38
 Trunking System Controls 
Site Trunking Feature
ADVANCED FEATURES
If the zone controller loses communication with any site, that 
site reverts to site trunking.
The display shows the currently selected zone/channel 
combination and Site trunking.
What does it mean when my radio says “SITE 
TRUNKING?”
If a significant failure caused the radio tower sites to lose their 
connection to the master site (possibly due to a zone 
controller failure), they can operate independently in “site 
trunking” mode. Users will be able to communicate between 
towers but will be unable to reach a dispatch center 
console. The radio display will alternate between “SITE 
TRUNKING” and the name of the selected talkgroup.
Dispatchers will receive an audible alarm on 
their PSAP backup control station radio, prompting them to 
turn on portable radios. Their consoles will not be able to use 
network talkgroups during site trunking mode.
Note: When this occurs, you can communicate only with 
other radios within your trunking site.