Figure 2-10: Avu Drawer Front Panel; Table 2-14: Avu Leds - Alvarion BreezeMAX 3500 System Manual

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 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 may operate with the
hot-swappable fan tray extracted from it for a period of time sufficient
for replacing it (up to 10 minutes).
LED Status
PWR ALRM
Off Off
Red Red
Green Red
Green Off
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.
To replace an AVU drawer:
1. Release the 4 screws securing the AVU to the chassis.
2. Using the handle take out the faulty chassis.
3. Insert a new AVU drawer and close the screws. The replacement
should be completed in less than 10 minutes.
Manual Revision 1.0
Installing the Modular Base Station Equipment

Figure 2-10: AVU Drawer Front Panel

Table 2-14: AVU LEDs

Description
No 5V power input
12V power failed
One or more of fans failed
AVU operates properly
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