International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / A PC-based space channel error simulator that includes differing forward and return data links, independent statistical characterization of the data links, and link propagation delay has been developed. The LabVIEW programming language has been used to configure this containing all of the error generation and processing in software. The simulator is used for testing networking protocols in a simulated space channel environment and can be used for other types of channels as well. This paper describes the design goals, hardware configuration, software, and testing of the simulator. This technique allows for rapid development and validation of the simulator.