User's Manual

Table Of Contents
58 Installation
Chapter 2 - Installation Guidelines
2.2.11 Air Ventilation Unit (AVU)
The 2U high, 84 HP wide AVU includes a 1U high integral chamber for inlet
airflow and a 1U high fan tray with an internal alarm module. To support a high
availability Base Station, the fan tray includes 10 brush-less fans, where 9 fans
are sufficient for cooling a fully loaded chassis. To further support high
availability, the chassis can operate with the hot-swappable fan tray extracted
from it for a period of time sufficient for replacing it (up to 10 minutes).
If the red ALRM LED is on while the PWR LED is green, it indicates a failure of at
least one fan. Although the Base Station chassis may continue operating with one
failed fan, it is recommended to replace the AVU as soon as possible.
2.2.12 Replacing Base Station Components
2.2.12.1 Replacing an AVU
Release the 4 screws securing the AVU to the chassis.
Using the handle take out the faulty chassis.
Figure 2-11: AVU Drawer Front Panel
Table 2-12: AVU LEDs
LED Status Description
PWR ALRM
Off Off No 5V power input
Red Red 12V power failed
Green Red One or more fans have failed
Green Off AVU operates properly
To replace an AVU drawer: