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Normal Router Startup Sequence
• Chassis backplane power distribution—System transfers +12 VDC power from the power modules to
• Processor subsystem—Includes the active Route Processor (RP) card with line card. The RP is equipped
• Cooling subsystem—The Cisco ASR 9001 Router has one fan tray (with 14 fans). The Cisco ASR 9901
Normal Router Startup Sequence
You can generally determine when and where the router failed during the startup sequence by checking the
status LEDs on the power modules and RP.
In a normal router startup sequence, this sequence of events and conditions occur:
Procedure
Step 1
The fan in each power module receives power and begins drawing air through the power supply.
The power module input power and output power indicators are on.
Step 2
The fans in the fan tray receive power and begin drawing air through the chassis.
The fan tray OK indicator is on.
Step 3
As the power-on and boot process progresses for the RP, the status of the RP appears on the front panel of
the card.
Identifying Startup Issues
The following table shows the LED states on the power modules (AC or DC), RP, and the fan tray after a
successful system startup.
Table 15: LEDs at System Startup
Component
Type of Indicator
Line Card
Status LED
AC Power Modules
Power status LEDs
DC Power Modules
Power status LEDs
Cisco ASR 9901, ASR 9001, and ASR 9001-S Routers Hardware Installation Guide
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the chassis backplane and distributes it to all the cards through the backplane connectors. The fan tray
receives power from the chassis backplane and communicate to the RP CAN Bus controller.
with onboard processors. The RP downloads a copy of the Cisco software image to the line card processor.
Router has three fan trays. The fan trays circulate cooling air through the chassis.
Display Contents/LED Status and Meaning
Green: The line card is enabled and ready for use.
Green (ON): Input AC power OK.
Amber (OFF): No fault is present. The correct power module voltages are
present and no faults have been detected.
Green (ON): Input DC power OK.
Amber (OFF): No fault is present. The correct power module voltages are
present and no faults have been detected.
Troubleshooting the Installation
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Troubleshooting
