Chapter 3 ______________________________________________________ Functional Description
VAISALA_______________________________________________________________________ 29
CDU Software Components
The CDU includes the following software components (minimum level):
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Operating system: Windows® Server 2008 (Windows® Server 2003
in upgrades)
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Device drivers for serial communications adapter
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AviMet system programs (Processes and applications)
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AviMet configuration files (INI files)
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TCP/IP Protocol network software
To ensure maximum system reliability, an AviMet system can also be
duplicated. A duplicated system contains two CDUs. For more information
on duplicated systems, see section
UPS
The Uninterrupted Power Supply (UPS) is crucial for ensuring high system
availability. Customers can also use their own arrangements for ensuring
uninterrupted power supply.
LAN
The communication between the applications is based on the TCP/IP
protocol. In systems that include several workstations, the workstations are
connected to each other by a local area network (LAN).
Serial/LAN Adapter
The serial/LAN adapter communicates with the sensors using serial line
protocols and then converts these messages to LAN (TCP/IP protocol).
CAUTION
A missing or defective UPS arrangement can result in data loss and
incorrect operation of the system.
CAUTION
Congested LANs, or LANs with excessive downtime can result in data
loss and incorrect operation of the AviMet system. Vaisala recommends
a load of less than 10 % of the network bandwidth and an availability of
at least 99.9 %.