Motorola APX 7000 Basic Service Manual page 287

Glossary
Term
Serial
Communication
Interface Input Line
SCI IN
Serial Peripheral
Interface
signal
Signal Qualifier
mode
softpot
software
software
potentiometer
spectrum
SPI
squelch
SRAM
SRIB
SSI
Standby mode
static RAM
status calls
Synchronous Serial
Interface
system central
controllers
system select
A full-duplex (receiver/transmitter) asynchronous serial interface.
See Serial Communication Interface Input Line.
How the microcontroller communicates to modules and ICs through the
CLOCK and DATA lines.
An electrically transmitted electromagnetic wave.
An operating mode in which the radio is muted, but still continues to
analyze receive data to determine RX signal type.
See software potentiometer.
Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
A computer-adjustable electronic attenuator.
Frequency range within which radiation has specific characteristics.
See Serial Peripheral Interface.
Muting of audio circuits when received signal levels fall below a pre-
determined value. With carrier squelch, all channel activity that exceeds
the radio's preset squelch level can be heard.
See static RAM.
Smart Radio Interface Box. See RIB.
See Synchronous Serial Interface.
An operating mode in which the radio is muted but still continues to
monitor data.
A type of memory used for volatile, program/data memory that does not
need to be refreshed.
Pre-defined text messages that allow the user to send a conditional
message without talking.
DSP interface to peripherals that consists of a clock signal line, a frame
synchronization signal line, and a data line.
Main control unit of the trunked dispatch system; handles ISW and
OSW messages to and from subscriber units (See ISW and OSW).
The act of selecting the desired operating system with the system-select
switch (also, the name given to this switch).
Definition
Section 3: Glossary-9