User's Manual

Draft 02 - Sep 1 2015
3-22 Viking Mobile Radio Operating Manual
General Operation
3.5.2 SMARTNET / SmartZone Mode
This is a trunked operating mode in which automatic access is provided to several RF
channels. ID codes are used to select what radios 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. SMARTNET/SmartZone features include roaming
(SmartZone only), telephone, unit, 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 6.
3.5.3 P25 Trunking Mode
The P25 Trunking 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 6. 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 also called Unit Calls.
• Telephone calls are available in this mode.