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The primary function of the record and playback subsystem is to record unprocessed space shuttle instrumentation data during tests and launch countdowns. These recordings can then be played back for posttest analysis when firing room personnel are troubleshooting space shuttle or LPS problems. The subsystem consists of instrumentation tape recorders, telemetry demultiplexing equipment, direct-write recorders, and computers to provide data-reduction capabilities. The subsystem also provides certain functions in support of the CCMS and CDS portions of the LPS. These include the playback of data from downrange instrumentation tapes sent to KSC for data analysis by systems engineers.