Removing The Dust Filter; Dust Filter Maintenance; Removing And Replacing The Fan Tray - Cisco ASR 903 Installation Manual

Installing the Cisco ASR 903 Router
Step 5
Follow the steps to install the fan tray in the chassis. See

Removing the Dust Filter

The dust filter must be removed for a replacement.
Note The dust filter is a single-use component.

Dust Filter Maintenance

A periodic health check of the filter, every three months based on the level of dust in the environment, helps
in avoiding over clogging of the filters and provide a better life. This product's filter is used as a single-use
component. If the product is installed in a controlled environment, check and replace the filter every three
months, otherwise replace the filter every month with PID (A903-FAN-F=) or equivalent.
Step 1 Remove the dummy cover from the fan tray.
Step 2
Remove the dust filter from the fan.
Note The filter can be accessed by pulling the pull tab by using fingers or pliers. See the figure in section
(A903-FAN-E), on page
Step 3
Slide the replacement dust filter onto the fan tray
Step 4 Insert the dummy cover onto the fan tray to secure the filter within the chassis.

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, there is a finite time to replace the fan tray. This time
depends upon the specific RSP and fan tray combination and also the ambient temperature. The following
table provides the time interval for replacing the fan tray. At higher ambient temperatures, the replacement
time is lower.
Note If a fan tray is removed, and not replaced within the stipulated time the system will automatically power-off.
The actual shutdown time depends on few parameters like the total traffic load, ambient temperature, type of
fan tray that is used and the dust filter condition (if a filter is present). If the system is powered with PSUs
other than 900W DC or 1200W AC and if the system is powered off, then the system should be completely
powered off for 30 seconds with all the PSU in the system simultaneously, and then turned on for the system
to power on.
Installing the Fan Tray, on page
10.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
Removing the Dust Filter
86.
Fan Tray
87