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but can also interface to PAs and Fire Alarms to leverage existing in-building systems . The ISU is also available with an optional strobe power supply that includes synchro- nization between strobes as is required in many circum- stances .
ISUs can be controlled and monitored entirely from the remote CCU where local con- trol is not desired . However , units can also be equipped with one or more Local Op- erator Consoles ( LOCs ).. The LOC allows local control and activation even if communi-
Figure 3 . ATI Systems LOC is used to locally control , monitor , and activate an at- tached remote terminal unit such as a HPSS , ISU , or PA unit .
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