Ericsson RBS 2106 Reference Manual page 193

Control and Supervision Circuits
The control and supervision circuits support:
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The output voltage can be adjusted between 22 V to 29 V DC. The
control and supervision is achieved through an optical signal interface
connector on the front of the PSU.
15.2.2 Functions
The PSU DC has the following functions:
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Communication
The PSU communicates with its superior unit (DXU) through an optical
interface. The PSU is controlled and supervised through this interface.
In the event of communication failure, the PSU continues working with
default values.
Alarms
The following alarms are detected in the converter and are then
forwarded to the DXU, and an indicator is illuminated on the PSU front:
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Voltage Adjustment
The desired value of the output voltage of the rectifier is set by the
ECU function in the DXU. The PSU has a default value of 27.2 V. The
DXU adjusts the individual PSU voltage to maintain the required
system voltage.
EN/LZT 720 0008 P2A
2001-11-28
load sharing between parallel units
remote on/off
alarms
Communication
Handling Alarms
Voltage adjustment
Power Limitation
Converter failure
Input fault
Input undervoltage
Input overvoltage
Output overvoltage hardware alarm
Output overvoltage software alarm
High internal temperature
Power limit
Short circuit/overload for more than one minute
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Unit Description, PSU 1200 W
191 (485)