User's Manual

UL-801 Installation Manual
Page 6
23-20-06 15 December 2011
The Customer Database (CDB)-driven user interface and message set can be customized to
match airline or business operator’s operational requirements. Each database is described
below.
• Customer Database
Contains screen and message definitions for Aeronautical Operational Communications
(AOC) and Air Traffic Services (ATS) applications. Contains user definitions for uplink
and downlink messaging, and a flight database that defines how data is formatted and
stored, and event triggers used for responses to system events.
A 32-bit CRC is employed to confirm database integrity at loading, initialization, and
during flight. The customer database also has a version number that is checked upon
loading for compatibility with the application software. If the customer database CRC
check fails, UniLink annunciates the error and provides a screen for reloading the
customer database.
NOTE: The loading of the customer database erases the ATC database from UniLink
memory. Following a load of the customer database, the ATC database must
be reloaded.
• Air Traffic Control (ATC) Database
Contains screen and message definitions for ATC applications, including the Future Air
Navigation Systems (FANS).
The system provides flexibility in response to the changing communications, navigation,
and surveillance/air traffic management environment for current and future regulations.
This database is used to define the UniLink ATC screens and message sets and is very
similar in function and purpose as the customer database.
A 32-bit CRC is employed to confirm database integrity at loading, initialization, and
during flight. The ATC database also has a version number that is checked upon loading
for compatibility with the application software and the customer database. If the ATC
database CRC check fails, UniLink annunciates the error and allows the user to continue
to access the functions defined by the customer database.
NOTE: Loading the ATC database does not affect the currently loaded customer
database or Geographic database.
• Geographic Database
Contains aircraft communications addressing and reporting system (ACARS) ground
station locations and corresponding ACARS VHF frequency information.
The geographic database has a 32-bit CRC that is verified upon database loading. It also
has a version number that determines its compatibility with the application software. If
the geographic database CRC check fails, UniLink annunciates the error and prevents the
user from operating UniLink with a corrupted database.
NOTE: The Customer, ATC, and Geographic databases can be installed by UASC
and can also be field-loaded using a UASC DTU-100 or SSDTU. It is
recommended that this connection be installed as updates to these databases
may be required from time to time.