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mouse pointer over most controls will display a label with information about
the control or the item of data being displayed.
Example of tool tips
Pressing F1 will bring a context sensitive Windows Help file with help, tips,
and guidance and specific tasks.
Extensive on-line help is available
TELVENT Low Level Windshear Alert System
Almos
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LLWAS
Low Level Windshear Alert System
Right clicking on any variable brings up more information about the point
including details about any fault status.
2.1.11.1.2 Alarms and Events
The system monitors all incoming weather variables and can detect a variety
of faults in the data stream. Data faults include:
• Primary/Secondary Server Failure.
• Communications faults.
• Sensor faults.
• Missing data.
• Value too high or too low.
• Value higher or lower than airport operating maxima.
• Value jumping too rapidly from value to value
• Value “frozen” within a small range of value.
Acceptable ranges can be set arbitrarily on any point. And any test can be
omitted. As alarms occur they are printed on the system printer, stored in the
Windows NT event log, stored in a database file, and if the alarm or event
requires acknowledgment is placed in an alarm list in a toolbar the server.
The current alarm list is displayed in a toolbar.
2.1.11.1.3 Technicians functions
There are a number of trouble shooting screens built in to the system to
assist technicians. The “Technical Reference Manual” provides
descriptions of how to use these screens.
TELVENT Low Level Windshear Alert System
Almos
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LLWAS
Low Level Windshear Alert System
Terminal data for sensor interface
2.1.11.1.4 GPS Time Sync
Our time synchronisation system reads the external time messages and
compares the time to the server’s clock. If the time is inaccurate then the
software will:
1. Remove or insert milliseconds off each tick of the clock until the PC time
matches the external clock, and the server becomes in sync.
2. Compute the exact inaccuracy of the PC clock compared to the reference,
and then remove or insert milliseconds from each clock tick to proactively
ensure that the time remains in sync.
Because we are always making minor changes to the time there cannot be
“jumps” in the data set caused by the time changing rapidly. The unique
proactive correction of the PC clock ensures that accuracy is maintained even
if the time source is lost for an extended period of time.
The time setting functions provide a facility for entering the time in the
absence of an external time source. These allow the user to enter the time
on the primary server; the time is simultaneously broadcast across the
network, with each PC updating its time as required.
TELVENT Low Level Windshear Alert System
Almos
42
LLWAS
Low Level Windshear Alert System
All system functions are timed relative to the server’s PC clock, and all other
PCs time is set to match the server’s time. Each master station computer is
fitted with a removable, rechargeable battery backup on the internal clock,
ensuring maximized lifetime on the real-time clock components.
2.1.11.1.5 Watchdog
Almos supplies watchdog hardware that monitors all system operations. An
independent hardware card installed in the machine monitors the MetConsole
software. In the event of any failure of hardware, operating system, or the
application program, (which prevents normal operation) the PC is completely
reset. This substantially reduces the number of fault callouts and significantly
improves the MTTR.
2.1.11.1.6 Remote Access
We provide a remote dial in server utilising Microsoft Remote Access Service
(RAS). This facility permits access to monitoring and diagnostics of the system
by Almos. This port can also be used for centralised monitoring of the system.
This can also be used to remotely upgrade or reconfigure the system. Of
course this feature is password protected and can be enabled and disabled as
required.
2.1.11.2 Built–In Test Equipment - BITE
In an airport environment, due to the requirements to keep repair and
downtime to the absolute minimum, an automatic failure detection and
isolation system referred to as built-in-test equipment (BITE) is implemented
on all equipment. BITE functions are primarily performed by software
resources.
The primary objective of BITE is to correctly detect system malfunctions and
accurately fault-isolate to a single replaceable unit so that maintenance staff
with a minimum of training are able to perform this function. Failures
　
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