NCT4/5 10-17-18BH

Question 1

data transmission scheme wherein the carrier is shifted in amplitude

Answer 1

ASK (amplitude shift keying)

Question 2

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

Answer 2

analog signals

Question 3

8-12 degree angled cut end

Answer 3

APC (angled polish connector)

Question 4

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

Answer 4

Asynchronous

Question 5

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

Answer 5

attenuation

Question 6

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

Answer 6

AGC (automatic gain control)

Question 7

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

Answer 7

Backbone

Question 8

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

Answer 8

Backscattered light

Question 9

Number of changed states that can occur per second

Answer 9

baud

Question 10

smallest unit of computerized data

Answer 10

Binary digit (Bit)

Question 11

constrained to have 2 states (on and off)

Answer 11

binary format

Question 12

a set of bits that represent a single character

Answer 12

Byte

Question 13

device that scores and then breaks the optial fiber

Answer 13

Cleaver

Question 14

a clustering of beats 1.25Mhz above the visual carriers

Answer 14

CSO (composite 2nd order)

Question 15

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

Answer 15

CTB (composite triple beat)

Question 16

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

Answer 16

constellation diagram

Question 17

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

Answer 17

cosmic rays

Question 18

device that converts an amount of light to a power level

Answer 18

detector

Question 19

separates or combines based on frequency

Answer 19

diplex filter

Question 20

3 types of optical power meters

Answer 20

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

Question 21

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

Answer 21

Parity Bit

Question 22

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

Answer 22

Photodiode

Question 23

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

Answer 23

Port

Question 24

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

Answer 24

Redundant

Question 25

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

Answer 25

Refractive index

Question 26

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

Answer 26

snowshoe

Question 27

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

Answer 27

Splice Panel

Question 28

noise caused by inherent instabilities within the laser

Answer 28

RIN (relative intensity noise)

Question 29

the part of the packet that contains the data being sent

Answer 29

payload

Question 30

YEDFA

Answer 30

ytterbium erbium doped fiber amplifier

Question 31

distance between 2 points of like phase in a wave

Answer 31

wavelength

Question 32

violet wavelength

Answer 32

455nM

Question 33

blue wavelength

Answer 33

480nM

Question 34

green wavelength

Answer 34

550nM

Question 35

red wavelength

Answer 35

750nM

Question 36

light escapes from the core into the cladding

Answer 36

macrobend

Question 37

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

Answer 37

microbend

Question 38

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

Answer 38

baseband digital modulation

Question 39

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

Answer 39

analog intensity modulation

Question 40

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

Answer 40

dispersion

Question 41

common dispersion in multi mode fiber

Answer 41

Modal dispersion

Question 42

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

Answer 42

Waveguide dispersion

Question 43

PMD

Answer 43

polarization mode dispersion

Question 44

2 forms of attenuation in the fiber manufacturing process

Answer 44

scattering and absoption

Question 45

light directed back to the input of the fiber

Answer 45

back scattering

Question 46

angle of incidence greater than the critical angle creates

Answer 46

total internal reflection

Question 47

loss of optical energy due to the imperfections in the fiber

Answer 47

scattering

Question 48

MPEG format compresses video information by reducing

Answer 48

temporal redundancies | spatial redundancies

Question 49

2 types of cipher algorithms

Answer 49

symmetric key | asymmetric key

Question 50

2 common forms of multiplexing

Answer 50

time division | statistical (DVB standard, statmux)

Question 51

redundant information in a single frame

Answer 51

temporal redundancies

Question 52

redundant information spanning multiple frames

Answer 52

spatial redundancies

Question 53

3 signs of a failing diplex filter

Answer 53

drifting roll off phase delay

Question 54

common causes of micro reflections

Answer 54

``` damaged or missing terminators water filled taps kinked or damaged cables damaged splitters cpe ```

Question 55

NCPdb

Answer 55

node combining plan database

Question 56

name 4 linear distortions

Answer 56

``` micro reflections amplitude ripple group delay jitter notches ```

Question 57

FM radio freq allocation

Answer 57

88-108Mhz

Question 58

UHF ch 14-83 freq allocation

Answer 58

470-890 Mhz

Question 59

VHF ch 7-13 freq allocation

Answer 59

174-216 Mhz

Question 60

cellphone freq allocation

Answer 60

824.040-848.970 Mhz