User's Manual

6881094C31-C October 14, 2003
Glossary-5
low-speed
handshake
150-baud digital data sent to the radio during trunked operation while
receiving audio.
LSH See low-speed handshake.
Master In Slave Out SPI data line from a peripheral to the MCU.
Master Out Slave In SPI data line from the MCU to a peripheral.
MCU See microcontroller unit.
MDC Motorola Digital Communications.
MDI MCU/DSP Interface internal to the Patriot IC.
MHz See Megahertz.
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.
NiCd Nickel-cadmium.
NiMH Nickel-metal-hydride.
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.
Term Definition