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RCDD > TDMM Chapter 11 > Flashcards

TDMM Chapter 11 Flashcards

1
Q

ACR-F

A

Attenuation to Crosstalk Ratio - Far End
Performance parameter based on a crosstalk measured on a disturbed pair at the opposite end from which the disturbing signal is transmitted and normalized by the attenuation loss of the disturbed wire pair

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2
Q

ACR-N

A

Attenuation to Crosstalk Ratio - Near End
The ratio between the signal strength arriving at the end of a link and the disturbance casued by the NEXT coupling from a disturbing wire pair

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3
Q

Attenuation

A

Decrease in magnitude of power of a transmitted signal between two points
Expresses the loss of optical fiber cabling

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4
Q

CP

A

Consolidation Point
Interconnection for cables for horizontal cabling to furniture pathways

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5
Q

Delay Skew

A

Difference in propagation delay between fastest and slowest pairs in same cable sheath

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6
Q

EMI

A

Electromagnetic Interference
Energy that has an undesirable effect on signal or transmission

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7
Q

Fresnel Reflection

A

Whenever light travelling in material encounters a different density material, some is reflected back to source

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8
Q

Insertion Loss

A

Loss in signal from insertion of a component, link or channel

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9
Q

Insertion Loss Deviation

A

Difference between expected and actual insertion loss

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10
Q

MUTOA

A

Multi User Teelcom Outlet Assembly
A grouping in one location of serveral telecom outlets

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11
Q

NEXT

A

Near End Crosstalk
A measure of the signal coupling between any two pairs along the entire length of a balanced twisted pair cable

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12
Q

NVP

A

Nominal Velocity of Propagation
Determines speed of transmission along a cable relative to speed of light

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13
Q

OTDR

A

Optical Time Domain Reflectometer
Tool that measures transmission characteristics of opetical fiber

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14
Q

PSAACRF

A

Power Sum Attenuation to Alien Crosstalk Ratio at Far End
A ratio in decibels that subtracts attenuation from PSAFEXT betweeen close cables

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15
Q

PSAACRN

A

Power Sum Attenuation to Alien Crosstalk Ratio at Near End
A ratio in decibels that subtracts attenuation from PSANEXT betweeen close cables

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16
Q

PSACR

A

Power Sum Attenuation to Crosstalk Ratio
A ratio in decibels that subtracts attenuation from PSNEXT loss

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17
Q

PSACRF

A

Power Sum Attenuation to Crosstalk Ratio Far End
A computation of unwated signal coupling from multiple transmitters at the near end into a pair measured at the far end

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18
Q

PSANEXT

A

Power Sum Alien Near End Crosstalk
The power sum of unwanted signal coupling from multiple disturbing end crosstalk pairs

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19
Q

Propagation Delay

A

Measurement of the time required for signal to travel from one end of the transmission path of the other end

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20
Q

Rayleigh Scattering

A

Scattering of light as it travels along an optical fiber

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21
Q

Return Loss

A

Measurement of the reflection of signal power resulting from the insertion of a device in a transmission line

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22
Q

SNR

A

Signal to Noise Ratio
The ratio between the amount of signal and noise

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23
Q

TDR

A

Time Domain Reflectometer
A testing device to measure length of cable and locate faults

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24
Q

What is required to perform field testing?

A
  • Set of measurable transmission performance parameters
  • necessary field test instruments
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25
Q

What should you do in situations where there are no predefined testing requirements for field testing?

A

Use the most applicable standard

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26
Q

What does a wire map test determine?

A

If the individual conductors in the cabling are connected correctly

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27
Q

Name seven errors that can be detected during a wire map test

A
  • Continuity
  • Shorts between conductors
  • Transposed pairs
  • Reversed pairs
  • Split pairs
  • Shield continuity
  • Grounded conductor
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28
Q

True or False
Direct current loop resistance is required as an acceptance test for balanced twisted pair cabling

A

False

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29
Q

True or False
Characteristic impedance is not required as an acceptance test for balanced twisted pair cabling

A

True

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30
Q

What method is used to calculate the length of a balanced twisted pair cable?

A

The TDR method

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31
Q

What formula is used to calculate the maximum permissible length for a channel or permanent link?

A

(NVP x (round trip delay) x c x 110%) / 2

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32
Q

Name three variations in balanced twisted pair cable that can result in different propagation delays in the cable pairs

A
  • Different twist rates
  • Slightly different electrical characteristics
  • Different dielectric materials
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33
Q

True or False
If a field test instrument uses the same NVP for all pairs in a balanced twisted pair cable, the reported length will be the same for each pair

A

False

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34
Q

What term refers to the time required for a signal to travel from one end of the transmission path to the other end?

A

Propagation Delay

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35
Q

What term describes the difference in propagation delay between the fastest and slowest pairs within the same cable sheath?

A

Delay Skew

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36
Q

What is the relationship between insertion loss in decibels and system performance?

A

The smaller the loss in decibels, the better the performance

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37
Q

What ratio is used to determine return loss?

A

The ratio of the reflected voltage to the incident signal voltage

38
Q

What term is used to describe a ripple that appears in the curve when attenuation loss is plotted with frequency?

A

Insertion loss deviation

39
Q

True or False
Insertion loss deviation is not required as an acceptance test

A

True

40
Q

What is the relationship between the value of ACR-F in decibels and the performance of the cable link?

A

The higher the decibel level, the better the performance of the installed cable link

41
Q

What does power sum crosstalk specify?

A

A combination of crosstalk from every source

42
Q

What term refers to noise that is caused by adjacent data communication cables in the same bundle?

A

Alien Crosstalk

43
Q

How are noise tests useful?

A

Troubleshooting problematic links or channels

44
Q

Name two test parameters used to capture alien crosstalk coupling

A
  • PSANEXT
  • PSAACR-F
45
Q

What types of faults are TDRs primarily used to identify?

A

Return Loss failures

46
Q

Name the three configurations used for field testing horizontal balanced twisted pair cabling

A
  • Channel
  • Permanent Link
  • Modular Plug Terminated Link (MPTL)
47
Q

What does BICSI recommend take place before a permanent link is tested?

A
  • Cable should be in place
  • Both ends terminated
  • Outlets in place
48
Q

What is the ambient temperature used by field testing equipment?

A

68 F

49
Q

What is the defined tester accuracy level for Category 5E (Class D) cable?

A

Level lle

50
Q

What is the defined tester accuracy level for Category 6 (Class E) cable?

A

Level lll

51
Q

What is the defined tester accuracy level for Category 6A (Class EA) cable?

A

Level llle

52
Q

True or False
There are no defined accuracy levels for field testers to cover the requirements for class F products

A

True

53
Q

What does a power sum measurement assume?

A

That all cables contribute to crosstalk

54
Q

What is a bundled cable?

A

An assembly of two or more cables

55
Q

Name two tests for backbone cable that exceeds horizontal length limits

A
  • Continuity
  • Wiremap
56
Q

What type of testing requirements are used when field testing MUTOAs and CPs

A

Permant Link requirements

57
Q

What should be used to demonstrate shield effectiveness of installed shielded cabling systems?

A

Alien Crosstalk test procedures

58
Q

Name two applications for coaxial cabling

A
  • Broadband applications
  • Local area Networks (LANS) (legacy)
59
Q

Name five types of tests that are performed on coaxial installations

A
  • Direct current loop resistance
  • Impedance
  • Length
  • TDR
  • Noise
60
Q

What type of coaxial cabling is the primary type of cabling used in distributed antenna systems?

A

50 ohm air dielectric coxial cable

61
Q

Name the five functions that a 50 ohm cable tester can perform

A
  • Continuity
  • Attenuation
  • TDR Impedance
  • Voltage standing radio wave
  • Provide pass or fail results
62
Q

Which testing tool can be used to help identify areas that may need additional antennas to provide successful coverage?

A

Spectrum Analyzer

63
Q

What term is used to describe loss in an optical fiber cable?

A

Attenuation

64
Q

What is the recommended method for testing optical fiber attenuation?

A

Light source and power meter

65
Q

What type of tester should be used to determine the length of an optical fiber cable?

A

OTDR

66
Q

Name two methods for verifying polarity for an optical fiber cable

A
  • OLTS
  • Visible light source
67
Q

What can result in the OTDR underestimating the loss for connectors and splices?

A

OTDR will underestime loss if it has an under-filled launch

68
Q

How many cable ends need to be accessible to perform a test with an OTDR?

A

1

69
Q

What is the purpose of using a launch cord with an OTDR?

A

Helps measure the insertion loss and reflectance of the first connection

70
Q

What is the relationship between the length of a wavelength and the slope of a trace produced by an OTDR?

A

Shorter wavelengths produce a steeper slope

71
Q

Name three measurements used for the minimum level of acceptance testing for optical fiber cabling

A
  • Attenuation
  • Length
  • Polarity
72
Q

Which reference method has the lowest level of uncertainty?

A

The one jumper reference method has the lowest level of uncertainty

73
Q

How should premises optical fiber cable links be tested?

A
  • Bidirectionally
  • At their two corresponding wavelengths
74
Q

What formula is used to calculate link attenuation?

A

Link Attenuation =
Cable Attenuation
+
Connector Attenuation
+
Splice Attenuation

75
Q

What formular is used to calculate cable attenuation?

A

Cable Attenuation =
Attenuation Coefficient (dB/km)
x
Length

76
Q

What formula is used to calculate connector attenuation?

A

Connector Attenuation (dB) =
Number of Connector Pairs (N)
x
Connector Loss (dB)

77
Q

What foruma is used to calculate splice attenuation?

A

Splice Attenuation (dB) =
Number of Splices (S)
x
Splice Loss (dB)

78
Q

What is the purpose of cable reel acceptance testing?

A

To ensure that the optical fiber cable is in good condition after the inventory, handling and shipping process

79
Q

When does cable reel acceptance testing take place?

A

Within five working days of delivery

80
Q

Why should the OLTS be allowed to normalize to the ambient temperature of the testing area before performing the test?

A

Helps to ensure consistent and repeatable results

81
Q

What does the attenuation test measure?

A

Optical power loss between cable termination points

82
Q

What are common issues that will result in system loss measurements being higher than the calculated link loss budget?

A
  • Dirty connector end faces
  • Connector issue
  • Severe bend in cable
83
Q

Where is end to end attenuation measured for multimode optical fiber cable?

A

At 850 nm and 1300 nm

84
Q

Where is end to end attenuation measured for singlemode optical fiber cable?

A

At 1310 nm and 1550 nm

85
Q

How long does the launch cord need to support and ODTR test?

A

Long enough to overcome the dead zone for the optical pulse width used

86
Q

Name two simple safeguards that can be used to prevent service disruption in an optical fiber system

A
  • Ensure connector care and cleanliness
  • Check protection of system jumpers
87
Q

Name four components that should be used to troubleshoot and restore optical fiber service as quickly as possibly

A
  • Documentation
  • Inspection and cleaning rating
  • Test Equipment
  • Troubleshooting plan
88
Q

What is a potential issue with used wireless devices to communicate during testing?

A

Wireless devices may cause intereference with the first test instrument

89
Q

How is a visible light source used?

A

To test and troubleshoot continuity of fiber

90
Q

What happens if a tech uses a visual fault indicator to test a broken fiber cable?

A

The break will glow red during test

91
Q

Describe how a strand identifier works

A

Inserts a macrobend into the fiber, allowing light escaping the cable to be detected

RCDD (19 decks)

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