Global Core Accessory Interface Motorola
Solutions proprietary accessory port for use with
Motorola Solutions approved cables. USB and
RS232 styles supported.
Abbreviation:GCAI
Global Navigation Satellite System A
standard generic term for satellites orbiting the
Earth to determine the geographical location. GNSS
uses satellites from the GPS, GLONASS, Galileo,
and BeiDou systems.
Abbreviation:GNSS
Global Positioning System (GPS) System
of 24 satellites that identify earth locations, launched
by the U.S. Department of Defense. By triangulating
signals from three of the satellites, a GPS receiving
unit can pinpoint its current location anywhere on
earth to within a few meters.
Input Output For computers, bidirectional input/
output (I/O) ports couple the microcontroller to
external devices. This interface can operate in
parallel or serial form and is usually digital (0 to
+5 Vdc) logic. Parallel interfaces allow I/O data
transfer of eight bits at a time to parallel ports on
the microcontroller. The technology is typically used
to transfer data between the microcontroller and the
external logic it controls. Screen reader support is
enabled.
Abbreviation:I/O
Integrated Circuit (IC) An assembly
of interconnected components on a small
semiconductor chip, usually made of silicon.
One chip can contain millions of microscopic
components and perform many functions.
integrated Terminal Management
integrated Terminal Management in Motorola
Solutions Dimetra radio systems.
Abbreviation:iTM
Intermediate Frequency A range of frequent
audio and radio frequencies.
Abbreviation:IF
Joint Test Action Group Same as IEEE std
1149.1a, which defines signals and behavior for
serial testing.
Abbreviation:
JTAG
kilohertz (kHz) One thousand cycles per
second. Used especially as a radio-frequency unit.
LDMOS Laterally Diffused Metal Oxide
Semiconductor
Light Emitting Diode (LED) An electronic
device that lights up when electricity is passed
through it.
Local Oscillator A tunable oscillator used in a
radio or TV receiver to select a particular channel
for reception.
Abbreviation:LO
Low Noise Amplifier (LNA) The main
amplifying unit in the receiver.
Low-Pass Filter A filter that passes only
frequency components lower than a certain
frequency.
Abbreviation:LPF
Man Machine Interface (MMI) An interface
that enables information to be passed between a
human user and hardware or software components
of a computer system.
Megahertz (MHz) One million cycles per
second. Used especially as a radio-frequency unit.
Phase-locked Loop (PLL) A circuit in which
an oscillator is kept in phase with a reference,
usually after passing through a frequency divider.
Printed Circuit Board (PC Board) A circuit
manufactured so that many or all of the components
are attached to a nonconductive circuit board with
copper strips on one or both sides to replace wires.
Programming Cable A cable that allows the
computer to communicate directly with certain
radios using USB.
Radio Frequency (RF) The portion of the
electromagnetic spectrum between audio sound and
infrared light (approximately 10 kHz to 10 GHz).
Global Core Accessory Interface
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