Glossary-3
LED Light Emitting Diode: An electronic device that lights up when electricity is
passed through it.
LLGT Low Level Guard Tone
MAN_CS Manual Channel Select.
MDC Motorola Data Communications. 1200 or 4800 baud data signalling scheme.
MHz Megahertz: One million cycles per second. Used especially as a
radio-frequency unit.
MISO Master In, Slave Out.
MON Monitor.
MOSI Master Out, Slave In.
MRTI Microprocessor Radio-Telephone Interconnect; a Motorola system that
provides a repeater connection to the telephone network (The MRTI allows the
radio to access the telephone network when the proper access code is
received).
MSK Minimum Shift Keying
OSW Outbound Signalling Word, data packet transmitted on the outbound Trunking
control channel by the central controller that contains call assignment
information for the subscriber.
PA Power Amplifier that transmits final RF signal to transmit antenna
Paging One-way communication that alerts the Receiver to retrieve a message.
PC Board Printed Circuit Board. Also referred to as a PCB.
PFC Power Factor Correction
PL Private-Line tone squelch; a continuous subaudible tone that is transmitted
along with the carrier (A radio that has PL on the receive frequency will require
both the presence of carrier and the correct PL tone before it will unmute). Also,
if there is PL on the transmit frequency, all transmissions by the radio will be
modulated with the PL tone. Modulation will be continuous.
PLL Phase locked loop; a circuit in which an oscillator is kept in phase with a
reference, usually after passing through a frequency divider.
Programming Cable A cable that allows the CPS to communicate directly with the radio using
RS232.
PSTN Public Switched Telephone Network
PTT Push-to-talk; the switch located on the left side of the radio which, when
pressed causes the radio to transmit.
RA/RT Remote Access/Remote Transmit
RAC Repeater Access Control
Term Definition
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