the optical losses between the optical source and the optical receiver

A

optical loss budget

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19
Q

a network architecture that uses fiber optics and no active devices to service cable subscribers.

A

Passive Optical Network

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20
Q

In this architecture, multiple splitters are distributed at various locations in the outside plant (OSP)

A

distributed split architecture

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21
Q

Two types of extrinsic loss

A

macrobends and microbends

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22
Q

this should be used to make sure that the optical connector is clean,

A

fiber video scope

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23
Q

What will be the lowest amount of power that a fiber deep node will be designed to operate at?

A

-6 dBm

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24
Q

The only type of fiber connector that should be in media panel

A

UPC

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25
Q

Lights on the front of XF3

A

Power, PON, 2.4 GHz, 5 GHz, Phone 1, Phone 2, Moca

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26
Q

equation to determine wavelength

A

wavelength =speed of light in a vacuum divided by frequency

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27
Q

Mid-Split architecture upstream range

A

5 MHz to 88 MHz

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28
Q

OBI

A

Optical beat interference

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29
Q

This type of modulation directly encodes digital 1s and 0s as pulses of light.

A

Baseband Digital Modulation

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30
Q

YEDFA

A

Ytterbium Erbium Doped fiber amplifier

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31
Q

DPoE

A

DOCSIS provisioning over Ethernet

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32
Q

DWDM

A

Dense wavelength divison multiplexing

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33
Q

To ensure an accurate reading when using a fiber scope, use the correct tip and___

A

change to the appropriate tip setting in the probe menu

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34
Q

Per wavelength what is maximum number of home passed in a fiber deep system?

A

128

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35
Q

IoR

A

index of refraction

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36
Q

uses a high-temperature arc to fuse the fiber ends together for a stronger and more permanent splice than a mechanical splicer can provide

A

fusion splicer

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37
Q

joins the fiber ends inside a plastic tube that mechanically holds the fibers in place

A

mechanical splice

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38
Q

What color is the fiber connector used in FTTP installations?

A

Green

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39
Q

R-ONU

A

RFoG Optical Network Unit

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40
Q

Residential device that supports Comcast EPON

A

XF3

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41
Q

Commercial device that supports Comcast EPON

A

CFG-3

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42
Q

These are protocols that allow back office devices to provision and operate GPON or EPON as if it were a DOCSIS network.

A

DPoE and DPoG

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43
Q

OTDR

A

optical time domain reflectometer

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44
Q

TIR

A

total internal reflection

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45
Q

this type of fiber has multiple fibers arranged in a flat row.

A

Ribbon Fiber

46
Q

OSS

A

Operations support system

47
Q

A waveform is typically represented by the Greek letter:

A

Lamda

48
Q

zero dBW is another way of saying

A

1 mW

49
Q

GPON uses what type of frames?

A

GEM frames

50
Q

This LASER has a lower power output and higher dispersion than a DFB LASER

A

Fabry-Perot

51
Q

EDFAs can boost optical signal as much as

A

26 dBm

52
Q

If you have a 2-way optical splitter, what is the maximum distance to the node that is possible without the use of an EDFA?

A

25 km

53
Q

dedicated fibers leave a centralized splitter and feed individual customer premises

A

centralized split architecture

54
Q

RFoG Upstream wavelength

A

1610 nm or 1310 nm

55
Q

RFoG uses what band for upstream communication

A

1610 nm

56
Q

The least serious absorption in glass occurs near these wavelengths

A

1310nm and 1550nm

57
Q

A semiconductor device that converts light into an electrical current

A

Photodiode

58
Q

This is made of materials that change colors when exposed to light at the wavelengths used for fiber optic communication

A

photosensitve card

59
Q

ports for connecting fibers that can be found in a Fiber House Box

A

bulkheads

60
Q

EPON light signal needs to be between ____ and ____

A

-28.5 and -8 dBm

61
Q

the shorter the wavelength, the ___ the frequency

A

higher

62
Q

DFB

A

Distributive Feedback

63
Q

This approach is similar to the tapped feeder used in conventional HFC networks. In this architecture, a single fiber is used to feed the network. Placed along this single fiber are multiple optical taps.

A

distributed tap architecture

64
Q

EIA/TIA

A

Electronic Industries Alliance/Telecommunications Industry Association

65
Q

Tool Used to measure the quantity and quality of the signal carried by the fiber

A

Power Light Meter

66
Q

The bending radius of 3mm fiber optic cable is

A

1.25 inches

67
Q

This is placed over the fiber prior to splicing

A

Heat-Shrink Sleeve

68
Q

What type of modulation does RFoG use?

A

analog intensity modulation

69
Q

Visible light spectrum (in nm.)

A

750 nm to 380 nm

70
Q

this can be used to test for the presence of light between 850nm to 1550nm

A

A photosensitve card, or infrared detection card

71
Q

Fiber Deep Upstream Wavelength

A

1310 nm

72
Q

ODN

A

Optical distribution network

73
Q

WDM

A

Wavelength division multiplexing

74
Q

Four types of dispersion

A

modal, chromatic, waveguide, polarization-mode

75
Q

light propagates inside the core of the fiber by means of

A

total internal reflection

76
Q

EPON and GPON interface with what in the headend?

A

Optical Network Terminal

77
Q

Fiber Deep Downstream Wavelength

A

1550 nm

78
Q

The XF3 will deliver Xfinity services via 3 different methods. what are they?

A

Wifi, Ethernet, and MoCa

79
Q

Dispersion due to small amount of light that travels in the interface between the core and the cladding. Light travels faster in the interface than it does in a core

A

waveguide dispersion

80
Q

EPON Upstream wavelength

A

1310 nm

81
Q

EPON Downstream wavelength

A

1490 nm

82
Q

Power supply used for XF3

A

12 Volt Power Supply

83
Q

A 64-way optical splitter has approximately how much loss?

A

22 to 24 dB

84
Q

EPON uses what type of frames?

A

Ethernet frames

85
Q

traditional HFC upstream range

A

5 MHz to 42 MHz

86
Q

EDFA

A

Erbium doped fiber amplifier

87
Q

What types of fibers are generally used where the distances are relatively short?

A

Multimode fibers

88
Q

3 Elements of Epon

A

Fiber Delivery
XF3 Modem Delivery
All IP Video Delivery

89
Q

Dispersion caused by different wavelengths traveling at different velocities causing signal to arrive at different times

A

Chromatic disperison

90
Q

What is the purpose of a WDM filter in optical power meter or OTDR?

A

To allow measurements of specific wavelengths when multiple wavelengths are active in the fiber simultaneously

91
Q

acceptable wireless level for Xi5 and Xi6 boxes.

A

-65 RSSI or better

92
Q

Absorption is what type of loss in fiber

A

intrinsic loss

93
Q

How many fibers are typically in a bundle or tube?

A

12

94
Q

a power link between two segments of a network. Those two segments only share the AC power, not the RF signal.

A

Power Bussing

95
Q

Dispersion due to a larger core allowing light to break up into many different modes or paths

A

Modal Dispersion

96
Q

What is the minimum voltage needed in order for the node to work?

A

50 vAC

97
Q

The 3 converters that are compatible with the XF3

A

Xi5, Xi6, and XiD

98
Q

Three Basic Components of Optical Fiber

A

protective coating, cladding, core

99
Q

This type of modulation is accomplished by varying the intensity of the light in direct proportion to the analog electrical signal that is applied to the optical tansmitter

A

Analog Intensity Modulation

100
Q

Color Coding of Fiber Optic Cables

A 
Blue
Orange
Green
Brown
Slate
White
Red
Black
Yellow
Violet
Rose
Aqua
101
Q

If you have a 4-way optical splitter, what is the maximum distance to the node that is possible without the use of an EDFA?

A

14 km

102
Q

DPoG

A

DOCSIS provisioning over Gigabit

103
Q

EPON

A

Ethernet Passive Optical Network

104
Q

This causes high loss by allowing light to escape from the core into the cladding of the fiber

A

Macrobend

105
Q

a 32-way optical splitter has approximately how much loss?

A

18 to 20 dB

106
Q

PON

A

Passive optical network

107
Q

designed to transport the same radio frequency (RF) signals, such as QAM and analog video, that are carried by conventional HFC networks.

A

RFoG

108
Q

RFoG

A

Radio Frequency Over Glass

109
Q

RFoG uses what band for downstream communication?

A

1550 nm

110
Q

When working with fiber, especially when cutting or splicing, one should work above a slightly adhesive, dark surface called a

A

tacky mat

111
Q

UPC connectors are what color?

A

Blue

2018 MM (59 decks)

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