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35 Cards in this Set
- Front
- Back
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Technological considerations in the design of a wireless network include the following three items:
(16-2) |
1. Scalability of the network;
2. Compatibility of the overall network;
3. implementation of a wireless network based around standards |
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What defines the reliability of a wireless network?
(16-3) |
1. System Accessibility;
2. Continuity;
3. Consistency of service |
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What can affect wireless communications?
(16-4) |
Materials, Objects, local geography, and even atmosphere |
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What should effectively provide some balance between the end user expectations and the wireless network performance?
(16-5) |
The QoS program |
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Radio waves, sound waves, and fluid waves share the same characteristics. They can be measured by these three characteristics:
(16-6) |
Amplitude;
Frequency;
Wavelength |
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What are typical barriers and obstructions to EM waves?
(16-9) |
Buildings and other man-made ojects; as well as natural obstructions (e.g. trees, hills, bodies of water, mountains) |
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What is reflection?
(16-9)
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The abrupt change in direction of a wave front at the interface between two dissimilar media such that the incident wave front returns into the medium from which it originated. |
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What is refraction?
(16-9) |
The abrupt change in direction of a wave front at the interface between two dissimilar media such that the incident wave front enters the second medium. |
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What is scattering?
(16-9) |
A change in the level, direction, frequency, or polarization of incident radiation when it encounters small particles or inhomogeneous particles. |
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What is diffraction?
(16-9) |
The bending of sound, radio, or light waves around an object, barrier, or aperture edge. |
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What is absorption?
(16-9) |
The loss of energy in an EM signal as it passes through a medium. |
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What are the frequencies for:
VF, Voice Frequency? VLF, Very Low Frequency? LF, Low Frequency? MF, Medium Frequency? HF, High Frequency? VHF, Very High Frequency? UHF, Ultra High Frequency?
(16-10) |
300 Hz to 3000 Hz; 3 kHz to 30 kHz; 30 kHz to 300 kHz; 300 kHz to 3 MHz; 3 MHz to 30 MHz; 30 MHz to 300 MHz; 300 MHz to 3000 MHz
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What is modulation?
(16-12) |
It is the process of altering the amplitude, frequency, or phase of a carrier signal in a measured way, which allows for data to be added to it |
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Complimentary code keying (CCK) is a standard adopted by the IEEE 802.11 standards committee as the basis for the high rate physical layer extension to deliver data rates of 11 megabits per second at what frequency?
(16-16) |
2.4 GHz |
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In Quadrature phase shift keying (QPSK), the four angles are out of phase by how many degrees?
(16-16) |
90 degrees |
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What are the typical WLAN signal modulation techniques used today?
(16-16) |
Quadrature Amplitude Modulation (QAM) and Orthogonal Frequency Division Multiplexing (OFDM) |
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Heavy moisture in the atmosphere causes disruptions in the transmission of RF signals at what frequencies?
(16-22) |
Above 6 GHz |
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What frequencies are primarily used for public safety applications?
(16-23) |
6 GHz and 11 GHz |
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True or False; Unlicensed wireless network equipment have more power output than licensed equipment.
(16-23) |
False; Unlicensed wireless network equipment have less power output |
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What are the most popular frequencies for PTP and Point to multipoint data networks on the unlicensed spectrum?
(16-23) |
2.4 GHz and 5 GHz |
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What factors affect the selection of antennas?
(16-25) |
Required gain; allowable wind load; frequency; aesthetics; and zoning |
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What is used on parabolic antennas to keep the ice and snow from accumulating on antennas and causing additional weight and wind load?
(16-25) |
Radome Covers |
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What is the path loss value when using radome coners?
(16-25) |
0.5 dB isotropic |
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Why does coaxial cabling have very high losses at very high frequencies?
(16-29) |
As a result of the skin effect increasing the resistance of the conductors |
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Proper connectors should match the following four characteristics:
(16-29) |
1. Frequency;
2. Power;
3. Environment;
4. RF Media |
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The FAA and FCC must be notified when either of the following two supporting structures are involved:
(16-30) |
1. A structure within 5 miles of an airport or heliport;
2. If the antenna supporting structure is more than 200 feet high |
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What is used to power electronic equipment located away from convenient sources of power?
(16-32) |
Voltage injectors |
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What are the two types of voltage injectors in use?
(16-32) |
1. Coaxial type;
2. PoE |
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What does a DAS do?
(16-34) |
Transmits and receives or relays RF signals within buildings, structures, tunnels, or other areas where wireless services cannot because of lack of signal protection from outdoor networks or where no suitable outdoor network exists. |
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What are the four types of common DAS cabling distribution?
(16-37) |
1. Single mode Fiber;
2. Multimode Fiber;
3. Balanced twisted pair;
4. Coaxial cabling |
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What is the result if the antenna is not tuned to the same frequency band to which the radio is connected?
(16-38) |
the reception and transmission shall be impaired |
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What are traditional antenna types?
(16-38) |
Omnidirectional; directional; radiating cable; combination of all three |
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A single length of coaxial cable used to radiate (transmit) and receive signals is called a _________
(16-38) |
Radiating Coaxial Cable Technology |
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Where is radiating cable antennas useful?
(16-39) |
1. Where signal power is regulated (hospitals);
2. where radio broadcast propagation is poor (prisons) |
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Two common topologies that serve DAS within a building structure are called:
(16-52) |
Star topology;
tapped trunk topology |
