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Dan2024 Study > NCT4/5 10-17-18BH > Flashcards

NCT4/5 10-17-18BH Flashcards

1
Q

data transmission scheme wherein the carrier is shifted in amplitude

A

ASK (amplitude shift keying)

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2
Q

a continuously varying signal with an unlimited number of possible values of amplitude and frequency

A

analog signals

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3
Q

8-12 degree angled cut end

A

APC (angled polish connector)

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4
Q

allows characters to be sent at irregular intervals by preceding each character with a 0 and a 1 (start=0 stop=1) method used by most pc’s to communicate with each other and mainframes

A

Asynchronous

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5
Q

the difference between transmitted and received power resulting from the loss through equipment, lines, or other transmission devices. usually expressed in dB

A

attenuation

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6
Q

a circuit that automatically adjusts the gain of an amplifier so that the output signal levels stay constant despite varying input levels

A

AGC (automatic gain control)

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7
Q

high speed line or series of connections that forms a Major Pathway within a network

A

Backbone

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8
Q

light that is reflected back to the source and contributes to the optical fiber loss

A

Backscattered light

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9
Q

Number of changed states that can occur per second

A

baud

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10
Q

smallest unit of computerized data

A

Binary digit (Bit)

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11
Q

constrained to have 2 states (on and off)

A

binary format

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12
Q

a set of bits that represent a single character

A

Byte

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13
Q

device that scores and then breaks the optial fiber

A

Cleaver

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14
Q

a clustering of beats 1.25Mhz above the visual carriers

A

CSO (composite 2nd order)

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15
Q

a form of interference or noise resulting from the mixing of all of the various carriers in a CATV network

A

CTB (composite triple beat)

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16
Q

a graphic depiction of the 4 phase states of a Quadrature Phase Shift Key signal

A

constellation diagram

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17
Q

a stream of atomic nuclei that enters the earths atmosphere from outer space at speeds approaching that of light

A

cosmic rays

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18
Q

device that converts an amount of light to a power level

A

detector

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19
Q

separates or combines based on frequency

A

diplex filter

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20
Q

3 types of optical power meters

A
  1. silicon (si)
  2. Germanium (Ge)
  3. indium-gallium arsenide (InGAAs)
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21
Q

an extra bit added to help check if the data being transferred is correct

A

Parity Bit

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22
Q

used to detect light from an optical fiber and convert the light to an electrical source

A

Photodiode

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23
Q

provision for connection to a device such as a tap, splitter, stb, or computer

A

Port

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24
Q

an alternate feed used as a backup. contains the same info as the primary configuration but is routed in a different path

A

Redundant

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25
Q

the ratio of the velocity of light of 2 mediums of optical glass

A

Refractive index

26
Q

device used to wrap and store excess fiber in an aerial location

A

snowshoe

27
Q

a cabinet or rack that houses the splices of the outside plant fiber to the inside head end, node, or OTN fiber

A

Splice Panel

28
Q

noise caused by inherent instabilities within the laser

A

RIN (relative intensity noise)

29
Q

the part of the packet that contains the data being sent

A

payload

30
Q

YEDFA

A

ytterbium erbium doped fiber amplifier

31
Q

distance between 2 points of like phase in a wave

A

wavelength

32
Q

violet wavelength

A

455nM

33
Q

blue wavelength

A

480nM

34
Q

green wavelength

A

550nM

35
Q

red wavelength

A

750nM

36
Q

light escapes from the core into the cladding

A

macrobend

37
Q

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

A

microbend

38
Q

directly encodes digital 1’s and 0’s as pulses of light

A

baseband digital modulation

39
Q

varying the intensity of the light in direct proportion to the analog electrical signal that is applied to the optical transmitter

A

analog intensity modulation

40
Q

spreading in time (t) of an optical signal as it travels through the fiber

A

dispersion

41
Q

common dispersion in multi mode fiber

A

Modal dispersion

42
Q

small amount of light travels through the interface between the core and cladding, this light travels faster than the light in the core

A

Waveguide dispersion

43
Q

PMD

A

polarization mode dispersion

44
Q

2 forms of attenuation in the fiber manufacturing process

A

scattering and absoption

45
Q

light directed back to the input of the fiber

A

back scattering

46
Q

angle of incidence greater than the critical angle creates

A

total internal reflection

47
Q

loss of optical energy due to the imperfections in the fiber

A

scattering

48
Q

MPEG format compresses video information by reducing

A

temporal redundancies

spatial redundancies

49
Q

2 types of cipher algorithms

A

symmetric key

asymmetric key

50
Q

2 common forms of multiplexing

A

time division

statistical (DVB standard, statmux)

51
Q

redundant information in a single frame

A

temporal redundancies

52
Q

redundant information spanning multiple frames

A

spatial redundancies

53
Q

3 signs of a failing diplex filter

A

drifting
roll off
phase delay

54
Q

common causes of micro reflections

A 
damaged or missing terminators
water filled taps
kinked or damaged cables
damaged splitters
cpe
55
Q

NCPdb

A

node combining plan database

56
Q

name 4 linear distortions

A 
micro reflections
amplitude ripple
group delay
jitter
notches
57
Q

FM radio freq allocation

A

88-108Mhz

58
Q

UHF ch 14-83 freq allocation

A

470-890 Mhz

59
Q

VHF ch 7-13 freq allocation

A

174-216 Mhz

60
Q

cellphone freq allocation

A

824.040-848.970 Mhz

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