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Each selectable channel can be programmed for the conventional (analog or Project 25 
digital), SMARTNET/SmartZone, or Project 25 digital trunked operating mode. For 
example, Zone 1/Channel 1 could be a conventional channel, Zone 1/Channel 2 a 
SMARTNET channel, and so on. More information on these modes follows.

This is a non-trunked operating mode which accesses independent radio channels. There is 
no automatic access to several channels. Selecting a conventional channel selects a 
transmit and receive frequency and other channel parameters such as squelch control 
coding.

Conventional channels can be either standard (analog) or Project 25 (digital). With digital 
operation, the DSP (Digital Signal Processor) converts the audio signal to digital data 
which is sent over the air as complex tones. Another difference is that analog channels use 
Call Guard (CTCSS/DCS) squelch control and Project 25 channels use a NAC (Network 
Access Code) and talk group ID codes.

With Project 25 operation, a NAC is transmitted and it must match the NAC programmed 
in the base equipment and the mobile(s) being called for communication to occur. In 
addition, to receive standard group calls, the receiving mobile must be programmed to 
detect the transmitted talk group ID code.

With conventional operation, a busy channel condition is detected automatically if the 
busy channel lockout (transmit disable on busy) feature is programmed. Otherwise, it must 
be detected manually. An out-of-range condition is not indicated by special tones or 
messages as with SMARTNET operation because there is no initial data exchange with the 
repeater that allows this condition to be detected. Operating features unique to 
conventional channels are described in Section 5.

This is a trunked operating mode in which automatic access is provided to several RF 
channels. ID codes are used to select what mobiles are being called and what calls are 
received. Monitoring is performed automatically and special messages and tones indicate 
busy and out-of-range conditions.

SMARTNET and SmartZone operation and programming is very similar. Basically, 
SMARTNET operation is limited to a single repeater site and SmartZone operation allows 
automatic roaming between sites. Enhanced SMARTNET/SmartZone features include 
roaming (SmartZone only), telephone, private, and emergency calls, Call Alert

™

, and 

messaging. Either analog or digital signaling may be used.