The TLA5204B is a 136 channel Logic Analyzer. 500 ps timing resolution and 128 Mb record length with simultaneous 125 ps MagniVu timing resolution within each acquisition. A logic analyzer is a type of electronic test equipment that engineers use to capture and display signals from a digital circuit or system. Logic analyzers are useful for measuring data, such as state machine traces, timing diagrams, and protocol decodes
http://www.testequipmenthq.com/datasheets/TEKTRONIX-TLA5204B-Datasheet.pdf