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2.1.1 LLWAS Top Level Description
2.1.1.1 System Overview
Remote Station Network:
The system to be installed at the airport consists of a network of eight WAWS
(Wind-only Automatic Weather Station) units. The number of WAWS
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required at a site is dependent on the results of a site survey, which takes into
account the configuration of the runways, the topography of the desired area
of coverage.
Depending on the form of communication used, this network may consist of a
combination of radio (Model 2100-Z-RAD) or landline (Model 2100-Z-LDL)
WAWS units.
To provide master station communications to the landline and radio networks,
two Master Station Communication Set units are to be installed. A landline
MSCS (2100-Z-MSLL) provides a communications hub for the landline WAWS
units, and a radio MSCS (2100-Z-MSRD) provides a communications hub for
all radio WAWS units.
Because the LLWAS Algorithm is configured only to operate on fixed station
addresses, spare WAWS units can be tested by setting them outside of the
range of the ‘operationally in use’ WAWS network. The stations being tested
can then be queried and run as normal but without any data being used by
the LLWAS calculation or displayed on windshear display workstations.
Master Station:
The master station consists of a dual redundant server configuration (primary
server with hot backup). Serial and Parallel Multiplexers provide
communications channels to whichever server is designated the ‘hot’ server
through a failover process. This redundant system ensures that the system
remains operational even in the case of a server failure.
RS232 threshold wind interfaces and MSCS communications are connected to
the Serial multiplexer.
A keyboard/video/mouse extender allows the monitor keyboard and mouse
that form the system console to access both servers and to be located outside
of the rack if desirable.
The Server computers operate Almos LLWAS MetConsole, and provide a
TCP/IP socket for external interface. A multi-port RS232 controller greatly
extends the I/O communications capabilities of each server PC without
providing any significant extra workload on the PC.
LAN
All computers are connected to a central UTP hub. This hub configuration
ensures that any loss of communication or cable damage on any single system
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does not affect any other system. The hub is mounted close to the server pair
for easy maintenance and inspection of the server connection. A description
of the server and hub hardware is provided in the section describing Rack
Configuration.
A third PC, either installed in the equipment room or a more remote location,
processes data archiving and provides an archive replay facility.
Operator Workstations
Meteorological Workstations shall be located in the Meteorological office and
Meteorological observation room.
LLWAS alert displays shall be installed in the Air Traffic Control Tower.
The number of these workstations may be increased without practical limit.
Using a standard PC running a MetConsole client, these systems provide
display and processing functionality. Because of the network hub
configuration, disconnection (or software/hardware/cable fault) on any PC is
isolated from the remainder of the network and ensures that the tower
process carries on using the remaining systems.
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2.1.1.2 System Diagram
2.1.2 Master Station (MS)
The Almos Master Station consists of two main components: A Master Station
Communications Set (MSCS) providing communications to all remote stations,
and a dual-redundant MetConsole Server Pair providing data processing and
storage.
2.1.2.1 Controller Hardware
2.1.2.1.1 Master Station Communications Set
Two models of MSCS unit are used. 2100-Z-MSRD provides radio
communications with up to 16 Radio WAWS units (2100-Z-RAD) on a single
channel. A single RS-232 communications port provides data
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communications to a MetConsole server PC.
Lightning and surge protection are built in.
Mean Time between Failure (MTBF) for the
MSCS electronics is 40,000 hours. 2100-Z-MSLL
is a landline version providing landline
communications with up to 20 Landline WAWS
units (2100-Z-LDL) on a single telephone cable.
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