Cisco UBR10012 Quick Start Manual page 8

Overview
Figure 4
1
1 Fan assembly module
This fan assembly module works at four variable speed levels (0, 1, 2, and 3). The operating speed of the
fan is determined by the temperature of the facility. A thermistor, mounted on the fan assembly module,
is placed in front of the vent holes on the front panel. It measures the ambient air temperature on the
outside of the fan module. The threshold temperatures and speed levels are set internally and the fan
assembly controller monitors the thermistor and controls the speed of the fan. When powered on, the
fans operate at a speed according to the ambient average air temperature of the facility at the appropriate
speed level.
Note On startup, it may take up to 30 seconds for the fans to stabilize at the appropriate speed.
Three LEDs (FAN OK, SINGLE FAN FAIL, and MULTI FAN FAIL) indicate the status of the fan
assembly. In addition, there is a PRODUCT ID LED/switch on the front panel of the fan assembly
module.
Cisco uBR10012 Series Universal Broadband Router–Quick Start Guide
8
Fan Assembly Module (UBR10012-FAN-PLUS=)
CIS CO
100 00
CIS CO
100 00
U B R 1 0
0 1 2 -F A
N -P L U S
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OL-24972-01