User Manual Part 2

Lynx.GX Installation and Maintenance BETA VERSION
Acronyms / Glossary
10 Base-T/F
This designation is an Institute of Electrical and Electronics
Engineers (IEEE) shorthand identifier. The "10" in the media
type designation refers to the transmission speed of 10 Mbps.
The "Base" refers to baseband signaling, which means that only
Ethernet signals are carried on the medium. The "T" represents
twisted-pair; the "F" represents fiber optic cable.
bandwidth
The width of a band of electromagnetic frequencies. Used to
mean (1) how fast data flows on a given transmission path, and
(2), somewhat more technically, the width of the range of
frequencies that an electronic signal occupies on a given
transmission medium. Any digital or analog signal has a
bandwidth.
100 Base-TX/FX
The "100" in the media type designation refers to the
transmission speed of 100 Mbps. The "Base" refers to baseband
signaling, which means that only Ethernet signals are carried on
the medium. The "TX" represents two pairs of data grade
twisted-pair wire; the “FX” represents a two-strand optical fiber
cable.
baseband
Any frequency band on which information is superimposed,
whether or not the band is multiplexed and information is sent on
sub-bands. The frequency band is not shifted to some other
frequency band but remains at its original place in the
electromagnetic spectrum.
baud
Baud was the prevalent measure for data transmission speed
until replaced by a more accurate term, bps (bits per second).
AC
Alternating Current
Alternating current
In electricity, alternating current (AC) occurs when charge
carriers in a conductor or semiconductor periodically reverse
their direction of movement.
beamwidth, half power
In a plane containing the direction of the maximum lobe of the
antenna pattern, the angle between the two directions in which
the radiated power is one-half the maximum value of the lobe.
BER
Bit Error Rate. The bit error rate (BER) is the percentage of bits
that have errors relative to the total number of bits received in a
transmission, usually expressed as ten to a negative power.
amp
Ampere. An ampere is a unit of measure of the rate of electron
flow or current in an electrical conductor. One ampere of current
represents one coulomb of electrical charge (6.24 x 10
18
charge
carriers) moving past a specific point in one second.
BNC connector
Developed in the late 1940’s as a miniature version of the Type
C connector, BNC stands for Bayonet Neill Concelman and is
named after Amphenol engineer Carl Concelman. The BNC
product line is a miniature quick connect/disconnect RF
connector.
amplifier
An electronic device that increases the voltage, current, or power
of a signal.
analog
An analog signal is one in which a base carrier’s alternating
current frequency is modified in some way, such as by amplifying
the strength of the signal or varying the frequency, in order to
add information to the signal.
broadband
In general, broadband refers to telecommunication in which a
wide band of frequencies is available to transmit information.
Because a wide band of frequencies is available, information can
be multiplexed and sent on many different frequencies or
channels within the band concurrently, allowing more information
to be transmitted in a given amount of time (much as more lanes
on a highway allow more cars to travel on it at the same time).
antenna
A device used for radiating or receiving electromagnetic energy.
attenuate
To lessen the strength of.
CLI
Command Line Interface.
AUX
Auxiliary
coax
Coaxial cable. A cable comprised of a center conductor,
surrounded by an insulating core, with a braided or solid shield.
Conductive shield surrounds the core with outside insulation.
azimuth
Azimuth and elevation are angles used to define the apparent
position of an object in the sky, relative to a specific observation
point. The observer is usually (but not necessarily) located on
the earth's surface. The azimuth (az) angle is the compass
bearing, relative to true (geographic) north, of a point on the
horizon directly beneath an observed object. As seen from above
the observer, compass bearings are measured clockwise in
degrees from north. Azimuth angles can thus range from 0
degrees (north) through 90 (east), 180 (south), 270 (west), and
up to 360 (north again).
The elevation (el) angle, also called the altitude, of an observed
object is determined by first finding the compass bearing on the
horizon relative to true north, and then measuring the angle
between that point and the object, from the reference frame of
the observer.
codec
The term codec is also an acronym that stands for
"compression/decompression." A codec is an algorithm or
specialized computer program that reduces the number of bytes
consumed by large files and programs.
dB
Decibel. In electronics and communications, the decibel
(abbreviated as dB, and also as db and DB) is a logarithmic
expression of the ratio between two signal power, voltage, or
current levels.
dBi
Used to define the gain of an antenna system relative to an
isotropic radiator at radio frequencies. The symbol is an
abbreviation for "decibels relative to isotropic."
Elevation angles for objects above the horizon range from 0 (on
the horizon) up to 90 degrees (at the zenith).
back-to-back testing
A simple way to verify that the radios are fully operational before
they are installed.
Acronyms / Glossary 103