Motorola ASTRO APX User Manual Supplement page 17

Digital
Signal
Front Panel
Program-
ming (FPP)
Network
Access
Code (NAC)
Operator
APX - FPP SUPPLEMENT 9
An RF signal that has a
pulsed or discrete, nature,
rather than a continuous
nature.
The provisioner is capa-
ble of changing
channel/zone names,
channel frequency, code,
digital/analog operating
modes, and bandwidth.
NAC operated on digital
channels to reduce voice
channel interference
between adjacent systems
and sites.
The person using the radio
to transmit and receive
audio. This is the primary
user in day to day radio
operation.