Chapter 16 Flashcards
Absorption
The loss of energy in an
electromagnetic signal as it
passes through a medium.
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AGC
Automatic Gain Control
A circuit arrangement used to
automatically sense variations in
the received signal levels and
adjust the gain of the receiver
amplification stages to
provide a constant output.
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Amplitude
The size or magnitude of a
voltage or current waveform.
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Access Point (AP)
Access Point
Stand-alone hardware device or
a computer wireless adapter
with software that acts as a
wireless communication hub for
users of wireless devices to
connect with each other and to
bridge those devices to the
cabled portion of the network.
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BSS
Basic Service Set
A single wireless LAN (WLAN)
access point (AP) and its
associated clients, loosely
equivalent to a wireless
collision domain.
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DAS
Distributed Antenna System
A network of spatially separated
antenna nodes connected to a
common system source via
transport medium that provides
wireless service within a
geographic area or structure.
(HetNet Forum)
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Diffraction
The bending of sound, radio, or
light waves around an object,
barrier, or aperture edge.
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Dispersion
The loss incurred by an RF
signal due to the natural
broadening of the wave front.
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ERRCS
Emergency Responder Radio
overage Systems
An implementation of distributed
antenna system (DAS) designed
for use by first responders or
public safety officials. These
systems re-transmit fire and police
radio sianals from outside of a
the building’s interior
allowing for continuous
communication even within
structures whose construction
greatly attenuates outside
radio signals.
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Extended Service Set
(ESS)
Extended Service Set
A collection of access points (APS) that are tied together by a wired backbone in a single collision domain, or by virtual LANs (VLANs) to allow Layer 2 data link layer) roaming.
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Frequency
A measure of the rate at which a
periodic function repeats. It is
the number of cycles or events
per unit of time. For
electromagnetic signals,
frequency is expressed
in hertz (Hz).
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IBSS
Independent Basic Service Set
A group of stations in a wireless
LAN (WLAN) that communicate
directly with each other (without
the use of a central access point
[AP]). This type of network is
also called an ad hoc network.
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IR (Standard)
Infrared (Standard)
An inexpensive
telecommunications standard
based on the use of the
IR light spectrum.
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LoS
Line of Sight
The imaginary line that connects
the observer’s eye with the
object the observer is looking at.
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NIC
Network Interface Card
The circuitry in a device that
provides the means to connect,
via cabling or wireless to a
network.
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OS
Operating System
The system software that
controls the execution of all
programs and the use of
resources on a device
such as a computer.
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PTP
Point to Point
A direct connection established
between two specific locations,
as between two buildings
or devices.
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Reflection
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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Refraction
The abrupt change in direction
of a wave front at the interface
between two dissimilar media as
the incident wave front enters
the second medium.
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QoS
Quality of Service
1 .A commitment to
performance, based on
predefined service pararneters.
2.A measure of the level of
service provided on a network.
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Scattering
A change in the level, direction, frequency, or polarization of incident radiation when it encounters small particles or inhomogeneous particles whose size is similar to or smaller than the wavelength of the incident radiation.
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Wavelength
The distance between points of
a corresponding phase of one
complete cycle of a wave. In
electromagnetic systems,
wavelength is typically
measured in meters.
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WLAN
Wireless Local Access Network
A LAN that functions wirelessly
between the client and a
wireless access point (WAP).
Most modern WLANs are based
on IEEE 802.11 standards,
marketed under the Wi-Fi name.
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Name 3 technological
considerations in
wireless design.
1 .Scalability of the network
2. Compatibility of the overall network
3. ImpIementation of a wireless network based around standards
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