Nera WILINK I System Manual page 19

Chapter 1 - System Description
Aggregate backbone Ethernet connectivity via a 100/1000 Base-T network
interface.
Traffic classification and connection establishment
initiation.
Policy based data switching.
Service Level Agreements management.
Centralized agent in the Base Station to manage all cell
site's AUs and all registered SUs.
Base Station overall operation control, including AU diagnostic and control,
PSU monitoring, AVU management and redundancy support.
Alarms management, including external alarm inputs and activation of
external devices (future option).
Synchronization, including GPS antenna interface (future option), clock and
IF reference generation and distribution to the Base Station modules as well
as to other collocated Base Station chassis.
An SNMP agent incorporated into the NPU enables extensive In Band (IB)
management of the Base Station and all its registered SUs. Out Of Band (OOB)
management is supported through a dedicated 10/100 Base-T interface. A serial
RS-232 port supports local configuration, monitoring and debugging.
Two NPU modules can be used to provide a 1+1 redundancy scheme. The
redundancy mechanism, to be supported in future releases, will be based on a
Master <-> Slave principle, where the slave is in passive mode and is constantly
updating all the learning tables and networking parameters of the master card.
1.2.3 Access Unit (AU-IDU)
The double Euro AU-IDU module contains the wireless
IEEE 802.16-2004 based MAC and modem and is responsible
for the wireless network connection establishment and for
bandwidth management. Each AU-IDU connects to the NPU via
the back plane. In addition, each AU-IDU connects to all other
AU/NIU slots via the back plane over a shared bus for future
support of TDM traffic connectivity.
Each AU-IDU includes two 3.5/1.75 MHz PHY channels that
can connect to one or two ODUs. The AU-IDU module connects
to the AU-ODUs via Intermediate Frequency (IF) cables carrying
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WILINK I MODULAR BASE STATION SYSTEM MANUAL