Glossary
Glossary-5
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.
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.
over-the-air rekeying
Allows the dispatcher to remotely reprogram the encryption keys in the
radio.
PA
Power amplifier.
paging
One-way communication that alerts the receiver to retrieve a message.
PC Board
Printed Circuit Board. Also referred to as a PCB.
PCIC
See Power Control IC.
Term
Definition
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......