| Distributed Interactive Simulation |
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| CATEGORIES ABOUT DISTRIBUTED INTERACTIVE SIMULATION | |
| ieee standards | |
| nato standardisation agreements | |
| distributed computing | |
| application layer protocols | |
| SHOPPER'S DELIGHT | |
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There was a NATO standardisation agreement ( STANAG 4482, ''Standardised Information Technology Protocols for Distributed Interactive Simulation (DIS)'', adopted in 1995 ) on DIS for modelling and simulation interoperability, but this was also abandoned in favour of HLA as early as 1998 . The first draft HLA STANAG ran afoul of administrative procedures when it changed sponsors within NATO, which forced the process to start all over again at square one —which is why the HLA STANAG (4603) is still at the draft stage. DIS is defined under IEEE Standard 1278:
In addition to the IEEE standards, the Simulation Interoperability Standards Organization (SISO) maintains and publishes an enumerations and bit encoded fields document yearly. This document is referenced by the IEEE standards. The DoD, and in particular the USAF's Distributed Mission Operations Center (''DMOC''), continues to advance the DIS protocol and SISO, a sponsor committee of the IEEE, promulgates improvements in DIS. Contrary to some people's opinions (and desires), DIS is not dead, but is alive and well and working just fine. APPLICATION PROTOCOL Simulation state information is encoded in formatted messages, known as ''Protocol Data Units'' (''PDUs'') and exchanged between hosts using existing Transport Layer protocols, though normally broadcast User Datagram Protocol is used. There are several versions of the DIS application protocol, not only including the formal standards, but also drafts submitted during the standards balloting process.
PROTOCOL DATA UNITS The current version of the DIS application protocol defines 67 different PDU types, arranged into 12 families. Frequently used PDU types are listed below for each family.
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