8M083X25 Rev. 14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 152 of 153
Keyword
Description
Mode
MSU / PSU
- A programmed combination of operating
parameters.
DVR
– OFF, SYSTEM or LOCAL (see
DVR Mode
)
MPE
Maximum Permissible Exposure.
MSU
Mobile Subscriber Unit
NAC
Network Access Code
– used in P25 mode for validation of
P25 radio communications, similar to the use of PL/DPL in
analog mode. Also used for DVRS Steering.
NID
Network ID - see Network Access Code (NAC)
Outbound Call
System Call received by the MSU.
PSU
Portable Subscriber Unit.
PTT
Push to talk. The PTT engages the transmitter (of the Portable
or Mobile radio and / or DVR) when pressed.
RF
Radio Frequency. Part of the general frequency spectrum
10kHz - 10,000,000 MHz.
RSSI
Received Signal Strength Indicator.
System Mode
DVR mode which provides extended voice and signaling
communications between System Users and Local Portable
Users over the selected DVR channel / Mobile Radio Mode.
Talk Group
A group of radio users who communicate with each other by
using the same communication path.
Talk Group
Translation
Feature where the PSU talkgroup is translated by the DVR to
match the currently selected MSU talkgroup.
Trunking
The automatic sharing of radio frequencies by large number of
users based on communication path sharing for the length of a
conversation.
Tweaker
DVRS Programming Software Application
