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Network Maintenance > Network Maintenance > Flashcards

Network Maintenance Flashcards

1
Q

This architecture is a combination of fiber optics and coax

A

HFC (Hybrid Fiber Coax)

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2
Q

For the first forty years of CATV, the basic network architecture was known as

A

Tree and branch system

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3
Q

RF

A

Radio frequency

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4
Q

NTSC

A

National Television System Committee

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5
Q

Forward RF frequency allocation begins at

A

50 mhz

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6
Q

Reverse RF frequency allocation is between

A

5 and 42mhz

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7
Q

This device separates forward and reverse signals in an amplifier

A

Diplex filter

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8
Q

The typical cutoff frequency for a sub-split diplex filter is

A

50 mhz

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9
Q

This is the bandwidth required to transmit one analog video program

A

6 mhz

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10
Q

C/N

A

Carrier to noise

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11
Q

The two major types of distortions typically associated with CATV

A

CSO (composite second order) and CTB (composite triple beat)

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12
Q

Broadband cable systems use the spectrum between

A

5 and 1000mhz

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13
Q

What are the two fiber optic transmission wavelengths?

A

1550 and 1310 nanometers

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14
Q

In what spectrum are the fiber wavelengths?

A

Near-infrared

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15
Q

What type of fiber optic cable is used in the broadband industry?

A

Single mode fiber

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16
Q

The process of combining multiple carriers onto a single medium is called

A

Multiplexing

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17
Q

WDM

A

Wave division multiplexing

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18
Q

The three Cs of fiber

A

Core, cladding, coating

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19
Q

The process of combining multiple wavelengths of light on a single single-mode fiber

A

Wave Division Multiplexing (WDM)

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20
Q

DWDM

A

Dense Wave Division Multiplexing

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21
Q

With this technology, lasers at different wavelengths (all near 1550 nm) are combined in a multiplexer, and inserted into an optical fiber

A

Dense Wave Division Multiplexing (DWDM)

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22
Q

The optical link is made up of these three basic parts

A

Fiber optic cable, transmitter (laser), receiver (node)

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23
Q

Fiber optic cable is made up of this kind of glass

A

Silica glass

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24
Q

Three types of optical transmitters typically used in broadband HFC networks

A

Fabry-Perot, Distributed Feedback (DFB), Yttrium-Aluminum-Garnet (YAG)

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25
Q

This component converts incoming light to RF signal

A

Optical receiver or node

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26
Q

FTTF

A

Fiber to the Feeder

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27
Q

In this architecture, the entire coax trunk is replaced with optical fiber

A

Fiber to the Feeder (FTTF)

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28
Q

FTTC

A

Fiber to the Curb

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29
Q

FTTH

A

Fiber to the Home

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30
Q

The transport layer is referred to as this

A

Backbone

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31
Q

In this architecture, each node is connected to the headend over a single path

A

Star architecture

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32
Q

_____ architecture builds a redundant signal path to each node, thus achieving higher reliability.

A

Ring

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33
Q

This architecture adds a second redundant ring connecting nodes to the headend

A

Ring within a ring

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34
Q

OTN

A

Optical Transition Node

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35
Q

In very complex metropolitan networks, these serve as mini-hub locations

A

Optical Transition Nodes (OTNs)

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36
Q

When a RF splitter is used backwards, it becomes this

A

a combiner

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37
Q

A signal’s inability to be transmitted from one cable or device to another cable or device, measured in dB

A

Port-to-Port Isolation

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38
Q

A byte is made up of this many bits

A

Eight

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39
Q

How many bits in a nibble?

A

Four

40
Q

This refers to the number of changed states or “events” that can occur per Hertz (second)

A

Baud

41
Q

What is the baud rate for 256 QAM?

A

8 bits per second

42
Q

DAC

A

Digital to Analog Conversion

43
Q

An ____ signal is a continuous signal or carrier that varies in amplitude or frequency as a function of changes at its input

A

Analog

44
Q

____transmission is a non-continuous signal or carrier that changes its output in discreetly timed steps of voltage level and/or phase that can represent numerical values or other information.

A

Digital

45
Q

ADC

A

Analog to digital conversion

46
Q

The three basic steps of the ADC process are..

A

Sampling, Quantization, Encoding

47
Q

ASK

A

Amplitude Shift Keying

48
Q

FSK

A

Frequency Shift Keying

49
Q

PSK

A

Phase Shift Keying

50
Q

QPSK

A

Quadrature Phase Shift Keying

51
Q

QAM

A

Quadrature Amplitude Modulation

52
Q

BPSK

A

Biphase Shift Keying

53
Q

Phase changes from two to four, at 90, 180, 270, 360 degrees is called…

A

Quadrature PSK or QPSK

54
Q

64 QAM has __ bits per symbol and contains __ symbols per quadrant.

A

6, 16

55
Q

A 256 QAM constellation increases the number of amplitude states to __ and provides __ bits per symbol and contains __ symbols in each quadrant.

A

8, 8, 64

56
Q

TDMA

A

Time Division Multiple Access

57
Q

FEC

A

Forward Error Correction

58
Q

MER

A

Modulation Error Ratio

59
Q

This is the digital equivalent of SNR

A

Modulation Error Ratio (MER)

60
Q

LAN

A

Local Area Network

61
Q

MAN

A

Metropolitan Area Network

62
Q

WAN

A

Wide Area Network

63
Q

____is the method of creating targeted RF-based service groups

A

Narrowcast

64
Q

The three types of network topologies…

A

Star, Bus, Ring

65
Q

A ____ data network connects each of its endpoints to the network with a single link

A

Star

66
Q

The _____ topology consists of several star networks that have been linked together.

A

Clustered Star

67
Q

In ___ topology workstations are connected to the network through a common path or bus.

A

Bus

68
Q

Two methods of digital transport

A

Asynchronous, synchronous

69
Q

____________ transmission allows characters to be sent at irregular intervals by preceding each character with a start bit and following it with a stop bit

A

Asynchronous

70
Q

In ________ transmission, more information is sent in less time because there are no start and stop bits being sent with each piece of data

A

Synchronous

71
Q

SNMP

A

Simple Network Management Protocol

72
Q

MIB

A

Management Information Base

73
Q

10BaseT has a signaling rate of ___ megabits per second

A

10

74
Q

100 BaseT, also known as fast Ethernet, has a signaling rate of ___ megabits per second

A

100

75
Q

UTP

A

Unshielded Twisted Pair

76
Q

IP

A

Internet Protocol

77
Q

IEEE

A

Institute of Electronic and Electrical Engineering

78
Q

DOCSIS

A

Data Over Cable Service Interface Specification

79
Q

CMTS

A

Cable Modem Termination System

80
Q

CMTS’ usually transmit at either __ QAM or ___ QAM

A

64, 256

81
Q

Modem

A

Modulate, Demodulate

82
Q

NIC

A

Network Interface Card

83
Q

DHCP

A

Dynamic Host Configuration Protocol

84
Q

TOD

A

Time of Day Server

85
Q

TFTP

A

Trivial File Transfer Protocol

86
Q

This filter only allows signals above 50 mhz to pass through

A

High Pass Filter

87
Q

This filter allows everything above 50mhz to pass along with a small spectrum below 50 mhz to pass

A

Band Pass Filter

88
Q

POP

A

Point of Presence

89
Q

EPON

A

Ethernet Passive Optical Network

90
Q

NAP

A

Network Access Point

91
Q

PSTN

A

Public Switched Telephone Network

92
Q

HDT

A

Host Digital Terminal

93
Q

ABM

A

Access Bandwidth Manager

94
Q

NIU

A

Network Interface Unit

95
Q

LPSU

A

Local Power Supply Unit

Network Maintenance (1 decks)

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