Cisco ONS 15600 SDH Troubleshooting Manual page 108

1.10 Power Supply Problems
If the DC power source is battery-based:
h.
•
•
•
•
If multiple pieces of site equipment show signs of fluctuating power or power loss:
Step 2
Check the uninterruptible power supply (UPS) or rectifiers that supply the equipment. Refer to the
a.
UPS manufacturer's documentation for specific instructions.
Check for excessive power drains caused by other equipment, such as generators.
b.
Check for excessive power demand on backup power systems or batteries when alternate power
c.
sources are used.
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
1-76
Check that the output voltage is in the specified range from –40.5 VDC to –72 VDC.
Check the age of the batteries. Battery performance decreases with age.
Check for opens and shorts in batteries, which might affect power output.
If brownouts occur, the power load and fuses might be too high for the battery plant.
Chapter 1 General Troubleshooting
July 2010