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Chapter 1 - System Description
Network Processing Unit (NPU)
The Network Processing Unit is the "heart" of the BreezeMAX Base
Station. The NPU module serves as the central processing unit that
manages the base station's components and the SUs served by it. It also
functions as an IP router that aggregates the traffic from the AU
modules and transfers it to the IP Backbone through a dedicated
Gigabit/Fast Ethernet interface. The NPU main functions are:
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 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.
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BreezeMAX System Manual
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