The Spectracom Model TPRO-PMC provides high-accuracy timing functions on a plug-in board with a PMC interface. The board has an on-board clock, which is kept in sync to an external timecode input. Several timing functions are derived from the on-board clock, including a programmable periodic pulse rate output (“heartbeat”), a programmable start/stop output (“match”), a selectable frequency output (“oscillator out,” 1kHz, 1, 5, or 10MHz), and a time-stamping input (“time-tag”). The TPRO-PMC obtains time from an input timecode, which can be IRIG-B or IRIG-A format, with the board automatically detecting which format is being used. Timing accuracy is the same regardless of which format is being used. The timecode conveys the day, hour, minute and second. The on-board 10MHz oscillator is disciplined to maintain a 1 microsecond accuracy. An IRIG-B timecode output is provided, which is in-sync with the incoming timecode. The TPRO-PMC may be used as a stand-alone timecode generator. The computer programs the day, hour, minute and second. The board then continues to count from that time, using the on-board oscillator as the timebase reference. This is called “freewheeling.”
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