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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

(111 cards)

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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
Lights on the front of XF3
Power, PON, 2.4 GHz, 5 GHz, Phone 1, Phone 2, Moca
26
equation to determine wavelength
wavelength =speed of light in a vacuum divided by frequency
27
Mid-Split architecture upstream range
5 MHz to 88 MHz
28
OBI
Optical beat interference
29
This type of modulation directly encodes digital 1s and 0s as pulses of light.
Baseband Digital Modulation
30
YEDFA
Ytterbium Erbium Doped fiber amplifier
31
DPoE
DOCSIS provisioning over Ethernet
32
DWDM
Dense wavelength divison multiplexing
33
To ensure an accurate reading when using a fiber scope, use the correct tip and___
change to the appropriate tip setting in the probe menu
34
Per wavelength what is maximum number of home passed in a fiber deep system?
128
35
IoR
index of refraction
36
uses a high-temperature arc to fuse the fiber ends together for a stronger and more permanent splice than a mechanical splicer can provide
fusion splicer
37
joins the fiber ends inside a plastic tube that mechanically holds the fibers in place
mechanical splice
38
What color is the fiber connector used in FTTP installations?
Green
39
R-ONU
RFoG Optical Network Unit
40
Residential device that supports Comcast EPON
XF3
41
Commercial device that supports Comcast EPON
CFG-3
42
These are protocols that allow back office devices to provision and operate GPON or EPON as if it were a DOCSIS network.
DPoE and DPoG
43
OTDR
optical time domain reflectometer
44
TIR
total internal reflection
45
this type of fiber has multiple fibers arranged in a flat row.
Ribbon Fiber
46
OSS
Operations support system
47
A waveform is typically represented by the Greek letter:
Lamda
48
zero dBW is another way of saying
1 mW
49
GPON uses what type of frames?
GEM frames
50
This LASER has a lower power output and higher dispersion than a DFB LASER
Fabry-Perot
51
EDFAs can boost optical signal as much as
26 dBm
52
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?
25 km
53
dedicated fibers leave a centralized splitter and feed individual customer premises
centralized split architecture
54
RFoG Upstream wavelength
1610 nm or 1310 nm
55
RFoG uses what band for upstream communication
1610 nm
56
The least serious absorption in glass occurs near these wavelengths
1310nm and 1550nm
57
A semiconductor device that converts light into an electrical current
Photodiode
58
This is made of materials that change colors when exposed to light at the wavelengths used for fiber optic communication
photosensitve card
59
ports for connecting fibers that can be found in a Fiber House Box
bulkheads
60
EPON light signal needs to be between ____ and ____
-28.5 and -8 dBm
61
the shorter the wavelength, the ___ the frequency
higher
62
DFB
Distributive Feedback
63
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.
distributed tap architecture
64
EIA/TIA
Electronic Industries Alliance/Telecommunications Industry Association
65
Tool Used to measure the quantity and quality of the signal carried by the fiber
Power Light Meter
66
The bending radius of 3mm fiber optic cable is
1.25 inches
67
This is placed over the fiber prior to splicing
Heat-Shrink Sleeve
68
What type of modulation does RFoG use?
analog intensity modulation
69
Visible light spectrum (in nm.)
750 nm to 380 nm
70
this can be used to test for the presence of light between 850nm to 1550nm
A photosensitve card, or infrared detection card
71
Fiber Deep Upstream Wavelength
1310 nm
72
ODN
Optical distribution network
73
WDM
Wavelength division multiplexing
74
Four types of dispersion
modal, chromatic, waveguide, polarization-mode
75
light propagates inside the core of the fiber by means of
total internal reflection
76
EPON and GPON interface with what in the headend?
Optical Network Terminal
77
Fiber Deep Downstream Wavelength
1550 nm
78
The XF3 will deliver Xfinity services via 3 different methods. what are they?
Wifi, Ethernet, and MoCa
79
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
waveguide dispersion
80
EPON Upstream wavelength
1310 nm
81
EPON Downstream wavelength
1490 nm
82
Power supply used for XF3
12 Volt Power Supply
83
A 64-way optical splitter has approximately how much loss?
22 to 24 dB
84
EPON uses what type of frames?
Ethernet frames
85
traditional HFC upstream range
5 MHz to 42 MHz
86
EDFA
Erbium doped fiber amplifier
87
What types of fibers are generally used where the distances are relatively short?
Multimode fibers
88
3 Elements of Epon
Fiber Delivery XF3 Modem Delivery All IP Video Delivery
89
Dispersion caused by different wavelengths traveling at different velocities causing signal to arrive at different times
Chromatic disperison
90
What is the purpose of a WDM filter in optical power meter or OTDR?
To allow measurements of specific wavelengths when multiple wavelengths are active in the fiber simultaneously
91
acceptable wireless level for Xi5 and Xi6 boxes.
-65 RSSI or better
92
Absorption is what type of loss in fiber
intrinsic loss
93
How many fibers are typically in a bundle or tube?
12
94
a power link between two segments of a network. Those two segments only share the AC power, not the RF signal.
Power Bussing
95
Dispersion due to a larger core allowing light to break up into many different modes or paths
Modal Dispersion
96
What is the minimum voltage needed in order for the node to work?
50 vAC
97
The 3 converters that are compatible with the XF3
Xi5, Xi6, and XiD
98
Three Basic Components of Optical Fiber
protective coating, cladding, core
99
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
Analog Intensity Modulation
100
Color Coding of Fiber Optic Cables
``` Blue Orange Green Brown Slate White Red Black Yellow Violet Rose Aqua ```
101
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?
14 km
102
DPoG
DOCSIS provisioning over Gigabit
103
EPON
Ethernet Passive Optical Network
104
This causes high loss by allowing light to escape from the core into the cladding of the fiber
Macrobend
105
a 32-way optical splitter has approximately how much loss?
18 to 20 dB
106
PON
Passive optical network
107
designed to transport the same radio frequency (RF) signals, such as QAM and analog video, that are carried by conventional HFC networks.
RFoG
108
RFoG
Radio Frequency Over Glass
109
RFoG uses what band for downstream communication?
1550 nm
110
When working with fiber, especially when cutting or splicing, one should work above a slightly adhesive, dark surface called a
tacky mat
111
UPC connectors are what color?
Blue

2018 MM (59 decks)

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