The results of a series of data communication tests that measured the digital end-to-end performance of the Advanced Communication Technology Satellite (ACTS) are presented. The experiment intended to determine the performance provided to a pair of users who use the satellite as the transmission medium. In order to accomplish this task, the performance parameters defined in the American National Standard X3.102 were measured. Some examples of the X3.102 parameters include Access Time, Access Denial Probability, Bit Error Probability, User Information Transfer Rate, Disengagement Time, and Disengagement Denial Probability. The performance measured is dependent on the type of service offered (e.g., connection-oriented or connectionless, packet size, window size). The services analyzed included narrowband Integrated Services Digital Network (ISDN), X.25, and a dialed circuit-switched connection. For all services, test results showed that ACTS has a very clean data channel (only one lost byte was recorded during all the tests), the Access Time for most services needs to be shorter, and the parameter estimates did not vary substantially over time or destination location.