Motorola SSETM 5000 service manual Sram

Glossary-8

Term	Definition
Serial Audio CODEC	SSI to and from the GCAP II IC CODEC used to transfer transmit and
Port	receive audio data.
Serial Peripheral	How the microcontroller communicates to modules and ICs through the
Interface	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	An operating mode in which the radio is muted, but still continues to
mode	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	A computer-adjustable electronic attenuator.
potentiometer
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	DSP interface to peripherals that consists of a clock signal line, a frame
Interface	synchronization signal line, and a data line.
system central	Main control unit of the trunked dispatch system; handles ISW and
controllers	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).

November 11, 2004 6881094C12-A