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The inputs and outputs of the DPAS will be aggregate time-division-multiplexed (TDM) signals at the North American standard rate of 1.544 Mb/s and at the European standard rate of 2.048 Mb/s. These groups (or digroups) will contain 64 kb/s voice channels and digital data channels at a variety of rates. The DPAS patching capability permits dedicated, full duplex cross-connection of any channel in any digroup to any other compatible channel whether in the same digroup or another digroup. The test access capability permits any channel or group of channels to be routed to digital test equipment. The information presented in this technical report provides system level guidance for the application of DPAS in the DCS from the transmission network perspective. The technical characteristics of the existing Technical Control Facility (TCF) are described and the transition to digital operations discussed. The technical characteristics of the DPAS are summarized and functional interoperability with existing analog and digital transmission and switching systems is discussed. Criteria for the general application of DPAS are developed which provides guidance for the: location and sizing, interface and interoperability, and network management of DPAS. Based on this guidance, phased application plans are developed for worldwide implementation. These plans are arranged by area (Europe, Westhem, and Pacific) and are attached as appendices to the basic document.
This Defense Communications System Organization (DCSO) Technical Report presents and analyzes selected issued related to the technical integration of the evolving Defense Communications System (DCS). Areas considered are: the introduction of Digital Compression Rate Converters (DCRC), elastic buffer sizing in a plesiochronous DCS, the introduction of the Digital Patch and Access System (DPAS) and the newly developed Telecommunications Service Priority (TSP) system. The report also affirms the need for near-term planning: for control of the Secure Voice System (SVS), for the Integrated Services Digital Network (ISDN) as applied to the DCS, and for Integrated Data System (IDS) survivability and reconstitution. The central theme of the report is that the DCS Systems Integration Office (Code B200) is the focal point to ensure a formal integrated system design and documentation process for the DCS and for coordinating and controlling DCS subsystem design within the overall DCS architecture. Keywords include: Defense Communications System, Technical Integration DCRC, DPAS, ISDN, TSP, IDS, and SVS.
A concept and recommendation for the time-phased deployment of the DPAS Digital Patch and Access System in the DCS-Europe is presented. Three time-phased deployment stages of the DPAS in the various operational configurations are analyzed and evaluated. Forty-odd nodes in the DCS-Europe are recommended for DPAS deployment and the control plans for these nodes are evaluated in accordance with the three time-phased deployment stages. (Author).
The Digital Access and Cross-Connect System (DACS) is communications equipment which provides electronic patching and test access to individual 64 kb/s channels of T1 digital groups (digroups). Equipment such as the DACS is envisioned for use in the Defense Communications System (DCS) where it would interface with existing digital communications equipment such as those developed in the Digital Radio and Multiplexer Acquisition (DRAMA) program. The testing reported herein addressed issues concerning the interfaces and interoperation of the DACS with the DRAMA equipment. Section 2 describes the DACS and the test installation at Scott AFB. The communications techniques used within the equipment are described and various communications terms are defined. Section 3 goes into the test methodology and relates the test configurations to potential application of the equipment in the DCS. Results of the testing are then presented in the remaining sections. Section 4 addresses various functional characteristics of the equipment. Section 5 presents results of interface testing including a characterization of the DACS and the DRAMA digroup interfaces. Section 6 describes testing related to the important topics of synchronization and timing. In Section 7, the performance parameters monitored by the DACS and the DACS alarms are discussed. Section 8 addresses operator interface characteristics of the equipment. Summary findings and conclusions are contained in Section 9. The appendix describes the test equipment employed during the testing.