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User’s Manual for Node C Network Elements

 

Page 82 

PRELIMINARY M0121A1A_uc.doc

 

 
The distribution & alarm board of the Interface Unit is the main connection point for 
the user. It has the external alarm clamps, RS232 connectors, for local or modem 
connection, as well as a summary alarm relays. The following figures show one blank 
board and an installed one with battery backup.  
 
 

 

 

*  Only these connectors are for general customer use. All others are designated above for 

informative purposes, and required, only, e.g. for an upgrade or replacement of parts. 

Battery charge module 

Internal I

2

C 

Power supply alarming / I

2

C 

Remote (RS232)* 

Internal PSTN connector 

External alarms & PSTN * 

Door switch 

Summary alarm*; see chapter 
5.2.7 for pin assignment  

Local (RS232) * 

Battery backup connector 

Vdc for modem * 

USB connector for modem* 

Mains surveillance 

Battery load discharge (resistor) 

Modem fuses (2.5 A) 

Modem cable (RF connection)