DIS - Distributed Interactive Simulation
DIS, or Distributed Interactive Simulation, is a standard networking protocol for exchanging information among various simulation applications. It defines a set of Protocol Data Units, or PDUs, for publishing Entity State information, Fire and Detonate events, Logistics information, Emissions and Communications data, and more. The DIS protocol was defined through an open standards development process, with participation by government, industry, and academia.
The DIS protocol first became an IEEE Standard in 1995, under the official name IEEE 1278.1-1995. In 1998, an addendum to the DIS Standard was published, expanding DIS to include new PDUs for Aggregates, Environmental Features, Minefield, and more. The addendum is also an IEEE Standard, known as IEEE 1278.1a-1998. Since IEEE owns the copyright on the DIS Standard, copies of the Standard may be obtained only from IEEE. The IEEE product code for IEEE 1278.1-1995 is SH94351, while the product code for 1278.1A-1998 is SH94604.
While the IEEE DIS Standards contain all of the information about the structure of the various DIS PDUs, the values for the various DIS enumerations were deemed too dynamic, or fast-changing to include in a slow-changing IEEE Standard. For example, new weapons systems are introduced from time to time, new radio encodings are developed, and even names of countries can change. For this reason, these values and enumerations are maintained by the Simulation Interoperability Standards Organization (SISO) in a separate document called Enumeration and Bit Encoded Values for Use with Protocols for Distributed Interactive Simulation Applications. This document is available from the SISO web site. As of early 2006, the URL for the most recent version can be downloaded from the SISO website.