Motorola SSETM 5000 service manual Osw

Glossary-6

Term	Definition
OSW	See outbound signaling word.
OTAR	See over-the-air rekeying.
outbound signaling	Data transmitted on the control channel from the central controller to the
word	subscriber unit.
over-molded pad-	A Motorola custom IC package, distinguished by the presence of solder
array carrier	balls on the bottom pads.
over-the-air rekeying	Allows the dispatcher to remotely reprogram the encryption keys in the
	radio.
PA	Power amplifier.
paging	One-way communication that alerts the receiver to retrieve a message.
PC Board	Printed Circuit Board. Also referred to as a PCB.
phase-locked loop	A circuit in which an oscillator is kept in phase with a reference, usually
	after passing through a frequency divider.
pigtail	A short length of electrical conductor permanently affixed to a
	component, used to connect the component to another conductor.
pinout	A description of the purpose of each pin in a multi-pin hardware
	connection interface.
PL	See private-line tone squelch.
PLL	See phase-locked loop.
polarity	The positive or negative state in which a body reacts to a magnetic,
	electric, or other field.
private-line tone	A continuous sub-audible tone that is transmitted along with the carrier.
squelch
Programmable	A memory chip on which data can be written only once. Once data has
Read-Only Memory	been written onto a PROM, it remains there forever.
PROM	See Programmable Read-Only Memory.
PTT	See Push-to-Talk.
Push-to-Talk	The switch or button usually located on the left side of the radio which,
	when pressed, causes the radio to transmit. When the PTT is released,
	the unit returns to receive operation.
radio frequency	The portion of the electromagnetic spectrum between audio sound and
	infrared light (approximately 10 kHz to 10 GHz).
radio frequency	Amplifier having one or more active devices to amplify radio signals.
power amplifier

November 11, 2004 6881094C12-A