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This study analyzes the DCS digital transmission system and requirements; defines the wideband digital (CPMAS) Communications Performance Monitoring and Assessment requirements; defines and evaluates CPMAS alternatives; recommends a wideband digital CPMAS approach; makes recommendations for the ATEC production; sets up a plan to demonstrate feasibility of wideband digital CPMAS approach (option phase), and makes recommendations for ATEC research and development programs. The Digital Transmission System Model provides multi-link routes, a variety of station types (e.g., nodal station, branching repeater station and terminal station) transmission equipments (e.g., Radio, Key Generator, Multiplexers, Submultiplexers and service channel multiplexers), and terminations (e.g., 4 kHz (PCM derived), async digital channels, digital groups, and 16 kb/s digital subchannels). The radios used for digital transmission include DRAMA-TI-4000 multiplexer baseband section (FKV).