Motorola APX 7000 Detailed Service Manual page 636

Glossary-8
Term
software
software
potentiometer
spectrum
SPI
squelch
SRAM
SSI
Standby mode
static RAM
Synchronous Serial
Interface
system central
controllers
system select
thin small-outline
package
time-out timer
TOT
transceiver
transmitter
TSOP
TX
UART
UHF
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.
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.
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).
A type of dynamic random-access memory (DRAM) package that is
commonly used in memory applications.
A timer that limits the length of a transmission.
See time-out timer.
Transmitter-receiver. A device that both transmits and receives analog
or digital signals. Also abbreviated as XCVR.
Electronic equipment that generates and amplifies an RF carrier signal,
modulates the signal, and then radiates it into space.
See thin small-outline package.
Transmit.
See also Universal Asynchronous Receiver Transmitter.
Ultra-High Frequency.
Definition
Glossary