Topic 18, Wireless Flashcards
(23 cards)
Which active DAS component is responsible for coupling input signals from donor systems?
A. Coupling antenna
B. Bidirectional amplifier
C. Transceiver
D. Receiver
B. Bidirectional amplifier
When trying to control radio signals from leaking outside of a building, a ______________ antenna should be used.
A. Dipole
B. Dome
C. Panel
D. Vee
C. Panel
Omnidirectional antennas broadcast equally in all directions of only ________ cross section(s) of their toroidal (doughnut-shaped) three-dimensional radiation pattern.
A. One
B. Two
C. Three
D. Four
A. One
Which wireless device should be used to support 3 computers and a printer?
A. Bridge
B. Gateway
C. Router
D. Switch
C. Router
When considering the DAS, which component acts as a bidirectional antenna?
A. Multimode optical fiber cable
B. Radiating coaxial cable
C. Shielded twisted pair (STP) cable
D. Single mode optical fiber cable
E. Screened twisted pair (ScTP) cable
B. Radiating coaxial cable
Which of the following is NOT a primary method of transporting radio signals in an active
DAS?
A. Analog modulation of the RF signal
B. Down conversion of the RF signal
C. Up conversion of the RF signal
D. Digital sampling of the RF signal
C. Up conversion of the RF signal
You are designing a DAS system that has a requirement to supply both RF signal and power to the remote transceivers in the system. Which cable will provide the needed services for this application?
A. Multimode optical fiber cable
B. Radiation coaxial cable
C. Shielded twisted-pair cable
D. Single mode optical fiber cable
E. Screened twisted pair (ScTP) cable
C. Shielded twisted-pair cable
You have been asked to design a public safety microwave radio system for the city of
Fairbanks, Alaska. The requirement for reliability, maximum throughput, and minimum interference by fog, rain, or heavy snow is critical. Which frequency will best suit the system’s needs?
A. 2.4 GHz
B. 4.9 GHz
C. 6.0 GHz
D. 11.0 GHz
E. 19.0 GHz
C. 6.0 GHz
You are designing a DAS that will support five buildings on a college campus. Which medium is best suited to ensure the best connectivity and throughput between the headend and backend devices located in the various buildings?
A. Coaxial
B. Optical fiber cabling
C. Shielded twisted pair cabling
D. Unshielded twisted pair cabling
B. Optical fiber cabling
What device is used in both wired and wireless networks to link network access devices?
A. Bridge
B. Gateway
C. Router
D. Switch
A. Bridge
You are designing multi band UHF police radio and VHF fire radio systems for a municipal office. Because of the closeness of the transmit and receive frequencies, you must ensure there is adequate filtering and gain control of the systems. Which device will best meet the ability to separate and control the transmit and receive signals?
A. Bidirectional amplifier
B. Transceiver
C. Repeater
D. Unidirectional amplifier
C. Repeater
In order to maximize its ability to send and receive, an antenna should be ________ to the desired frequency.
A. Dipped
B. Loaded
C. Tuned
D. Peaked
C. Tuned
Which device uses circulators or diplexer filters to separate and combine the different transmit and receive RF paths?
A. Transceiver
B. Bidirectional amplifier
C. Unidirectional amplifier
D. Repeater
C. Unidirectional amplifier
Which of the following is NOT a primary type of DAS antenna?
A. Directional
B. Omnidirectional
C. Polarized
D. Radiation cable
C. Polarized
Which device supplies the radio signal into a DAS (distributive antenna system)?
A. Amplifier
B. Receiver
C. Transmitter
D. Transceiver
D. Transceiver
You are designing a 4.9 GHz microwave system that is using rectangular waveguide from the transceiver to the inside wall of the shelter and an antenna using elliptical waveguide from the antenna to the outside wall of the shelter. The antenna has been designed to be placed 200 ft up on a 250 ft tower. What device will you specify that will best interconnect the two different waveguides?
A. Elliptical wave guide pass through
B. Elliptical wave guide clamp
C. Elliptical waveguide connector
D. Elliptical waveguide flange
C. Elliptical waveguide connector
You are working with the Sheriff’s Department to develop a public safety wireless network that will be secured from interference and have the capability of delivering up 10 Mbps subscriber speed. What microwave frequency should be used to best meet these needs?
A. 2.4 Ghz
B. 4.9 Ghz
C. 5.0 Ghz
D. 5.3 Ghz
B. 4.9 GHz
You are designing a 4.9 GHz microwave system that is using rectangular waveguide from the transceiver to the inside wall of the shelter and an antenna that is to be placed 200 ft up on a 250 ft tower. What type of medium will be best suited to connect the antenna to the transceiver?
A. Circular wave guide
B. Elliptical wave guide
C. Hard line coaxial
D. Rectangular wave guide
B. Elliptical wave guide
What is at the “root” of a DAS (distributive antenna system)?
A. Antenna
B. Receiver
C. Transmitter
D. Transceiver
D. Transceiver
The MINIMUM number of antennas needed to create a DAS is:
A. One
B. Three
C. Five
D. Seven
A. One
As a wireless designer, you have been tasked with designing a DAS which supports UHF public safety radios. You have determined that if you increase the power of the base station antenna, you can solve coverage problems in the basement. One of the restrictive items that you should consider is:
A. A single antenna may not provide the total power multiple antennas may provide
B. The proper launch amplifier has to be chosen to provide the proper power
C. The building’s wall types may still affect the coverage
D. The legal limits of the transmitter
D. The legal limits of the transmitter
The propagation and path loss of radio signals in the target environment can be sampled using:
A. Propagation software
B. Radio power meters
C. Directional antenna
D. Mesh antennas
B. Radio power meters
A tapped trunk topology uses ________ cabling to support a DAS.
A. Shielded twisted pair -
B. Balanced twisted pair -
C. Unbalanced twisted pair -
D. Optical fiber -
D. Optical fiber
