BusinessPhone Communication Platform 4.0
Installation Instruction ASB 150 02

## Installation Of Alarm Interface Unit

The ALARM INTERFACE UNIT is an optional equipment mounted in the case bottom of the DBC 21x telephones. This equipment is used in the hospitality area to enable distress notification from e.g. a bathroom. A normally closed switch is installed and the two terminals are connected to the pins (button a and button b) on the option unit. The connection can be made in the wall outlet. Then the wiring shown above applies. If another type of wiring is used the connector Optional alarm can be used.

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