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APCO P25 MODE OPERATION
n General
APCO Project-25 (P25) is designed for public safety digital
radio, and allows you to make a call to a specific station (In-
dividual call) or to a particular group (Talkgroup call or An-
nouncement call*) in the Conventional and Trunking mode.
Other P25 transceivers on the channel will not listen in on a
call that does not match their Individual/Talkgroup/announce-
ment group ID or Network Access Code (NAC).
Moreover, the following functions and calls are available:
Pager function, Radio Inhibit/Uninhibit function, Radio Moni-
tor function, Radio Check function, Status Message, Short
Message, Status Query, Phone Call, Emergency Call and
Encryption function.
NAC matching is not necessary for the above functions and
calls.
Each transceiver has a unique ID, and it allows to be substi-
tuted with an alphanumeric name, if programmed.
You can use this ID (or name) to select a target station to call,
and the ID (or name) of the target station is displayed after
receiving a call.
*Trunking mode only
✔ IMPORTANT for Trunking mode operation:
• The public Trunking transceiver should be registered and
group affiliated with the control channel in a current re-
peater system, to be operated in the Trunking mode.
After the registration and group affiliation are successful,
the Trunking operation can be performed.
• When the Full Off Air Call SetUp (FOACSU) function is
turned ON, beeps sound after receiving an Individual call
on the Trunking mode, which is a request for the user’s
permission to accept the call. (p. 32)
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