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This report describes an analysis of air traffic control communication and workload in a simulated terminal radar approach control environment. The objective of this study was to investigate how pilot-to-controller data-link acknowledgment time might affect controller-perceived workload and operational communication. Eight controllers provided air traffic services to simulated arrival aircraft during a moderate-traffic density simulation in which voice radio and data link communications were available. The effect of a delay in downlinked pilot acknowledgment time to controller uplinked messages was the primary variable of interest. Each controller completed the same scenario twice, with the order of presentation counterbalanced. That is, for the first simulation, half the controllers received immediate responses to their data link messages while the other half received pilot acknowledgment time delayed by about 11 seconds. The primary finding was a general, albeit not statistically significant, tendency among controllers towards an increase in subjective workload overall and on individual dimensions of the NASA Task Load Index when the simulation environment supported mixed, rather than immediate pilot responses. The analysis performed on communication measures revealed that controller workload was affected by the communications capability onboard the aircraft but not ghost pilot response type (immediate, delayed). Transmissions to data link-equipped aircraft took longer to complete and contained longer pauses than transmissions to non-data linked aircraft. The mode of communications selected by controllers also influenced workload but ghost pilot response type did not.