Glossary-2
DSP Digital Signal Processor, microprocessor specifically designed to perform
digital signal processing algorithms.
DVP Digital Voice Protection, or Digital Voice Privacy, applies to the Vulcan
encryption algorithm and the Motorola product in which it is sold.
EIA Electronic Industries Association
E/M Telephone circuit signalling lines (Ear/Mouth, Ernie/Mary)
EOM End-Of-Message, 6 kHz signal transmitted at the end of a 12 kbps CVSD signal
that is used by the receiving unit for fast muting of the speaker audio for
squelch tail elimination.
ESD Electro Static Discharge
ETS European Telecommunications Standards
EU European Union
Failsoft Trunked station mode entered when central controller fails
FCC Federal Communications Commission.
FFSK Fast FSK
FM Frequency Modulation
Frequency Number of times a complete electromagnetic-wave cycle occurs in a fixed unit
of time (usually one second).
FRU Field Replaceable Unit
FSK Frequency Shift Keying
GPI General Purpose Input
GPO General Purpose Output
HLGT High Level Guard Tone
IC Integrated Circuit, An assembly of interconnected components on a small
semiconductor chip, usually made of silicon. One chip can contain millions o
microscopic components and perform many functions.
IF intermediate frequency
I/O Input or Output
IRB Inbound Recovery Board used with the Trunking Controller
IRQ Interrupt Request.
kHz kilohertz: One thousand cycles per second. Used especially as a
radio-frequency unit.
LCD Liquid-Crystal Display: An LCD uses two sheets of polarizing material with a
liquid-crystal solution between them. An electric current passed through the
liquid causes the crystals to align so that light cannot pass through them.
Term Definition
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