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5 Functional Description 

 

ID No: 161692 

PRELIMINARY 

Page 83

 

 
The power supply, which is mounted in the Interface Unit, transforms AC mains 
power into a predefined DC voltage. When performing maintenance, ensure that all 
circuits are voltage-free and that the Node C is disconnected from mains. 

The Node C may be equipped with a second power supply for redundancy. 
 

 

 

 
The actual configuration can be seen at the configuration list*, which is part of the 
delivery. 

* 

To be replaced by an electronic list that will be accessible via software. 

 

 
The modem is used to establish a remote connection to the Node C. The connection 
may be used to change the unit’s parameters, check and clear alarms or collect 
measurement and quality statistics.  
 
Furthermore, the modem is at the Node C’s request to alert the operator when there 
is an alarm. The modem may be over-the-air (wireless) or PSTN. It is possible to 
install the wireless modem or the PSTN modem on site.