User's Manual

Repeater
Remote transmit/receive facility that retransmits received signals in order to improve communications
range and coverage.
RF
Radio Frequency: The portion of the electromagnetic spectrum between audio sound and infrared light
(approximately 10 kHz to 10 GHz).
RSSI
Received Signal Strength Indicator; a dc voltage proportional to the received RF signal strength.
Rx
Receive.
SCM
Station Control Module; station controller.
SELV
Separated Extra Low Voltage.
Signal
An electrically transmitted electromagnetic wave.
SINAD
Acronym for the ratio of signal plus noise plus distortion and noise plus distortion.
SLR
Refers to Digital Professional Repeater model names in the MOTOTRBO Professional Digital Two-
Way Radio System.
Spectrum
Frequency range within which radiation has specific characteristics.
SPI
Serial Peripheral Interface (clock and data lines); simple synchronous serial interface for data transfer
between processors and peripheral ICs.
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.
TOT
Time-out Timer: A timer that limits the length of a transmission.
TPL
Tone Private Line.
MN003557A01-AA
Glossary of Terms and Acronyms
112 Send Feedback
Preliminary FCC Filing