Figure 2-9: Avu Drawer Front Panel; Table 2-14: Avu Leds - Nera WILINK I System Manual

Chapter 2 - Installation Guidelines
9 Connect the IF cable(s) (already connected at the other end to the AU-ODU(s))
to the ODU-1 connector(s) of the applicable AU-IDU module(s). To avoid
transmissions at undesired frequencies, verify that the frequency and
bandwidth parameters are properly configured before connecting the IF
cables.
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).
LED Status
PWR
Off
Red
Green
Green
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.
46
Connect the ground wire to the ground.

Figure 2-9: AVU Drawer Front Panel

Description
ALRM
Off No 5V power input
Red 12V power failed
Red One or more fans have failed
Off AVU operates properly

Table 2-14: AVU LEDs

WILINK I MODULAR BASE STATION SYSTEM MANUAL