Ericsson MINI-LINK TN R4 ETSI Technical Description page 113

5.1.3 User Input/Output
The NPU1 B provides three User Input and three User Output ports. The NPU3
and NPU3 B provides two User Output ports. The SAU3 provides six User In
ports and three User Out ports.
The User Input ports can be used to connect user alarms to MINI-LINK Craft.
Applications like fire alarms, burglar alarms and low power indicator are easily
implemented using these input ports. The User Input ports can be configured to
be normally open or normally closed.
User Output ports can be used to export summary alarms of the accumulated
severity in the NE to other equipment's supervision system. The User Output
ports can be controlled by the operator or triggered by one or several alarm
severities.
The setup of the User Input/Output is done in the MINI-LINK Craft.
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