E F Johnson Company 2425M70 Benutzerhandbuch

4-14

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. SMARTNET/SmartZone features include roaming 
(SmartZone only), telephone, private, and emergency calls, Call Alert

™

, and messaging. 

Either analog or digital signaling may be used. Enhanced SMARTNET/SmartZone 
features provide the same, plus gives you responses from the system. For example, if the 
ID you are calling is turned OFF, the system will display “NOT AVAILABLE”.

When a SMARTNET or SmartZone channel is selected or the radio is powered up on one 
of those channels, it searches for a control channel. While searching, the alias (name) of 
the selected channel is displayed and the radio attempts to register on the trunked system. 
If a control channel could not be found (because of an out of range condition or the system 
ID is not correct, for example), “NO SYS” (early units) or “OUT OF RNG” (later units) is 
displayed and the radio continues to search for a control channel.

The control channel transmits and receives system information to and from all radios 
registered on the system. Therefore, once a control channel is found, it is continuously 
monitored for incoming call information and is used to make call requests. When the radio 
is keyed, a channel grant request is sent through the control channel. The system then 
informs the requesting radio what traffic channel to use, through the control channel. Once 
the request is granted by the system, the radio moves to the designated traffic channel for 
the actual talkgroup call. Once the transmission has ended, the radio returns to the control 
channel.

Operating features unique to SMARTNET/SmartZone channels are described in 
Section 7.

The P25 Trunked operating features are very similar to the SmartZone type just described. 
Since SmartZone features are also similar to SMARTNET features, all three modes are 
described in Section 7. Some differences between the P25 Trunking and SmartZone 
modes are as follows:

• Digital signaling is always used with P25 calls. Either analog or digital signaling may be 

used for SmartZone calls.

• Calls made to a specific radio in the P25 mode are called Unit Calls. In the 

SMARTNET/SmartZone mode they are called Private Calls.

• Messaging is not available with P25 calls.

• Telephone calls are available in this mode.

• The P25 control channel data rate is 9600 baud and the digital voice data rate is also 

9600 baud. With SmartZone operation, the control channel data rate is 3600 baud (both 
digital and analog calls) and the narrowband digital voice data rate is 9600 baud.