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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-04
Chapter 1 Cisco ASR 903 Router Overview
Cisco ASR 903 Router Features
AC Power Specifications
Fan Tray
The Cisco ASR 903 Router uses a modular fan tray that is separate from the power supply. The fan tray
contains twelve fans and provides sufficient capacity to maintain operation indefinitely in the event of
an individual fan failure.
The fan tray has the following hardware features:
• It provides side-to-side forced air cooling
• It provides redundant fans
• It is field replaceable
• It contains status LEDs
• It contains an alarm port with four external alarm inputs
Minimum output voltage -36/18 VDC
Maximum output voltage -72/36 VDC
Wire gauge for DC input power connections 12 AWG minimum for -48/-60 VDC.
8 AWG minimum for 24 VDC.
Connector accepts 8 AWG maximum.
Power dissipation 600 W
Table 1-3 AC Power Supply Specifications
Part number A900-PWR550-A
Input power specification 115VAC/ 230VAC
Input voltage 85/264 VAC
Minimum input voltage 85 VAC
Maximum input voltage 264 VAC
Minimum output voltage 12V
Maximum output voltage 12.4V
Power dissipation 600 W
Table 1-2 DC Power Supply Specifications
Part number A900-PWR550-D
Input power specification +24/-48 VDC
Input voltage -48/-60 VDC