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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Power and LED Tests
Procedure: Isolate the Cause of Power Supply Problems
Step 1 If a single ONS 15327 show signs of fluctuating power or power loss:
a. Verify that the –48 VDC #8 power terminals are properly connected to a fuse panel. These power
terminals are located on the lower section of the backplane EIA under the clear plastic cover.
b. Verify that the power cable is #12 or #14 AWG and in good condition.
c. Verify that the power cable connections are properly crimped. Stranded #12 or #14 AWG does not
always crimp properly with Staycon type connectors.
d. Verify that 20 A fuses are used in the fuse panel.
e. Verify that the fuses are not blown.
f. Verify that a rack-ground cable attaches to the frame-ground terminal (FGND) on the right side of
the ONS 15327 EIA. Connect this cable to the ground terminal according to local site practice.
g. Verify that the DC power source has enough capacity to carry the power load.
h. If the DC power source is battery-based:
• Check that the output power is high enough. Power requirements range from –42 VDC to
–57 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 brown-outs occur, the power load and fuses might be too high for the battery plant.
Step 2 If multiple pieces of site equipment show signs of fluctuating power or power loss:
a. Check the uninterruptible power supply (UPS) or rectifiers that supply the equipment. Refer to the
UPS manufacturer’s documentation for specific instructions.
b. Check for excessive power drains caused by other equipment, such as generators.
c. Check for excessive power demand on backup power systems or batteries when alternate power
sources are used.
1.9.2 Power Consumption for Node and Cards
Symptom You are unable to power up a node or the cards in a node.
Table 1-42 describes the potential cause of the symptom and the solution.
Table 1-42 Power Consumption for Node and Cards
Possible Problem Solution
Improper power supply. Refer to power information in the Cisco ONS 15327 Procedure Guide.