Deck 3: Conducted and Wireless Media

Question 1

Businesses can use terrestrial microwave to implement telecommunications systems between corporate buildings.

Answer 1

True

Question 2

One way of categorizing satellite systems is by how far the satellite is from the Earth.

Answer 2

True

Question 3

The braided metal shield is very good at blocking electromagnetic signals from entering the cable and producing noise.

Answer 3

True

Question 4

Much of the Category 3 wire sold today is used for new computer network installations.

Question 5

Electromagnetic interference can be reduced with proper shielding, but it cannot be completely avoided unless you use fiber-optic cable.

Question 6

Category 1 through 7 twisted pair wires can be purchased only as unshielded twisted pair.

Question 7

Category 1 twisted pair wire produces less noise and signal attenuation than Category 2.

Question 8

Category 1 twisted pair wire is not recommended for transmitting megabits of computer data.

Question 9

A fairly common application for baseband coaxial used to be the interconnection of hubs within a local area network.

Question 10

It is estimated that in the future, photonic fibers will have transmission speeds and distances at least 10 times that of current fiber-optic cable.

Question 11

Category 1 wire is susceptible to experiencing noise and signal attenuation.

Question 12

Single-mode fiber-optic cable is labeled 62.5/125 cable.

Question 13

Wireless transmissions generally do not have to deal with right-of-way issues.

Question 14

Thick coaxial cable has limited noise isolation and typically carries baseband signals.

Question 15

The advantage to being closer to Earth is that the satellite must continuously circle the Earth to remain in orbit.

Question 16

Fiber-optic cable cannot generate nor be disrupted by electromagnetic interference.

Question 17

Light traveling through air experiences little resistance.

Question 18

Category 5 twisted pair has a higher number of twists per inch than the Category 1 to 4 wires.

Question 19

Microwave transmissions follow the curvature of the Earth.

Question 20

Thin coaxial cable typically carries broadband signals.

Question 21

____ twisted pair was designed to transmit 10 Mbps of data over a local area network for distances up to 100 meters (328 feet).

A)Category 2
B)Category 3
C)Category 5
D)Category 6

Question 22

Satellites that are always over the same point on Earth can be used for long periods of high-speed data transfers.

Question 23

Category 5e twisted pair can run farther than 100 meters from its source to its final destination, as long as the signal is regenerated at least every ____ meters.

A)20
B)50
C)75
D)100

Question 24

Four basic generations of cellular telephone systems currently exist.

Question 25

A current or signal in one wire can produce an unwanted current or signal, called ____, in a second wire.

A)current-talk
B)signal-talk
C)crosstalk
D)crossover

Question 26

ZigBee is capable of transmitting signals for up to one mile.

Question 27

Because each cell uses low-power transmissions, it is not likely that a transmission within one particular cell will interfere with a transmission in another cell.

Question 28

Geosynchronous-Earth-orbit satellites are most commonly used for signal relays for broadcast, cable, and direct television.

Question 29

____ is the designation for a digital telephone circuit that transmits voice or data at 1.544 Mbps.

A)ISDN
B)T-1
C)VSAT
D)T-32

Question 30

Data transmission speed is the number of bits per second that can be transmitted.

Question 31

____ twisted pair is the least quality twisted pair wire that should be used in a data/voice application.

A)Category 1
B)Category 3
C)Category 5
D)Category 7

Question 32

At the end of the twentieth century, there were approximately 3000 LEO satellites.

Question 33

____ twisted pair wire is used in environments that have a noticeable amount of electromagnetic interference.

A)Shielded
B)Congealed
C)Super
D)Dilithium

Question 34

ZigBee is a form of wireless technology used within buildings.

Question 35

____ twisted pair was designed to transmit 20 Mbps of data for distances up to 100 meters.

A)Category 1
B)Category 3
C)Category 4
D)Category 5

Question 36

IEEE 802.16a is a revision of the 802.16 standard that provides a high-speed connection for slowly moving devices.

Question 37

____ twisted pair is designed to support data transmission with signals as high as 200 MHz for 100 meters.

A)Category 6
B)Category 7
C)Category 7a
D)Category 7e

Question 38

AMPS and D-AMPS technologies generally offer a clearer signal than all PCS technologies.

Question 39

In a(n) ____ none of the wires is wrapped with a metal foil or braid.

A)shielded twisted pair (STP)
B)unshielded twisted pair (UTP)
C)CAT 4 twisted pair
D)CAT 7 twisted pair

Question 40

At the end of the twentieth century, approximately 105 MEO satellites were orbiting the Earth.

Question 41

____ cable ranges in size from approximately 6 to 10 mm or more (1/4 to 3/8 inch) in diameter.

A)Thin coaxial
B)Thick coaxial
C)CAT 2
D)CAT 3

Question 42

The ____ cable is similar to fiber-optic cable in that it is as thin as a hair and transparent. The big difference, however, is that this new cable is full of holes.

A)photonic fiber
B)single-stranded coaxial
C)thick coaxial
D)thin coaxial

Question 43

____ transmission systems are similar to terrestrial microwave systems except that the signal travels from a ground station on Earth to a satellite and back to another ground station on Earth.

A)Satellite microwave
B)Cellular
C)Downlink
D)Terrestrial microwave

Question 44

____ transmission requires the use of a very thin fiber-optic cable and a very focused light source, such as a laser.

A)Multimode
B)Reflection
C)Single-mode
D)Refraction

Question 45

____ technology uses digital signaling in which the cable carries only one channel of digital data.

A)Broadband coaxial
B)CAT 7
C)Baseband coaxial
D)Fiber optic

Question 46

As the length of a glass cable grows, the light signal attenuates due to reflection and ____.

A)EMI
B)RFI
C)refraction
D)friction

Question 47

____ cable is a thin glass cable, a little thicker than a human hair, surrounded by a plastic coating.

A)Single-stranded coaxial
B)Fiber-optic
C)Braided coaxial
D)CAT 7

Question 48

The typical maximum distance between microwave towers is roughly ____ to 30 miles.

A)3
B)6
C)8
D)15

Question 49

____ technology typically transmits analog signals and is capable of supporting multiple channels of data simultaneously.

A)Broadband coaxial
B)CAT 7
C)Baseband coaxial
D)Fiber optic

Question 50

____ transmission uses a slightly thicker fiber cable and an unfocused light source, such as an LED.

A)Multimode
B)Reflection
C)Single-mode
D)Refraction

Question 51

____ transmission means that to receive and transmit a signal, each antenna must be in sight of the next antenna.

A)Uplink
B)Omnidirectional
C)Line-of-sight
D)Downlink

Question 52

Because of its good shielding properties, ____ is good at carrying analog signals with a wide range of frequencies.

A)CAT 1 wire
B)CAT 2 wire
C)copper wire
D)coaxial cable

Question 53

When a light signal inside the cable bounces off the cable wall and back into the cable, this is called ____.

A)refraction
B)reflection
C)blinking
D)friction

Question 54

____ is a form in which a shield is wrapped around each wire individually, around all the wires together, or both.

A)Shielded twisted pair (STP)
B)Unshielded twisted pair (UTP)
C)CAT 2 twisted pair
D)CAT 5 twisted pair

Question 55

____ cable is virtually impossible to wiretap.

A)CAT 1
B)Single-stranded coaxial
C)Thick coaxial
D)Fiber-optic

Question 56

____ cable is approximately 4 mm (less than 1/4 inch) in diameter.

A)CAT 2
B)Thick coaxial
C)Thin coaxial
D)CAT 3

Question 57

____ transmission systems transmit tightly focused beams of radio signals from one ground-based microwave transmission antenna to another.

A)Satellite
B)Cellular
C)Downlink
D)Terrestrial microwave

Question 58

The closer a satellite is to the Earth, the shorter the times required to send data to the satellite, that is, to ____.

A)downlink
B)uplink
C)download
D)send down

Question 59

____ cable contains, as the name implies, a single copper wire in the center of the cable.

A)Braided coaxial
B)Fiber optic
C)thin-stranded coaxial
D)Single-stranded coaxial

Question 60

The transmission time from when a signal first leaves a satellite and then arrives at a ground station is called ____.

A)propagation delay
B)downlink
C)uplink
D)upload

Question 61

____________________ twisted pair is designed to carry analog voice or digital data at low speeds (less than or equal to 9600 bps) and is now obsolete.

Question 62

The third PCS technology was ____ and used a different form of time division multiple access technology.

A)Global System for Mobile (GSM) Communications
B)Time Division Multiple Access (TDMA)
C)Code Division Multiple Access (CDMA)
D)Digital-Advanced Mobile Phone Service (D-AMPS)

Question 63

____ systems are good at sending low-speed signals over short to medium distances.

A)Microwave
B)Satellite
C)WiFi
D)ZigBee

Question 64

Cells, in a cellular telephone system, can range in size from one-half mile in radius to ____ miles in radius.

A)25
B)35
C)50
D)70

Question 65

The first PCS technology used a form of time division multiplexing called ____.

A)Code Division Multiple Access (CDMA)
B)Time Division Multiple Access (TDMA)
C)Global System for Mobile (GSM) Communications
D)Digital-Advanced Mobile Phone Service (D-AMPS)

Question 66

____ satellites are closest to the Earth.

A)Low-Earth-orbit (LEO)
B)Middle-Earth-orbit (MEO)
C)Geosynchronous-Earth-orbit (GEO)
D)Highly-elliptical-Earth-orbit (HEO)

Question 67

____________________ twisted pair was designed to transmit 100 Mbps of data for distances up to 100 meters.

Question 68

A(n) ____________________ is a device that generates a new signal by creating an exact replica of the original signal.

Question 69

____ was the first-generation cellular telephone system.

A)Personal Communications Services (PCS)
B)Time Division Multiple Access (TDMA)
C)Advanced Mobile Phone Service (AMPS)
D)Global System for Mobile (GSM) Communications

Question 70

The ____ system is an example of a single-user Earth station satellite system with its own ground station and a small antenna (two to six feet across).

A)T1
B)LEO
C)VSAT
D)SAT-V

Question 71

Which type of satellite remains located over the same point of earth at all times?

A)LEO
B)MEO
C)GEO
D)HEO

Question 72

A satellite system that has unique properties is the ____ satellite, which is used by governments for spying and by scientific agencies for observing celestial bodies.

A)Low-Earth-orbit (LEO)
B)Middle-Earth-orbit (MEO)
C)Geosynchronous-Earth-orbit (GEO)
D)Highly-elliptical-Earth-orbit (HEO)

Question 73

____________________ wire is designed to support 600 MHz of bandwidth for 100 meters.

Question 74

The popular GPS devices that people use to find directions while driving use which type of satellite system?

A)LEO
B)MEO
C)GEO
D)HEO

Question 75

____________________ is the most common form of twisted pair.

Question 76

____ is a broadband wireless transmission technology that is based upon a series of IEEE standards.

A)WiFi
B)Bluetooth
C)IrDA
D)WiMAX

Question 77

____ systems transmit data over a wide range of frequencies rather than limiting transmissions to a narrow, fixed band of frequencies.

A)WiFi
B)Bluetooth
C)Ultra-wideband
D)Free space optics

Question 78

____________________ cable, in its simplest form, is a single wire (usually copper) wrapped in a foam insulation, surrounded by a braided metal shield, then covered in a plastic jacket.

Question 79

____________________ wire comes as two or more pairs of single-conductor copper wires that have been twisted around each other.

Question 80

____ satellites can be found roughly 1000 to 3000 miles from the Earth.

A)Low-Earth-orbit (LEO)
B)Middle-Earth-orbit (MEO)
C)Geosynchronous-Earth-orbit (GEO)
D)Highly-elliptical-Earth-orbit (HEO)