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Dan2024 Study > Fiber/Networking Misc > Flashcards

Fiber/Networking Misc Flashcards

1
Q

3 most basic functions of any spectrum analyzer

A

frequency, span, amplitude

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2
Q

3 types of optical power meters

A

Silicon (Si)
Germanium (Ge)
Indium-Gallium Arsenide (In-Ga-As)

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3
Q

Range for visible light

A

390nM-780nM and 384THz-769THz

380nM-740nM per https://en.wikipedia.org/wiki/Visible_spectrum

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4
Q

(8x10-21)

A

Cosmic Rays

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5
Q

4-13GHz

A

satellite

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6
Q

10 LOG (mW)

A

1 mW = P = 0dBm

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7
Q

10LOG(mw)

A

dBm

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8
Q

2ndLOG (dBm/10)

A

mW

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9
Q

20LOG (E(mv)/1) or 20LOG (E1(mv)/E2(mv))

A

dBmv

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10
Q

10LOG P1/P2 10 times the log10 power of p1/p2

A

dB

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11
Q

This amount of excess fiber optic cable is stored during construction

A

5%

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12
Q

Nominal impedance

A

75 ohms

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13
Q

How is total loss calculated

A

cable loss + passive loss

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14
Q

How is expected level calculated

A

starting level - total loss

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15
Q

Light Spectrum (these vary wildly based on source): Red

A

625nM-740nM

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16
Q

Light Spectrum (these vary wildly based on source): Orange

A

590nM-625nM

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17
Q

Light Spectrum (these vary wildly based on source): Yellow

A

565nM-590nM

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18
Q

Light Spectrum (these vary wildly based on source): Green

A

500nM-565nM (cards say 550nM)

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19
Q

Light Spectrum (these vary wildly based on source): Cyan

A

485nM-500nM

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20
Q

Light Spectrum (these vary wildly based on source): Blue

A

450nM-485nM (cards say 480nM)

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21
Q

Light Spectrum (these vary wildly based on source): Violet

A

380nM-450nM (cards say 455nM)

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22
Q

RFoG Downstream wavelength

A

1550 nm

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23
Q

What is the angle on an APC connector?

A

8 degree angle to normal

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24
Q

Number one form of dispersion in multimode fiber

A

Modal dispersion

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25
Q

2 popular types of wave division multiplexing

A

Coarse and Dense

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26
Q

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

A

26 to 28 dB

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27
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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28
Q

Two types of extrinsic loss

A

macrobends and microbends

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29
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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30
Q

Lights on the front of XF3

A

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

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31
Q

equation to determine wavelength

A

wavelength =speed of light in a vacuum divided by frequency

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32
Q

Mid-Split architecture upstream range

A

5 MHz to 88 MHz

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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

What color is the fiber connector used in FTTP installations?

A

Green

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36
Q

R-ONU

A

RFoG Optical Network Unit

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37
Q

Residential device that supports Comcast EPON

A

XF3

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38
Q

Commercial device that supports Comcast EPON

A

CFG-3

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39
Q

A waveform is typically represented by the Greek letter:

A

Lamda

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40
Q

zero dBW is another way of saying

A

1 mW

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41
Q

GPON uses what type of frames?

A

GEM frames

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42
Q

EDFAs can boost optical signal as much as

A

26 dBm

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43
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

44
Q

RFoG Upstream wavelength

A

1610 nm or 1310 nm

45
Q

RFoG uses what band for upstream communication

A

1610 nm

46
Q

The least serious absorption in glass occurs near these wavelengths

A

1310nm and 1550nm

47
Q

EPON light signal needs to be between ____ and ____

A

-28.5 and -8 dBm

48
Q

the shorter the wavelength, the ___ the frequency

A

higher

49
Q

The bending radius of 3mm fiber optic cable is

A

1.25 inches

50
Q

What type of modulation does RFoG use?

A

analog intensity modulation

51
Q

Fiber Deep Upstream Wavelength

A

1310 nm

52
Q

Four types of dispersion

A

Modal
Chromatic
Waveguide
Polarization-mode

53
Q

light propagates inside the core of the fiber by means of

A

total internal reflection

54
Q

Fiber Deep Downstream Wavelength

A

1550 nm

55
Q

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

A

Wifi, Ethernet, and MoCa

56
Q

EPON Upstream wavelength

A

1310 nm

57
Q

EPON Downstream wavelength

A

1490 nm

58
Q

Power supply used for XF3

A

12 Volt Power Supply

59
Q

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

A

22 to 24 dB

60
Q

EPON uses what type of frames?

A

Ethernet frames

61
Q

traditional HFC upstream range

A

5 MHz to 42 MHz

62
Q

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

A

Multimode fibers

63
Q

3 Elements of Epon

A

Fiber Delivery
XF3 Modem Delivery
All IP Video Delivery

64
Q

What is the purpose of a WDM filter in optical power meter or OTDR (optical time-domain reflectometer)?

A

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

65
Q

Absorption is what type of loss in fiber

A

intrinsic loss

66
Q

How many fibers are typically in a bundle or tube?

A

12

67
Q

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

A

50 vAC

68
Q

Three Basic Components of Optical Fiber

A

protective coating, cladding, core

69
Q

Color Coding of Fiber Optic Cables

A 
Blue
Orange
Green
Brown
Slate
White
Red
Black
Yellow
Violet
Rose
Aqua
70
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 (Erbium Doped Fiber Amplifier)?

A

14 km

71
Q

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

A

18 to 20 dB

72
Q

RFoG uses what band for downstream communication?

A

1550 nm

73
Q

UPC connectors are what color?

A

Blue

74
Q

5 components of CRAN

A

Hub sites, U ring, S ring, Regional core, Regional network

75
Q

How many Backbones does Comcast have and their names?

A
  1. Cbone (private), Ibone (Internet)
76
Q

the nominal acceptable C/N for reliable operation for 256QAM is

A

38dB

77
Q

the nominal acceptable C/N for reliable operation for 64QAM is

A

31dB

78
Q

the nominal acceptable C/N for reliable operation for 16QAM is

A

20dB

79
Q

the nominal acceptable C/N for reliable operation for QPSK is

A

12dB

80
Q

MoCA (Multimedia Over Coax Alliance) OFDM (Orthogonal Frequency Division Multiplexing) how many subcarriers within each channel

A

224

81
Q

What is the maximum cable bundle diameter, in inches, that a cable ā€œDā€ size lasher will accommodate?

A

3 inches

82
Q

What are the two types of distortion?

A

Linear and Non-Linear

83
Q

Total internal reflection was first demonstrated by whom in what year?

A

John tindal 1854 (demonstrated how light reflexted through a stream of water to the royal society of London)

84
Q

What is the maximum loss for a fusion splice?

A

.05 dB

85
Q

What is used to remove Gel from the fibers?

A

At least 90% pure Isopropyl alcohol

86
Q

What is the size of the fiber coating?

A

250 Microns

87
Q

What is the size of the fiber cladding?

A

125 microns

88
Q

what is the size of the fiber core?

A

8-10 microns

89
Q

2 types of fiber

A

Single-mode and multi-mode

90
Q

ANSI standard for Lasers

A

Z-136

91
Q

5 types of Laser classifications?

A

Class 1, Class 2/2A, Class 3A, Class 3B, Class 4

92
Q

Wavelengths above ___ nm are not visible to the human eye?

A

650 nm

93
Q

What is the diameter of an optical fiber?

A

125 Microns

94
Q

2 forms of attenuation in the fiber manufacturing

A

scattering and absorption.

95
Q

cellphone freq allocation

A

824.040 - 848.970 Mhz

96
Q

VHF (Very High Frequency) ch 7-13 freq allocation

A

174-216 Mhz

97
Q

UHF (Ultra High Frequency) ch 14-83 freq allocation

A

470-890 Mhz

98
Q

FM (Frequency Modulation) radio freq allocation

A

88-108 Mhz

99
Q

5 linear distortions

A 
Micro reflections
amplitude ripple
group delay
jitter
notches
100
Q

3 signs of a failing diplex filter

A

drifting
roll off
phase delay

101
Q

2 types of Cipher Algorithms

A

Symmetric key

asymmetric key

102
Q

3 Types of optical power meters

A
  1. Silicon (si)
  2. Germanium (Ge)
  3. indium-gallium arsenide (InGAAs)
103
Q

Signals propagate through either of two mediums

A

guided and unguided

104
Q

The number one cause of ingress and egress occurs where in the system?

A

Drop system

105
Q

A signal of 0 dBmV corresponds to

A

1 mV across a 75-ohm impedance

106
Q

What frequencies are assigned to the downstream and upstream?

A

Up- 5-42 MhzDown- 54-1002 Mhz

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