Motorola XTL 1500, Detailed Service Manual, Page: 438 / 452

6815854H01-A June 15, 2005
Glossary-7
RESET Reset line: an input to the microcontroller that restarts execution.
RF See radio frequency.
RF PA See radio frequency power amplifier.
RIB See Radio Interface Box.
ROM See read-only memory.
RPCIC Regulator/power control IC.
RPT/TA See repeater/talkaround.
RSS See Radio Service Software.
RTC See real-time clock.
RX Receive.
RX DATA Recovered digital data line.
SAP See Serial Audio CODEC Port.
Serial Audio CODEC
Port SSI to and from the GCAP II IC CODEC used to transfer transmit and
receive audio data.
Serial
Communication
Interface Input Line A full-duplex (receiver/transmitter) asynchronous serial interface.
SCI IN See Serial Communication Interface Input Line.
Serial Peripheral
Interface How the microcontroller communicates to modules and ICs through the
CLOCK and DATA lines.
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.
Term Definition