Chapter 16 - Wireless Networks Flashcards
____ and ____ are the basic measurements used in analyzing radio waves and other wave forms.
Frequency and amplitude
Backend equipment is typically located in _____ or where coverage is needed and is deployed to support antennas that serve the intended coverage area.
Telecommunications Room (TR)
What is reflection and its affect on the behavior of waves?
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.
What is refraction and its affect on the behavior of a wave?
Refraction changes direction as the wave enters a second medium.
What is scattering and its affect on the wave form?
Scattering is a change in the level, direction, frequency or polarization when the waveform encounters particles that might smaller than the wavelength of the incident radiation.
What is diffraction and its affect on the waveform?
Diffraction is the bending of sound, radio or light waves around an object.
What is absorption and its affect on the waveform?
The loss of energy as it passes through a medium.
True or False
At very high frequencies, coaxial cabling tends to have very high loss as a result of the skin effect increasing the resistance of the conductors.
True
At frequencies above ___, waveguide feeders are a better choice than coaxial cabling as a transmission line for feeding radio frequency (RF) signals in a wireless system.
A) 2 GHz
B) 3 GHz
C) 4 GHz
D) 6 GHz
A) 2 GHz
What are the three primary means an active DAS uses to transport radio signals?
- Analog modulation of RF signals onto an optical carrier
- Down conversion of RF signals to IF
- Digital sampling of RF signals
The distance between points of a corresponding phase of one complete cycle of a wave is called its:
A) Frequency
B) Period
C) Wavelength
D) Amplitude
C) Wavelength
Amplitude is the size or magnitude of the voltage or current waveform
Period refers to the time
Frequency refers to the rate at which a periodic function repeats
Intermodulation distortion occurs when two or more strong signals pass through a ____ device and multiply by each other.
Nonlinear
If Radio Frequency (RF) amplifier doubles the power of its signal, it has a gain of ____.
3dB
When calculating isotopic (radiating power in all directions) gain for antenna signal transmission, each ___ dB increase, doubles the range.
6dB
Personal area networks (PANs) are used to interconnect devices in a personal operating space, which is typically within a ___ radius.
33ft
