Frequency Number of times a complete
electromagnetic-wave cycle occurs in a fixed unit
of time (usually one second).
General-Purpose Input/Output (GPIO)
Pins whose function is programmable.
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, bi-directional
input/output (I/O) ports couple the micro-
controller to external devices. This interface can
operate in parallel or serial form and is usually
digital (0 to +5Vdc) logic. Parallel interfaces allow
I/O data transfer of eight bits at a time to parallel
ports on the micro-controller. The technology
is typically used to transfer data between the
micro-controller and the external logic it controls.
Screen reader support 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 non-conductive
MN002465A01-AN
General-Purpose Input/Output
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