Motorola SSETM 5000 - Manual (Page 214)

November 11, 2004 6881094C12-A
Glossary-6
OSW See outbound signaling word.
OTAR See over-the-air rekeying.
outbound signaling
word Data transmitted on the control channel from the central controller to the
subscriber unit.
over-molded pad-
array carrier A Motorola custom IC package, distinguished by the presence of solder
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
squelch A continuous sub-audible tone that is transmitted along with the carrier.
Programmable
Read-Only Memory A memory chip on which data can be written only once. Once data has
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
power amplifier Amplifier having one or more active devices to amplify radio signals.
Term Definition