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PROCESSING OUTGOING MESSAGES

Outgoing messages are those messages originated by:

l The command;

l Commands served by the communications center;

l An afloat command if a flag officer is embarked;

l An addressable unit onboard the ship as well as all messages accepted for relay.

The flow chart in figure 2-7 shows the actions required to process outgoing messages.

HANDLING AUTOMATICALLY PROCESSED OUTGOING MESSAGES

Those messages introduced into the LDMX/NAVCOMPARS from a PCMT, VDT, paper tape reader, data speed reader (DSR), card reader, or magnetic tape are considered "outgoing." They are prepared in JANAP 128, modified ACP 126, or other acceptable formats. Most outgoing messages are destined to be delivered to distant communications centers and commands. Others also have delivery requirements for in-house distribution to commands

Figure 2-7.-Steps for processing outgoing messages.

serviced by the communications center. The basic steps for processing outgoing messages are shown in figure 2-8.

The system recognizes whichever format is used upon entry and then validates the start-of-message and end-of-message. After validation, the system outputs either an accept or a reject notice to the operator via the outgoing log. Together with the action notice, the system then outputs a unique header line to identify the message. Accepted messages are assigned a Process Sequence Number (PSN), which is included in the accept notice. They are then stored on diskette for recovery purposes and queued for processing on a first-in, first-out basis by precedence order.

Emergency command or FLASH precedence messages cause any lower precedence messages to be interrupted and a cancel transmission (bust) sequence to be transmitted. The emergency command or FLASH message is transmitted, and normal message processing by precedence is resumed.

Messages are selected for processing based on their precedence and on the order they arrived into the

system; first ones in are the first ones processed out. The LDMX/NAVCOMPARS validates the message header and assigns routing indicators (RIs) for delivery as required.

If the system cannot assign an RI automatically, it will display the addressee line to the router VDT. The router may assign the correct RI, place the message on a queue, reject the message from further processing, or correct the short title of the addressee if in error.

A system status containing accounting information pertinent to all the messages on a hold queue will be displayed to the router via the VDT, when the router queue is empty or upon demand by the operator. The router can then retrieve any message on the hold queue by its PSN. If the router rejects the message, the system will record it and print a reject notice on the service log.

Any message determined by the LDMX/ NAVCOMPARS system to be duplicated will be rejected to the service printer with the proper annotation.

After all routing is appended to the message, the system assigns the language and media format (LMF)

Figure 2-8.-Steps for processing automatic outgoing messages.

(JANAP 128), content indicator code (CIC) (JANAP 128), originating station routing indicator (OSRI), station serial number (SSN), and time of file (TOF) to the message. The message is then paged and sectioned according to JANAP 128, and queued for transmission.

Data-pattern messages may be introduced into the system via card or magnetic tape. The format will be in accordance with JANAP 128 procedures for data messages. During the message preparation, processing, transmission, and filing, the same controls and restraints used for narrative message processing will also apply to data-pattern messages.

The message may also have delivery requirements for distribution to commands serviced by the communications center. The system will automatically assign internal message distribution for all guard commands. If the system cannot provide internal distribution, the message will be displayed to the inrouter for assistance.







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