Nikon CM200 service manual Osw, Pll, Ptt, Ram, Reset, Rf Pa, Rib, Rom, Rssi, Rpt/Ta, Tot

G-ii		Glossary
	OSW	Outbound Signalling Word: data transmitted on the control channel from the
		central controller to the subscriber unit.
	PC Board	Printed Circuit Board
	PL	Private-Line® tone squelch: a continuous sub-audible tone that is transmitted
		along with the carrier.
	PLL	Phase-Locked Loop: a circuit in which an oscillator is kept in phase with a refer-
		ence, usually after passing through a frequency divider.
	PTT	Push-To-Talk: the switch located on the left side of the radio which, when
		pressed, causes the radio to transmit.
	RAM	Random Access Memory: the radio’s RAM is loaded with a copy of the
		EEPROM data.
	Registers	Short-term data-storage circuits within the microcontroller.
	Repeater	Remote transmit/receive facility that retransmits received signals to improve
		communications coverage.
	RESET	Reset line: an input to the microcontroller that restarts execution.
	RF PA	Radio Frequency Power Amplifier
	RIB	Radio Interface Box
	ROM	Read Only Memory
	RSSI	Received Signal-Strength Indicator: a dc voltage proportional to the received
		RF signal strength.
	RPT/TA	Repeater/Talk-Around
	Softpot	Software Potentiometer: a computer-adjustable electronic attenuator
	Software	Computer programs, procedures, rules, documentation, and data pertaining to
		the operation of a system
	SPI (clock and data	Serial Peripheral Interface: how the microcontroller communicates to modules
	lines)	and ICs through the CLOCK and DATA lines.
	Squelch	Muting of audio circuits when received signal levels fall below a pre-determined
		value
	Standby Mode	An operating mode whereby the radio is muted but still continues to receive
		data
	System Central Con-	Main control unit of the trunked dispatch system; handles ISW and OSW mes-
	troller	sages 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).
	TOT	Time-Out Timer: a timer that limits the length of a transmission.
	TPL	Tone Private-Line
	µC	Microcontroller