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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-04
Chapter 3 Installing the Cisco ASR 903 Router
Installing the Fan Tray
Installing the Fan Tray
The fan tray is a modular unit that provides cooling to the Cisco ASR 903 Router. Follow these steps to
install the fan tray in the chassis:
Step 1 Orient the fan tray so that the captive screws are on the left side of the fan tray’s front panel. Figure 3-11
shows how to orient the fan tray.
Figure 3-11 Installing the Fan Tray
Step 2
Guide the fan tray into the chassis until it is fully seated.
Caution The fans are exposed on the left side of the fan tray. Keep your fingers, clothing, and jewelry
away from the fans. Always handle the fan tray by the handle.
Note When installing the cabling to the RSPs, we recommend that you leave a service loop of extra
cabling sufficient to allow for fan tray removal.
Step 3 Secure the fan tray to the chassis using the attached captive installation screws. The recommended
maximum torque is 5.5 in.-lb (.62 N-m).
This completes the procedure for installing or replacing the fan tray in a Cisco ASR 903 Router.
For information about connecting cables to the fan tray alarm port, see “Connecting the Fan Tray Alarm
Port” section on page 3-42. For a summary of the LEDs on the fan tray, see “LED Summary” section on
page 5-7. For more information about air flow guidelines, see Air Flow Guidelines, page 2-11.
Removing and Replacing the Fan Tray
The fan tray supports online insertion and removal (OIR). There is no need to power down the
Cisco ASR 903 Router to remove or replace the fan tray. However, the router will shut down if the fan
tray is removed from the chassis for more than five minutes.
GE-0 GE-1 GE-2 GE-3 GE-4 GE-5 GE-6 GE-7
PWR
STAT
GE-0 GE-1 GE-2 GE-3 GE-4 GE-5 GE-6 GE-7
PWR
STAT
GE-0 GE-1 GE-2 GE-3 GE-4 GE-5 GE-6 GE-7
PWR
STAT
PWR
STAT
L 0 S L 1 S L 2 S L 3 S L 4 S L 5 S L 6 S L 7 S
PWR
STAT
L 0 S L 1 S L 2 S L 3 S L 4 S L 5 S L 6 S L 7 S
PWR
STAT
L 0 S L 1 S L 2 S L 3 S L 4 S L 5 S L 6 S L 7 S
INPUT
OK
OUTPUT
FAIL
24V—60V 28A
INPUT
OK
OUTPUT
FAIL
24V—60V 28A
281934
RUDY RSP
MEM TOD BITS MGMT
ENET
1PPS
IN
1PPS
OUT
1OMHZ
OUT
1OMHZ
IN
CONSOLE
SYNC
ACT
PWR
STAT
ALARM
FAN TEMP
CRIT MAJ MIN