Cisco ASR 1000 Series - Page 83

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Cisco ASR 1000 Series Aggregation Services Routers Hardware Installation Guide
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Chapter 2 Cisco ASR 1000 Series Routers Component Overview
Power Supplies for the Cisco ASR 1002 Router
input voltage has reached 20.0 volts +/- 0.5 volts. Once the turn-on threshold of 20 volts is reached, then
the +24 VDC power supply meets all specification requirements down to low voltage threshold of 19
volts (+/- tolerance).
+24 VDC Power System Output for Cisco ASR 1002 Router
The +24 VDC power supply output tolerance is defined in Table 2-26 under all combinations of +24
VDC input line variation. Total system power consumption should not exceed 470 watts or output rating
of each power supply.
Note Two power supplies are used for redundant operation. System total power consumption shall never
exceed rating of one power supply to maintain redundancy.
Note Any combination of output voltage/currents cannot exceed total power rating of 470 Watts.
+24 VDC Power Supply Important Notices
The following items list important notes regarding the +24 VDC power supply in the Cisco ASR 1002
Router:
• Output Voltage Alarm Threshold—The Output Voltage Alarm is declared when the output voltage
is below the low end of the minimum or above the high end of the maximum limits (as shown in
Table 2-27). When the output voltage is above the high end of the minimum or below the low end
of the maximum limits, then the Red state is not activated.
• Temperature—If a single fan fails, the power supply meets the functional requirements specified in
Table 24. Above 55°C with less than two fans, calculated MTBF does not apply; however all
component stress remains within the manufacturer’s specified rating.
Table 2-26 Cisco ASR 1002 Router +24 VDC Power System Output Voltage and Current
Output Voltage +12 VDC +3.3 V
Minimum 11.80 3.20
Nominal 12.00 3.30
Maximum 12.20 3.40
Output Current
Minimum 2.0 A 0.10 A
Maximum 39 A 3.125 A
Table 2-27 +24 VDC Output Voltage Alarm Threshold Ranges
Output Minimum Maximum
12V 10.0-11.2V 12.8-13.8V
3.3V 2.6 – 3.0V None