Both PDF and XML versions are available. Current status SISO, a sponsor committee of the IEEE, promulgates improvements in DIS. Major changes occurred in the DIS 7 update to IEEE 1278.1 to make DIS more extensible, efficient and to support the simulation of more real world capabilities. 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, including multicast, though broadcast User Datagram Protocol is also supported. There are several versions of the DIS application protocol, not only including the formal standards, but also drafts submitted during the standards balloting process. Version 1 - Standard for Distributed Interactive Simulation - Application Protocols, Version 1.0 Draft (1992) Version 2 - IEEE 1278-1993 Version 3 - Standard for Distributed Interactive Simulation - Application Protocols, Version 2.0 Third Draft (May 1993) Version 4 - Standard for Distributed Interactive Simulation - Application Protocols, Version 2.0 Fourth Draft (March 1994) Version 5 - IEEE 1278.1-1995 Version 6 - IEEE 1278.1a-1998 (amendment to IEEE 1278.1-1995) Version 7 - IEEE 1278.1-2012 (See External Link - DIS Product Development Group.) Version 7 is also called DIS 7. This is a major upgrade to DIS to enhance extensibility and flexibility. It provides extensive clarification and more details of requirements, and adds some higher-fidelity mission capabilities. Protocol data units The current version (DIS 7) defines 72 different PDU types, arranged into 13 families. Frequently used PDU types are listed below for each family. PDU and family names shown in italics are found in DIS 7. Entity information/interaction family - Entity State, Collision, Collision-Elastic, Entity State Update, Attribute Warfare family - Fire, Detonation, Directed Energy Fire, Entity Damage Status Logistics family - Service Request, Resupply Offer, Resupply Received, Resupply Cancel, Repair Complete, Repair Response Simulation management family - Start/Resume, Stop/Freeze, Acknowledge Distributed emission regeneration family - Designator, Electromagnetic Emission, IFF/ATC/NAVAIDS, Underwater Acoustic, Supplemental Emission/Entity State (SEES) Radio communications family - Transmitter, Signal, Receiver, Intercom Signal, Intercom Control Entity management family Minefield family Synthetic environment family Simulation management with reliability family Live entity family Non-real time family Information Operations family - Information Operations Action, Information Operations Report Realtime Platform Reference FOM ("RPR FOM") The RPR FOM is a Federation Object Model (FOM) for the High-Level Architecture designed to organize the PDUs of DIS into an HLA object class and interaction class hierarchy. It has been developed as