The alarm port on the rear panel uses a standard DB-15 connector that provides a connection for a Telco dry alarm relay cable. In a telecommunications environment, use this port to connect to the central office alarming system. The alarm port relay contacts are rated for 100V, 0.2A maximum.
Each alarm has a corresponding alarm LED on the front panel:
ALARM0 and the Critical LED
ALARM1 and the Major LED
ALARM2 and the Minor LED
ALARM3 and the User LED