review and action. Depending on user requirements,
video display terminal (VDT) operators may be
prevented from displaying or recalling Top Secret and
SPECAT messages. The purpose of this precaution is to
reduce the possibility of a security violation.
Flexibility
The LDMX system eliminates most manual
processing without imposing stringent limitations on
the user. Tailored to meet the unique situations at each
command, the LDMX can be responsive to individual
command requirements and variances.
Statistical and Management Reports
A significant feature of the LDMX system is the
natural accumulation of statistical information and
accounting data. This provides accurate verification of
the reliability and performance of the system. Message-
processing data is summarized in a series of statistical
analysis summaries that include the following:
A bar chart providing an hourly volume of
incoming or outgoing messages;
A summary report showing the number and
average length of incoming or outgoing
messages, the number of messages delivered to a
remote printer, and the number of classifications
and precedences;
A listing of service messages sent and received;
A listing of duplicated, misrouted, and missent
messages; and
A speed-of-service report, giving maximum,
average, and minimum processing times (by
precedence, classification, or selected
originator).
FLEET COMMUNICATIONS SYSTEMS
The systems for afloat units are compatible with
those used ashore. Next, we will discuss the types of
automated systems used afloat.
NAVAL MODULAR AUTOMATED
COMMUNICATIONS SYSTEM
The Naval Modular Automated Communications
System (NAVMACS) is a shipboard message-
processing system developed to meet command
missions. The NAVMACS provides accurate, secure,
and expedient communications for various classes of
ships and flagships. The hardware, software, and
fictional capabilities of the NAVMACS are based on
the needs of individual ships and commands.
The current versions of NAVMACS are (V)1, (V)2,
(V)2-MPD (message-preparation device), (V)3, and
(V)5/(V)5A. NAVMACS capabilities are augmented in
a building-block manner from the most basic system,
(V)1, through the most sophisticated system,
(V)5/(V)5A.
NAVMACS (V)1
The NAVMACS (V)1 configuration provides
automation for the receipt and processing of up to four
channels of incoming broadcast message traffic. This
configuration provides one channel of incoming and
outgoing high-speed satellite link message traffic from
and to the CUDIXS (discussed shortly). The system
incorporates the equipments and computer program
necessary to perform the automatic address screening
and management functions required in the processing of
incomming messages. It also incorporates the storage,
formatting, and accountability functions used in the
ship-to-shore delivery of messages transmitted via
satellite and the shore-to-ship delivery of messages
received via broadcast and satellite.
NAVMACS (V)2
The NAVMACS (V)2 configuration provides the
same message processing and delivery functions used
in the (V)1 configuration for up to four channels of
incoming broadcast message traffic. It provides one
channel of incoming and outgoing high-speed satellite
link message traffic from and to CUDIXS. The
NAVMACS (V)2 configuration upgrades the (V)l
system in the following ways:
Adds automatic MILSTRIP paper tape message
processing;
Adds message output to medium-speed printers
instead of low-speed printers; and
Uses magnetic tape program loading instead of
paper tape loading.
NAVMACS (V)2-MPD
The NAVMACS (V)2-MPD configuration has the
same capabilities as the NAVMACS (V)2 version but
uses a different program for operator language and
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