Motorola APX 1000 User Manual page 131

MN000255A01-BL
Chapter 5: Glossary
Over-The-Air Rekeying
Allows the dispatcher to remotely reprogram the encryption keys in the radio.
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A one-way alert with audio and/or display messages.
Personality
A set of unique features specific to a radio.
PremierOne
A software application which streamlines critical real time operations and simplifies system
administration to deliver accurate, consistent and integrated information remotely to the requestors.
Preprogrammed
A software feature that has been activated by a qualified radio technician.
Private (Conversation) Call
A feature that lets you have a private conversation with another radio user in the group.
Private Line (PL)
A sub-audible tone that is transmitted such that only receivers decoding the tone receives it.
Programmable
A radio control that can have a radio feature assigned to it.
Push-to-Talk
PTT-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
RF-The portion of the electromagnetic spectrum between audio sound and infrared light (approximately
10 kHz to 10 GHz).
Repeater
Remote transmit/receive facility that re-transmits received signals in order to improve communications
range and coverage (conventional operation).
selective switch
Any digital P25 traffic having the correct Network Access Code and the correct talkgroup.
Squelch
Muting of audio circuits when received signal levels fall below a pre-determined value. With carrier
squelch, all channel activity that exceeds the preset squelch level can be heard.
Synchronous Serial Interface (SSI)
DSP interface to peripherals that consists of a clock signal line, a frame synchronization signal line,
and a data line.
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