Motorola APX 6000 User Manual page 159

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 Call
A feature that allows you to call a selected individual, intended to provide privacy and to eliminate
the annoyance of having to listen to conversations of no interest to you.
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.
Standby
An operating condition whereby the radio's speaker is muted but still continues to receive data.
Status Calls
Pre-defined text messages that allow the user to send a conditional message without talking.
Tactical/non-revert
The user will talk on the channel that was selected before the radio entered the emergency state.
TalkAround
Bypassing a repeater and talking directly to another unit for local unit-to-unit communications.
Talkgroup
68012001079-JW
Glossary
159