The UNI-ISU can be controlled and monitored entirely from the remote CCU where local control is not desired. However, the unit can also be equipped with one or more LOCs. The Local Operator Console allows local control and activation even if communication to the CCU is interrupted and usually includes a microphone for local live PA.
Multiple LOCs may be connected to one UNI-ISU depending on power and distance restrictions. A large building may have multiple units. An LOC attached to one UNI-ISU can trigger all the units in that building without going thru remote CCU, again improving system resiliency.
Multiple communication options can connect the UNI-ISU to the Control Station including IP links (Ethernet, optic fiber, cell modem and satellite modem) as well as UHF/VHF radio. While requiring a licensed frequency and having limited bandwidth, 25-watt UHF/VHF radios allow system control over a fairly large area independent of 3rd party infrastructure such as wired network, cell towers or WiFi access points. ATI also supports having multiple communication paths (for example Ethernet LAN and UHF/VHF radio) operating simultaneously in parallel for the very highest system reliability.