User's Manual

Node B Rack Mount Installation Guide
Version 0.0.0 Page 33 of 42
Step 11 Alarm Connections
If local alarms are to be utilised two Dtype connectors are been provided on the Node B
digital shelf. The specifications for those interface requirements are below:-
The maximum input voltage is restricted to 39V for a 500A 8/20 uS pulse, with a minimum
working voltage of 18V. All six input circuits are the same.
Figure 6-17 : Alarm Outputs & Inputs