This paper describes the AFETR Real-Time Telemetry Data System and identifies the data transmission limitations from the various stations. The manner in which the system is implemented so as to select and merge data from multiple asynchronous sources and to obtain an efficient retransmission format is described. The features of the various operational data handling modes are discussed. Finally, the features of the initial system are tabulated, and areas where increased capability is possible simply by adding additional units are identified.