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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 2 PEM Faults and Fan Assembly Failures
Other Electrical Problems
The power shelf includes three 1200-watt (W) AC-input power modules that plug into a common power
backplane in the 2400W AC-input power shelf. Two 1200W AC-input power modules are capable of
powering a fully configured Cisco uBR10012 router. The third power module provides full redundancy.
During normal operation, the three AC-input power modules provide automatic load-sharing with each
power module supporting 33 percent of the power load. When you remove one of the AC-input power
modules, the remaining power modules immediately ramp up to full power and maintain uninterrupted
system power for a limited time. This allows you to replace the affected module without impacting
system operations.
Faults on the 2400W AC-input power shelf can occur for the following reasons:
• The AC-input power to one or more power modules has failed.
• The AC power plug to one or more power modules has been removed or unplugged.
• One or more power modules has failed and must be replaced.
Figure 2-4 illustrates the AC PEM and its indicators. Table 2-5 describes the indicators.
Figure 2-4 AC-Input Power Shelf Front Panel
Other Electrical Problems
If the electrical problem cannot be traced to a PEM, check the unit for:
• Improper power cable connections to the Cisco uBR10012 router
• Improper installation of other field-replaceable units (FRUs)
Table 2-5 AC-Input Power Shelf Module LEDs
LED Color Description
AC OK Green The AC-input power to the power module is present and is within the proper
range.
DC OK Green The power module is producing DC output power in the proper range.
FAULT Red This particular power module has failed and must be replaced. The 2400W
AC-input power shelf can continue operating with only two out of the three power
modules installed, but the failed module should still be replaced as soon as
possible.
36137
D
C
O
K
A
C
O
K
F
A
U
L
T
D
C
O
K
A
C
O
K
F
A
U
L
T
D
C
O
K
A
C
O
K
F
A
U
L
T
DC OK
AC OK
FAULT