• AUTOMATIC COMPUTER DATA BASE ENTRY AND SETUP OF A DECOMMUTATION SYSTEM

      Rogers, M. Kimberley; Lamb, Gina L.; Ashmore, James H.; Schuh, Richard A.; General Dynamics Convair Division; Loral Instrumentation (International Foundation for Telemetering, 1986-10)
      This paper presents a method developed to automate the data base entry and setup of the ADS 100 Decommutation System. Automation was accomplished by interfacing an existing RS-232C port with a VAX computer. Other available interface options are considered. The automated system provides a method for rapid data entry while minimizing errors. Automation also eliminates the continuing requirement for a skilled ADS 100 programmer. Additional topics reviewed are the various problems encountered while developing the interface. Also discussed is the development and interface of host computer software, including the predefined ADS 100 record structures. The final result is a complete and accurate digital data base setup in the ADS 100 system.
    • DECOMMUTATION OF ASYNCHRONOUS EMBEDDED DATA STREAMS

      Smith, Kevin; Windingland, Kim L.; General Dynamics Convair Division; Loral Instrumentation (International Foundation for Telemetering, 1986-10)
      Due to the increasing complexity of systems on which telemetry is used, the method of embedding a data stream within the main PCM data stream is becoming a popular means of acquiring subsystem data. However, this technique increases the complexity of the decommutating requirement in that the embedded stream must first be extracted from the main stream and then decommutated. One obvious solution would be to re-serialize the extracted data stream to be decommutated by a second set of frame and subframe synchronizers. This method suffers from increased system cost due to the additional hardware needed solely to support the embedded data stream. This paper will address an alternate method developed by Loral Instrumentation and an actual application at General Dynamics, Convair Division. This technique decommutates asynchronous embedded data streams via standard algorithms in a data compressor.