The DBS-140U combines the functions of a bit synchronizer, data decommutator, and simulator into a USB 2.0 peripheral. Bit synchronizer functionality provides full-featured clock reconstruction, data recovery and code conversion. Recovered PCM data and clock are routed to a data decommutator, bit error rate tester, and output multiplexer. The data decommutator provides full IRIG frame synchronization and data decommutation at rates up to 40 Mbps.