Motorola SSETM 5000 - Manual (Page 216)

November 11, 2004 6881094C12-A
Glossary-8
Serial Audio CODEC
Port SSI to and from the GCAP II IC CODEC used to transfer transmit and
receive audio data.
Serial Peripheral
Interface How the microcontroller communicates to modules and ICs through the
CLOCK and DATA lines.
serial port A hardware interface on a radio that transmits data one bit at a time.
sideband The band of frequencies on either side of the carrier frequency,
produced by modulation of a carrier wave.
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.
station One or more transmitters or receivers, including the accessory
equipment, necessary at one location for carrying on radio
communication services.
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).
Term Definition