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Interface to the PC is the same as MSRD, using a single RS-232
communications port. Lightning and surge protection (transformer isolation)
are built in.
2.1.2.1.2 Data Multiplexer / Switch
Almos RS-232 Multiplexer provides automated server data changeover in the
event of a server failover. This device and the MetConsole interface software
ensure that server failover is performed in the minimum amount of time and
without requiring operator intervention.
Multiplexer Overview
MASTER STATION
COMMUNICATION
SET
(LANDLINE)
MASTER STATION
COMMUNICATION
SET
(RADIO)
WIND
REMOTE
STATION LDL
WIND
REMOTE
STATION LDL
LANDLINE REMOTE STATION
O
WIND
REMOTE
STATION RAD
WIND
REMOTE
STATION RAD
RADIO REMOTE STATION
NETWORK
...
TO MASTER STATION PC
TO MASTER STATION PC
ADDITIONAL
STATIONS
ALMOS
MULTIPLEXER
MCS-RADIO
MCS-LANDLINE
EXTERNAL INTERFACE
EXTERNAL INTERFACE
EXTERNAL INTERFACE
REMOTE SITE SUPPORT
EXTERNAL INTERFACE
PRIMARY
SERVER
SECONDARY
SERVER
TELVENT Low Level Windshear Alert System
Almos
12
LLWAS
Low Level Windshear Alert System
2.1.2.2 Master Station Computer Configuration
The Master Station computers, like all computers used in the Almos LLWAS
MetConsole network, are Intel Pentium architecture PCs operating Windows
Server version of Operating System.
A DVD-ROM is provided standard on all PCs, allowing simple software
installation from an Almos LLWAS MetConsole install DVD. The Almos DVD
installation process is an extremely simple process designed to require a
minimum of operator supervision, making better use of valuable maintenance
engineers’ time.
Soundcards are installed on all PCs for the purpose of providing audible
alarms. LCD displays are offered for all display PCs and include integrated
brightness controls for use in a tower environment. Displays include
integrated speakers for simplified alert volume control and muting.
A high capacity Hard Disk is installed on both server PCs for the purpose of
storing data online.
The choice of the Windows Server operating system follows Almos’
commitment to quality by integrating with high quality, proven operating
systems in the critical aviation environment.
2.1.2.3 Multi-port RS232
Standard Personal Computer architecture limits the PC system to 4 RS-232
ports. Standard Airport systems often require many more ports in order to
cope with the large variety of incoming and outgoing data.
The Moxa Multi-port RS232 controller
attaches to the expansion bus of a
Master Station PC (two are supplied;
one for each Master Station) and
extends the number of ports available
on the PC significantly. These
TELVENT Low Level Windshear Alert System
Almos
13
LLWAS
Low Level Windshear Alert System
controllers are commonly used in high-end airport and meteorological
processing systems.
Each module installed supplies 16 additional high-speed ports; an onboard
RISC processor reduces PC workload allowing more efficient CPU utilization.
The Moxa controllers to be installed will interface to Master Station
Controllers, a modem provided for remote support and other RS232 data
input/outputs.
2.1.2.4 Rack Configuration
Proposed Rack Configuration for the ATC equipment room is as shown
below.
Incoming network cables (through the floor) are
connected to the UTP network hub via a patch
panel. The patch panel allows easy access to
network cabling. The hub is connected to both
server PCs, arranged side by side and clearly
marked “Primary” and “Secondary”.
Both Multi-port Moxa controllers are mounted
above the PCs, and ports from the Moxa
controllers and PC Printer ports are connected
directly to adjacent Serial Multiplexer / Parallel
Multiplexer units. These cables are then run
down through the floor to their various devices.
An intelligent Keyboard, Video & Mouse (KVM)
switch allows the user to switch the system
console screen to display either server’s data.
While the keyboard and mouse are being used
on one server, the KVM switch maintains
communications with the other unit, preventing
loss of signal common to simple switching
devices.
A modem provides dial-up support access and is
software secured (modem hangs up on receipt of
a call and automatically dials a dedicated support number, allowing only
access through the support office).
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