Alvarion BreezeMAX 3500 System Manual page 29

Air Ventilation Unit (AVU)
The 2U high 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. A failure in
any of the fans is indicated by both the front panel LEDs and a trap
that is sent to the management system. 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 10
minutes).
Micro Base Station
The micro Base Station Unit is designed to provide an alternative and
low cost solution to the BreezeMAX full Base Station in places were the
number of subscribers is limited, and only one or two sectors are
necessary (i.e. communities areas). The use of the same AU-ODU that
is used by the modular Base Station provides an easy migration path
and protection of the initial investment when the customer base
increases and there is a need to replace the Micro Base Station with the
full, modular Base Station equipment.
The Micro Base Station equipment is comprised of an indoor Micro Base
Station Unit and an outdoor radio unit (AU-ODU).
Micro Base Station Indoor Unit
The Micro Base Station unit provides the full base station functionality
necessary for serving a single sector. There are two different models:
one is powered from the AC mains (110 or 220 VAC), and the other is
powered from a -48 VDC power source. The functionality of the Micro
Base station is very similar to the combined functionalities of NPU and
AU-IDU modules of the modular Base Station. The functionality of the
Micro Base Station unit includes:
Backbone Ethernet connectivity via a 10/100 Base-T network
interface.
Traffic classification and connection establishment initiation.
Policy based data switching.
Service Level Agreements management.
Manual Revision 1.0
Base Station Equipment
1-9