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Hardware Component Descriptions
To ensure adequate airflow across the Cisco uBR7225VXR power supplies, a power supply or a power
Caution
supply filler plate (with its attached air dam) must be installed in each power supply bay.
See
Note
power specifications, including input voltage and operating frequency ranges.
The Cisco uBR7225VXR power supply shuts itself down when the input AC voltage, the output DC
voltage, or the internal temperature of the chassis exceeds allowable tolerances. When this occurs, one
or both of the power supply front panel LEDs will turn red. The Cisco uBR7225VXR power supply must
then be reset by manually switching the power switch off and then back on to allow the router to recover.
When the input power to Cisco uBR7225VXR power supply is disconnected or lost, the power supply
Caution
enters a reset cycle for 10 seconds. Wait at least 10 seconds or move the power switch from one position
to the other to restart the power supply. For example, if the power supply was on when the power was
disconnected or lost, move the power switch to the off position and then back to the on position. If you
do not wait the full 10 seconds or move the power switch from one position to the other, the power supply
does not restart.
Fan Trays
The fan tray for the Cisco uBR7225VXR router, shown in
attached to a metal tray, is located on the left side of the chassis (when viewing the router from the front)
and receives 12 VDC through a DC power harness that connects directly to the router midplane.
Temperature sensors on the network processing engine monitor the internal air temperature and send
warning messages when the internal air temperature approaches a specified threshold. If the internal
temperature exceeds the specified threshold, the system environmental monitor shuts down all internal
power to prevent equipment damage from excessive heat.
The Cisco uBR7225VXR router fan tray is not a field-replaceable unit.
Note
Figure 1-9
The fan tray draws cooling air in through the intake vent on the right side of the chassis (when viewing
the router from the front) and moves the air across the internal components and sends it out through the
exhaust vent on the left side of the chassis.
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
1-14
Appendix A, "Cisco uBR7225VXR Router Specifications,"
Cisco uBR7225VXR Fan Tray
Chapter 1
for AC-input power supply system
Figure
1-9, consisting of three fans that are
Figure 1-10
shows the airflow through the router.
Cisco uBR7225VXR Overview
OL-17309-01
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Troubleshooting
