Abstract: Every EOS satellite needs to down-link imagery (telemetry) and receive daily mission planning updates (commands). As image resolution has increased, down-link data rates and the required hardware to support the link functions have increased. A system design of a compact Integrated Command and Telemetry Subsystem is presented that deviates from this growth trend. The proposed system design is based on a modular packaging concept that offers high performance in a small (SEM-C) package. The design allows the modulation scheme, data compression approach, encryption, and image sensor interface to be tailored or changed by replacement modules. The design also features extensive use of built in test that helps to rapidly isolate anomalous operation both in test and on orbit. A discussion of how the method of modulation and data compression effects the efficiency of the link is presented. !6
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