NAVAL COMMUNICATIONS PROCESSING AND ROUTING SYSTEM The   Naval   Communications   Processing   and Routing  System  (NAVCOMPARS)  is  an  automated system that serves as the interface between AUTODIN or other networks ashore and operational units of the Navy. There are five NAVCOMPARS sites: NCTAMS EASTPAC,  NCTAMS  WESTPAC,  NCTAMS    MED, NCTAMS  LANT,  and  NAVCOMMTELSTA  Stockton, California. The primary purpose of NAVCOMPARS is to provide  security, speed, and systems  compatibility for the Naval Telecommunications System (NTS). The NAVCOMPARS  system  provides  the  following services: On-line   communications   with   AUTODIN switching centers; On-line  communications  with  tactical  and dedicated circuits; Off-line communications interface capabilities; Processing of JANAP 128-formatted messages; Conversion  of  DD  Form  173  messages  to JANAP 128 format; Conversion of modified ACP 126-formatted messages to JANAP 128 format; Filing,   retrieving,   and   accountability   of messages; Local delivery analysis; Distribution assignment; Message  store-and-forward  capability  to  fleet units; Fleet support through broadcast management or full-period terminations and primary ship-shore circuits; Broadcast keying and screening; On-line  communications  with  the  Worldwide Military   Command   and   Control   System (WWMCCS);  and On-line  communications  with  Common  User Digital   Information   Exchange   System (CUDIXS)  and  Remote  Information  Exchange Terminals   (RIXTs).   (CUDIXS   and   RIXT systems are discussed later.) Automation  of  these  functions  and  services eliminates manual processing and minimizes related delays   and   errors.      Automation   also   improves originator-to-addressee delivery time and allows the timely exchange of information critical to the command and control of forces afloat. LOCAL DIGITAL MESSAGE EXCHANGE The  Local  Digital  Message  Exchange  (LDMX) provides automatic outgoing message routing and reformatting   for   Navy   activities   ashore.   It simultaneously  transmits and receives messages over the AUTODIN and other remote terminal circuits. The LDMX  system  provides  high-speed  processing,  system reliability,    secure    communications,    flexibility, statistical information, and accounting data. High-Speed Processing The   LDMX   system   provides   high-speed communications  processing.  On-line  to  AUTODIN  and other  circuits,  the  LDMX  system  automatically receives, identifies, and files traffic for processing and future reference. Incoming messages are automatically arranged by precedence; then processed, edited, and printed on reproducible mats for delivery. Outgoing traffic is entered by magnetic or paper tape.  The  system  formats  the  outgoing  message,  creates a  header,  and  validates  the  message  identifiers, precedence,  and  classification.  The  LDMX  system  also searches system files to assign the correct routing indicator and arranges the message by precedence for automatic transmission. Operating at full capacity, the system can process up to 7,500 messages per day. System Reliability Message-processing  reliability  has  been  greatly improved by automatic message identification and header preparation and by system look-up files instead of manual files.  The elimination of most manual functions  and  validation  of  those  remaining  greatly reduce  misroutes  and  nondeliveries.    The  system continues to operate in either a semiautomatic or manual   mode   if   a   major   component   becomes inoperable. Secure Communications All message security fields are validated. If a mismatch is detected in the LDMX system, the message will be displayed to an inrouter or an outrouter for 1-13