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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
This component converts incoming light to RF signal
Optical receiver or node
26
FTTF
Fiber to the Feeder
27
In this architecture, the entire coax trunk is replaced with optical fiber
Fiber to the Feeder (FTTF)
28
FTTC
Fiber to the Curb
29
FTTH
Fiber to the Home
30
The transport layer is referred to as this
Backbone
31
In this architecture, each node is connected to the headend over a single path
Star architecture
32
_____ architecture builds a redundant signal path to each node, thus achieving higher reliability.
Ring
33
This architecture adds a second redundant ring connecting nodes to the headend
Ring within a ring
34
OTN
Optical Transition Node
35
In very complex metropolitan networks, these serve as mini-hub locations
Optical Transition Nodes (OTNs)
36
When a RF splitter is used backwards, it becomes this
a combiner
37
A signal’s inability to be transmitted from one cable or device to another cable or device, measured in dB
Port-to-Port Isolation
38
A byte is made up of this many bits
Eight
39
How many bits in a nibble?
Four
40
This refers to the number of changed states or “events” that can occur per Hertz (second)
Baud
41
What is the baud rate for 256 QAM?
8 bits per second
42
DAC
Digital to Analog Conversion
43
An ____ signal is a continuous signal or carrier that varies in amplitude or frequency as a function of changes at its input
Analog
44
____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.
Digital
45
ADC
Analog to digital conversion
46
The three basic steps of the ADC process are..
Sampling, Quantization, Encoding
47
ASK
Amplitude Shift Keying
48
FSK
Frequency Shift Keying
49
PSK
Phase Shift Keying
50
QPSK
Quadrature Phase Shift Keying
51
QAM
Quadrature Amplitude Modulation
52
BPSK
Biphase Shift Keying
53
Phase changes from two to four, at 90, 180, 270, 360 degrees is called...
Quadrature PSK or QPSK
54
64 QAM has __ bits per symbol and contains __ symbols per quadrant.
6, 16
55
A 256 QAM constellation increases the number of amplitude states to __ and provides __ bits per symbol and contains __ symbols in each quadrant.
8, 8, 64
56
TDMA
Time Division Multiple Access
57
FEC
Forward Error Correction
58
MER
Modulation Error Ratio
59
This is the digital equivalent of SNR
Modulation Error Ratio (MER)
60
LAN
Local Area Network
61
MAN
Metropolitan Area Network
62
WAN
Wide Area Network
63
____is the method of creating targeted RF-based service groups
Narrowcast
64
The three types of network topologies...
Star, Bus, Ring
65
A ____ data network connects each of its endpoints to the network with a single link
Star
66
The _____ topology consists of several star networks that have been linked together.
Clustered Star
67
In ___ topology workstations are connected to the network through a common path or bus.
Bus
68
Two methods of digital transport
Asynchronous, synchronous
69
____________ transmission allows characters to be sent at irregular intervals by preceding each character with a start bit and following it with a stop bit
Asynchronous
70
In ________ transmission, more information is sent in less time because there are no start and stop bits being sent with each piece of data
Synchronous
71
SNMP
Simple Network Management Protocol
72
MIB
Management Information Base
73
10BaseT has a signaling rate of ___ megabits per second
10
74
100 BaseT, also known as fast Ethernet, has a signaling rate of ___ megabits per second
100
75
UTP
Unshielded Twisted Pair
76
IP
Internet Protocol
77
IEEE
Institute of Electronic and Electrical Engineering
78
DOCSIS
Data Over Cable Service Interface Specification
79
CMTS
Cable Modem Termination System
80
CMTS’ usually transmit at either __ QAM or ___ QAM
64, 256
81
Modem
Modulate, Demodulate
82
NIC
Network Interface Card
83
DHCP
Dynamic Host Configuration Protocol
84
TOD
Time of Day Server
85
TFTP
Trivial File Transfer Protocol
86
This filter only allows signals above 50 mhz to pass through
High Pass Filter
87
This filter allows everything above 50mhz to pass along with a small spectrum below 50 mhz to pass
Band Pass Filter
88
POP
Point of Presence
89
EPON
Ethernet Passive Optical Network
90
NAP
Network Access Point
91
PSTN
Public Switched Telephone Network
92
HDT
Host Digital Terminal
93
ABM
Access Bandwidth Manager
94
NIU
Network Interface Unit
95
LPSU
Local Power Supply Unit

Network Maintenance (1 decks)

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