Motorola APX 1000 Manual page 38

ADVANCED FEATURES
 Trunking System Controls
Site Trunking Feature
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.
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