Glossary of Terms
H-2 PN: 10580-00305 Rev. J MS20xxC UG
Glossary Terms
Adapter : A fitting that supplies a passage between two sets of equipment when
they cannot be directly interconnected.
Attenuation : Attenuation refers to decreasing in signal magnitude between two
points. These points may be along a radio path, transmission line or
other devices.
Attenuator : Attenuator is a device specifically designed to decrease the magnitude
of a signal transmitted through it.
Band Pass Filter : A Band Pass Filter is a radio wave filter with a specific range of
frequencies in which it is designed to pass. It rejects frequencies outside
the pass-band range. A resistor-inductor-capacitor circuit is an example
of a Band Pass Filter.
BER : Bit Error Rate or Bit Error Ratio (link quality specification/testing)
(BER) BER is a measure of transmission quality. The
ratio of error bits to the total number of bits transmitted. A bit
error rate of 10-6 refers to an average of one error per million bits.
It is generally shown as a negative exponent, (for example, 10-7
which means 1 out of 107 bits are in error or 1 out of 10,000,000 bits are
in error). Bit Error Rate (BER) is the fraction of a
sequence of message bits that are in error.
BERT : Bit Error Rate Test/Tester (BERT) BERT is a test that gauges
the quality of the T1 or digital line. By sending a known pattern
to another device across the span the far end device can compare
incoming pattern to its’ own, thereby indicating bit errors on the line.
Broadband : Broadband refers to telecommunication that provides multiple channels
of data over a single communications medium, typically using some
form of frequency or wave division multiplexing. It is a service or
system requiring transmission channels capable of supporting rates
greater than the Integrated Services Digital Network (ISDN) primary
rate.
Coaxial Cable : Coaxial Cable (Coax) is a type of electrical communications medium
used in the LAN environment. This cable consists of an outer conductor
concentric to an inner conductor, separated from each other by
insulating material, and covered by some protective outer material.
This medium offers large bandwidth, supporting high data rates with
high immunity to electrical interference and a low incidence of errors.
Coax is subject to distance limitations and is relatively expensive and
difficult to install.
DANL : Displayed Average Noise Level (DANL): Displayed average noise level
is sometimes confused with the term Sensitivity. While related, these
terms have different meanings. Sensitivity is a measure of the
minimum signal level that yields a defined signal-to-noise ratio (SNR)
or bit error rate (BER). It is a common metric of radio receiver
performance. Spectrum analyzer specifications are always given in
terms of the DANL. One of the primary uses of a spectrum analyzer is to
search out and measure low-level signals. The limitation in these
measurements is the noise generated within the spectrum analyzer
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