Glossary Glossary-5
Megahertz One million cycles per second. Used especially as a radio-frequency
unit.
microcontroller unit Also written as µC. A microprocessor that contains RAM and ROM
components, as well as communications and programming components
and peripherals.
MISO See Master In Slave Out.
MOSI See Master Out Slave In.
multiplexer An electronic device that combines several signals for transmission on
some shared medium (e.g., a telephone wire).
MUX See multiplexer.
night operation A display mode intended for un-aided eye-sight in dark environments.
This is accomplished by a reduced brightness level of the keypad, front
and top displays. Also, an inverted color scheme utilizing red text, red
numbers, and red icons on a black background at two low levels of
backlighting.
night vision A display mode intended for equipment aided eye-sight in dark
environments, typically using some form of Night Vision Gear. This is
accomplished by a significantly reduced brightness level of the keypad,
front and top displays. Also, an inverted color scheme utilizing red text,
red numbers, and red icons on a black background at three ultra-low
levels of backlighting.
NiMH Nickel-metal-hydride.
nv See night vision.
OMPAC See over-molded pad-array carrier.
open architecture A controller configuration that utilizes a microprocessor with extended
ROM, RAM, and EEPROM.
oscillator An electronic device that produces alternating electric current and
commonly employs tuned circuits and amplifying components.
OSW See outbound signaling word.
OTAR See over-the-air rekeying.
outbound signaling
word
Data transmitted on the control channel from the central controller to the
subscriber unit.
over-molded pad-
array carrier
A Motorola custom IC package, distinguished by the presence of solder
balls on the bottom pads.
over-the-air rekeying Allows the dispatcher to remotely reprogram the encryption keys in the
radio.
Term Definition
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