E.F. Johnson Company 53SL ES Series, Руководство по эксплуатации

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6-16 53SL ES Series Mobile Radio Operating Manual April 2009
Project 25 Mode Features Section 6 - Conventional Mode Features
6.13 Project 25 Mode Features
The following features are unique to conventional P25 channels.
6.13.1 Digital Unit ID
Each radio that operates on Project 25 (digital) channels is programmed with an up-to-
eight-digit unit ID. This ID is unique for each radio and can be any number from 1-
16,777,215. When power is turned ON with a Project 25 channel selected, this ID is
briefly displayed.
6.13.2 Talkgroup ID
Each Project 25 channel is programmed with a group ID that determines which group of
mobiles will receive the call. A call is received on a channel if a selected or scanned
channel is programmed with that ID and the correct NAC is detected (see following).
Group IDs can be any number from 1-65,535. Group ID detect can be disabled by the
Normal/Selective squelch function described in Section 6.4 and the Monitor Mode
described in Section 6.2.
6.13.3 Network Access Code (NAC)
Project 25 conventional channels also use a NAC (Network Access Code) to control which
calls are received on a channel. The NAC can be 1-4095, and each transmit and receive
channel can be programmed for a different code. Other operation, such as monitoring
before transmitting, is similar to that of analog channels. NAC (and group ID) detect can
be disabled by the monitor mode described in Section 6.2.
6.13.4 EFJohnson System Out of Range Indicator
The radio can be programmed to provide an out of range indicator when used on an
EFJohnson Infrastructure system. If the radio fails to receive the beacon signal from the
system, then (if programmed) an out of range status will be indicated on the radio by a
tone, display, or tone and display.