Motorola ASTRO DIGITAL XTS 3000 series Basic Service Manual page 8

MISO
MOSI
OMPAC
Open
Architecture
OSW
PC Board
PL
PLL
PTT
Registers
Repeater
RESET
RF PA
RSS
RPT/TA
RX DATA
Signal Qualifier
Mode
SCI IN
SLIC
Softpot
Software
SPI
vi
Master In Slave Out; used by the slave device to send data to the master device.
Master Out Slave In; used by the master device to send data to the slave device.
Over-Molded Pad-Array Carrier; a Motorola custom IC package, distinguished
by the presence of solder balls on the bottom pads.
A controller configuration that utilizes a microprocessor with extended ROM,
RAM, and EEPROM.
Outbound Signalling Word; data transmitted on the control channel from the
central controller to the subscriber unit.
Printed Circuit board
Private-Line ® tone squelch; a continuous sub-audible tone that is transmitted
along with the carrier.
Phase-Locked Loop; a circuit in which an oscillator is kept in phase with a
reference, usually after passing through a frequency divider.
Push-To-Talk; the switch located on the left side of the radio which, when
pressed, causes the radio to transmit.
Short-term data-storage circuits within the microcontrol unit or
programmable logic IC.
Remote transmit/receive facility that re-transmits received signals in order to
improve communications coverage.
Reset line; an input to the microcontroller that restarts execution.
Radio Frequency Power Amplifier
Radio Service Software
RePeaTer/Talk-Around
Recovered digital data line.
An operating mode whereby the radio is muted but still continues to analyze
receive data to determine RX signal type.
Serial Communication Interface INput line
Support-Logic IC; a custom gate array used to provide I/O and memory
expansion for the microcontroller.
Software potentiometer; a computer-adjustable electronic attenuator.
Computer programs, procedures, rules, documentation, and data pertaining
to the operation of a system.
Serial Peripheral Interface; how the microcontroller communicates to
modules and ICs through the CLOCK and DATA lines.