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IEEE 1278.2-2015 pdf free

IEEE 1278.2-2015 pdf free.IEEE Standard for Distributed Interactive Simulation (DIS)-Communication Services and Profiles.
Class 1 service is a mode of operation where PDUs are issued with a one-to-many address mechanism that allows the PDU to be sent once and received by multiple host computers simultaneously. This shall be achieved either by broadcast or multicast addressing. This service class shall add no mechanisms for reliability except those inherent in the underlying service.
Broadcast addressing. the minimal form of best-effort multicast serviees to support DIS communication service, shall consit of simultaneous transmittals to a group consisting of all host computers ona LAN.
NOTE- PDUs addressed with broadcast do not typically pass through routers so it is limited to simple LAN topologies. Gateways are required to convert broadcast addressing into either multicast or unicast to allow more complex network topologies.
Multicast addressing, a more general form of addressing. shall allow one-to-many communication to a group that is a subset of all host computers and shall allow individual simulation applications to join a group of interest. Multicast addressing should be supported by all simulation applications.
For networks employing multicast service beyond the minimal broadcast form, the following services shall be required to support DIS:
a) A multicast addressing group shall be able to include members anywhere on the network.
b) The maximum number of members in a single multicast group shall be large enough to encompass all host computers within the DIS system supported by the multicast network.
c) The multicast service shall have the capability to support multiple, independent exercises sharing the same networks.
Class 2 service is a mode of operation where the service provider shall use no added mechanisms for reliability except those inherent in the underlying service. PDUs using Class 2 service shall use individual addressing, implying a one-to-one form of communication. A PDU shall be issued multiple times if there is more than one simulation application that is required to receive it.
Class 3 service is a mode of operation where the unicast service provider shall use whatever mechanisms are available to help ensure that the PDUs are delivered in their original sequence with no duplications, no missing PDUs, and no detected errors. Like Class 2, the PDU shall be issued using individual addressing.IEEE 1278.2 pdf download.

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