6816812H01 March 23, 2006
Glossary-7
signal An electrically transmitted electromagnetic wave.
Signal Qualifier
mode
An operating mode in which the radio is muted, but still continues to
analyze receive data to determine RX signal type.
softpot See software potentiometer.
software Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
software
potentiometer
A computer-adjustable electronic attenuator.
spectrum Frequency range within which radiation has specific characteristics.
SPI See Serial Peripheral Interface.
squelch 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.
SRAM See static RAM.
SSI See Synchronous Serial Interface.
Standby mode An operating mode in which the radio is muted but still continues to
monitor data.
static RAM A type of memory used for volatile, program/data memory that does not
need to be refreshed.
Synchronous Serial
Interface
DSP interface to peripherals that consists of a clock signal line, a frame
synchronization signal line, and a data line.
system central
controllers
Main control unit of the trunked dispatch system; handles ISW and
OSW messages to and from subscriber units (See ISW and OSW).
system select The act of selecting the desired operating system with the system-select
switch (also, the name given to this switch).
thin small-outline
package
A type of dynamic random-access memory (DRAM) package that is
commonly used in memory applications.
time-out timer A timer that limits the length of a transmission.
TOT See time-out timer.
transceiver Transmitter-receiver. A device that both transmits and receives analog
or digital signals. Also abbreviated as XCVR.
transmitter Electronic equipment that generates and amplifies an RF carrier signal,
modulates the signal, and then radiates it into space.
TSOP See thin small-outline package.
Term Definition
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