Motorola APX 4500Li User Manual page 193

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 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.
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