Bicsi Installer 2 Copper Chapter 1

Front 1

_______ transmits signals in one direction only. The listener has no path to respond.

Back 1

Simplex 1-1

Front 2

______ transmits signals in either direction but in only one direction at a time. This transmission reguires a "Push to Talk" switch.

Back 2

Half-duplex 1-1

Front 3

_______ transmits signals in both directions at the same time. Both parties to talk simultaneously.

Back 3

Full duplex 1-1

Front 4

Radiated or conducted electromagnetic energy that has an undesirable effect on electronic equipment or signal transmissions.

Back 4

Electromagnetic Interference (EMI) G-20

Front 5

Category 3

Back 5

Class C 1-2

Front 6

Category 5e

Back 6

Class D 1-2

Front 7

Category 6

Back 7

Class E 1-2

Front 8

Category 6A

Back 8

Class EA 1-2

Front 9

Category 7

Back 9

Class F 1-2

Front 10

Category 7A

Back 10

Class FA 1-2

Front 11

Twisted-pair cable is called_______ because the physical construction of both conductors is at the same potential.

Back 11

Balanced cable 1-2

Front 12

Coaxial cable is ______ becausce the two conductors are at different potential.

Back 12

unbalanced cable 1-2

Front 13

_____ is a measure of electrical service consumption that a given device is designed to accept.

Back 13

Peak Power 1-3

Front 14

A device that is inserted between a primary source and the primary power input of equipment to be protected to eliminte the effects of transient anomalies or temporary outages.

Back 14

uninterruptible power supply (UPS) G-59

Front 15

North America is ___ Hz.

Back 15

60 Hz 1-3

Front 16

Rest of the world has _____ Hz.

Back 16

50 Hz 1-3

Front 17

You must comfirm the standaed freguency for the region with the _____________.

Back 17

Authority having jurisdiction (AHJ) 1-3

Front 18

__________ refers to a steady value that does not change the polarity of the voltage or the direction of the current.

Back 18

Direct Current (dc) 1-3

Front 19

A ____ is an example of a dc source.

Back 19

Battery 1-3

Front 20

What can cause signal corruption, component malfunction, equipment failure, property damage, injury to personnel and loss of life in the case of extreme exporure.

Back 20

Electromagnetic Interference (EMI) and Radio frequency interference (RFI)

Front 21

_________ is the ramdom, unwanted energy that is coupled into a conductor or circuit from an external source.

Back 21

Electromagnetic Interference (EMI) 1-4

Front 22

____ is a disturbance in the reception of radio and other electromagnetic signals because of conflict with undesired signals.

Back 22

Radio frequency interference 1-4

Front 23

Any dc magnetic fields greater than 500 milligauss (mG) may create image distortion on __________. And may need to be properly shielded in order to reduce or eliminates disortion.

Back 23

Video display terminal (VDT) 1-5

Front 24

Sources that create strong dc magnetic fields include _________.

Back 24

Magnetic resonance imaging (MFI) 1-5

Front 25

Image distartion on a VDT also can be caused by ac __________ as low as 5 mG. And caused by circuit conductors being unduly seperared (high current) and fields cased bu grounded conductors being unduly paralleled (net current).

Back 25

Electromagentic fields (EMF) 1-5

Front 26

An environmentally controlled centalized space for telecommunictions equipment that usually houses a main or imtermediate coross-connect.

Back 26

Equipment Room (ER) G-21

Front 27

Electrical code violations can cause return curren to travel on _________ conductors throughout the buliding.

Back 27

grounding (earthing) 1-5

Front 28

It is important to minimize the chance of interference between __________________.

Back 28

Installed equipment, supporting infrastructure and interconnecting cabling. 1-5

Front 29

In the Equipment room, Electromagnetic Interference can ___________________________.

Back 29

couple itself onto telecommunications circuits and corrupt data packets being trasmitted on that medium. Also cause corruption of the data being transmitted and stored. 1-5

Front 30

_________ is defined as the number of cycles a signal is repeated in a given time period.

Back 30

Frequency 1-6

Front 31

Humans can hear frequencies that range from ________.

Back 31

20 Hz to 20,000 Hz 1-6

Front 32

Typical voice grade electrical transmission is generally limited to _____________.

Back 32

100 to 4000 Hz 1-6

Front 33

Transmission of speech is generally limited to________.

Back 33

300 Hz to 3400 Hz 1-6

Front 34

________ is the information carrying capcity of a system.

Back 34

Bandwidth 1-6

Front 35

1. A range of frequencyies available for signaling expressed in hertz. 2. The information handling capability of a medium, expressed in unit of frequency.

Back 35

Bandwidth G-5

Front 36

The information transmitted by a telecommunications system can originate in two fundamental forms ________ __________.

Back 36

Analog and Digital 1-6

Front 37

_________ is represented by the continuous variation of the message.

Back 37

Analog Signal 1-6

Front 38

_______ is a discontinuous signal that changes from one state to another in a number os sisinct step within fixed bit framing time slots.

Back 38

Digital Signal 1-7

Front 39

The basic unit of digital information is a _______. It is used to indicate the existence of two (binary) states of conditions (on or off).

Back 39

Bit 1-7

Front 40

Base voltage is often shown on graphs as a zero reference voltage for simplicity, but it is acually a continuous current flow of a known and very stable voltage level of __________.

Back 40

24 V and 48 V 1-7 Note: it says it is common.

Front 41

The transmission of digital data can be accomplished on a direct digital basis over a digital curcuit or it can be converted to an analog signal with a __________. Can convert the digital signal's 1s and 0s into two distinict analog frequencies.

Back 41

Modulator/Demodulator (Modem) 1-8

Front 42

The transmission of analog data can be converted from aanalog format to digital with a _______________. These can convert the amplitude changes of various frequencies into a digital format for transmission over digital transmistion media.

Back 42

Coder/decoder (Codec) 1-8

Front 43

The most common process for voice conversion is called _________. All carries use this method.

Back 43

Pulse Code Modulation (PCM) 1-8

Front 44

PCM samples the analog voice signal 8000 times per second to create a digital voice channel of ___________.

Back 44

64,000 bits per second 1-8

Front 45

The local loop of the ____________ was initially designed to carry plain old telephone service voice communication and signaling.

Back 45

Public switched telephone network (PSTN) 1-9

Front 46

What does POTS stand for?

Back 46

Plain Old Telephone Service 1-9

Front 47

The plain old telephone service signal range is transmitted between __________.

Back 47

300 to 3400 Hz 1-9

Front 48

A type of digital technology designed to use existing cabling to support high data transfer tate application.

Back 48

Digital Subscribler Line (DSL) G-18

Front 49

________ is one form of DSL technology, which allows faster data transmission over balanced twisted-pair cabling.

Back 49

Asymmetric Digital Subscriber Line (ADSL) 1-9

Front 50

Traditional dial-up modems modulate signals in the __________.

Back 50

300-3400 Hz baseband 1-9

Front 51

DSL modems modulates frequencies from __________.

Back 51

4000 Hz to as high as 4 MHz 1-9

Front 52

Transmission characteristics and testing frequency range must be unterstood by the____________.

Back 52

ITS technician 1-9

Front 53

________ quantifes the band width of a cabling system in a frequency rage of interest (e.g. 1-1000 MHz category 7A/ class FA cabling. And relates to the information handling capability of the media.

Back 53

Megahertz 1-10

Front 54

_________ refers to the numer of bits of information that can be transported over the media.

Back 54

Megabit 1-10

Front 55

A measure of analog signal strength is a ___.

Back 55

Bel 1-10

Front 56

The _______ is a logarithmic function that allows large veriations to be shown in very small increments.

Back 56

Decibel 1-10

Front 57

Increase or decrease of 10dB will cause an increase or decrease of ______________.

Back 57

10 times the original value 1-10

Front 58

Crosstalk

Back 58

The higher the decibel value, the better 1-10

Front 59

Insertion loss (Measured attenuation)

Back 59

The lower the decibel value, the better. 1-10

Front 60

Return Loss

Back 60

The higher the decibel, the berrter 1-10

Front 61

In American Wire Gauge (AWG), the smaller numbers____.

Back 61

demote larger wires 1-11

Front 62

In American Wire Gauge (AWG), the larger numbers _______.

Back 62

denote smallers wire 1-11

Front 63

A gauge change of 3 approximately doubles or halves the conductor's _______.

Back 63

Cross-sectional area and resistance 1-11

Front 64

A gauge change of 6 approximately doubles or halves the conductor's_______.

Back 64

Diameter

Front 65

________ is the property of a conductor to resist the flow of electricity through it.

Back 65

Resistance 1-12

Front 66

Resistance is expressed or measured in ______.

Back 66

Ohms 1-12

Front 67

_________ is a property of an electrical force field around a conductor that opposes any changes in current flow in a circuit both ac and verying dc.

Back 67

Inductance 1-13

Front 68

The basic unit of inductance is ______.

Back 68

Henry (H) 1-13

Front 69

________ is a property of conductiors that allows storage of electric charges when potential drffernces exist between the conductors.

Back 69

Capacitance 1-14

Front 70

Capacitance is measured in ______.

Back 70

Farads 1-14

Front 71

In ac circuits, the tatal opposition to current flow is called _______. This is the combined effects of resistance, inductance and capacitance of the circuit.

Back 71

Impedance 1-14

Front 72

The capacitance between two conductors.

Back 72

Mutual Capacitance 1-14

Front 73

The capacitance between a conductor and ground.

Back 73

Unbalanced capacitance 1-14

Front 74

The value of the characteristic impedance is detemined by the:

Back 74

Metallic material and the diameter of the conductors.

Distance between the conductors

Insulating value of the meterials separating them.

Front 75

____ is a ratio expressed indecibels of the power of the outgoing signal to the power of the relected signal.

Back 75

Return Loss 1-15

Front 76

The signal loss resulting from the insertion of a component, or link, or channel, between transmitter and receiver.

Back 76

Insertion Loss G-30

Front 77

The decrease in magnitude of transmission signal strength between ponts expressed in dcibels as the ratio of output to input signal level.

Back 77

Attenuation G-4

Front 78

The unwanted transfer of a signal's electtomagnetic energy from one or more circuits to other circuits called _______

Back 78

Crosstalk 1-16

Front 79

Three basic types of crosstalk are:

Back 79

Near-end crosstalk (NEXT)

Par-end crosstalk (FEXT)

Alien crosstalk (NEXT) 1-16

Front 80

_____ is mearsure of the unwanted signal coupling from a transmitter at the near end into another pair measured at the near end.

Back 80

Near-End Crosstalk (NEXT) 1-16

Front 81

______ is a measure of the unwanted signal coupling from a transmitter at the near end into a neighboring parit measured at the far end.

Back 81

Far-End Crosstalk (FEXT) 1-16

Front 82

Attenuation-to-crosstalk ratio far-end (ACTF) formerly referred to as _____.

Back 82

Equal Level Far-End Crosstalk (ELFEXT) 1-17

Front 83

______ is the unwanted signal coupling from a disturbing pair of a 4-pair cable channel, permanent link, or component to a disturbed pair of another 4-pair channel, permanent link. or component.

Back 83

Alien Crosstalk (AXT) 1-18

Front 84

Unshielded varieties of cat. 6A and higher balanced twisted-pair cabling should not _______.

Back 84

Not be installed in cable bundles composted of cat. 6A and higher balanced twisted-pair cabling mixed with lower performing cabling within the same bundle with in a pathway. 1-20

Front 85

______ is a ratio of the speed of transmission aling a cable relative to the speed of light in a vacuum.

Back 85

Nominal velocity of propagation (NVP) 1-21

Front 86

____ is the time interval required for a signal to be transmitted from one end of a circuit to the other. It is expressed in nanoseconds.

Back 86

Propagation Delay 1-21

Front 87

____ is the difference in the propagation delay between the slowest and fastest pairs within the same cable sheath. This is measured in nanoseconds.

Back 87

Delay Skew 1-21

Front 88

The length of twisted-pair cable usally varies from approximately _______.

Back 88

6 mm (0.25) to 150 mm (6 in) 1-22

Front 89

Proper cable design and twisting of the pairs minimize detrimental _______.

Back 89

crosstalk and noise 1-22

Front 90

The shielding is used to:

Back 90

Reduce the level of the signal radiated from the cable

Minimize the effect of external EMI on the cable pairs.

Provide physical protection. 1-23

Front 91

The shield characteristics are as follows:

Back 91

Foil will typically block higher frequencies ( 30 MHz and higher.

Copper braids will block lower frequencies

Solid tubing will block all frequencies from susceptible cables

CBC's may help divert all induced frequencies from susceptible cables 1-23

Front 92

What does CBCs stand for?

Back 92

Coupled bonding conductors 1-23

Front 93

The inner portion of the glass optical fiber used for transporting the light pulse is call the _______.

Back 93

Core 1-27

Front 94

The surrounding glass layer of the Optical Fiber is call the _______. The purpose os the ______ is to confine the light within th core by creating a reflective boundary.

Back 94

Cladding 1-27

Front 95

Optical fibers are classified as either ______ or _____.

Back 95

Singlemode or Multimode 1-27

Front 96

Singlemode optical fibers have a relatively small diameter, featuring a core of _________ and a cladding diameter equal to ______.

Back 96

8 to 11 micrometers, 125 micrometers 1-27

Front 97

Multimode has a larger core diameter at ______ with a cladding at ______.

Back 97

50 or 62.5 micrometers, 125 micrometers

Front 98

Current standards support both ______ and ______ as well as single mode optical fiber cabling.

Back 98

50/125 and 62.5/125 micrometers 1-27

Front 99

_____ cable has a greater bandwidth.

Back 99

50/125 micrometers 1-27

Front 100

What does LED stand for?

Back 100

Light-emitting diode 1-27

Front 101

What does VCSEL stand for?

Back 101

Verical cavity surface emitting laser 1-27

Front 102

Two characteristics of particular impsrtance in the transport of information over optical firber media are __________.

Back 102

Bandwidth and attenuation 1-27

Front 103

Bandwidth and attenuation relate to the transmission of ___________.

Back 103

Light pulses over optical fiber cables 1-27