Rosendahl mif 4 - Manual (Page 5)

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3. LTC input mode
LTC is longitudinal timecode according SMPTE 12M, there are 80
bits containing time, userdata and a syncword.
The unit detects the incoming LTC frame format automatically.
The FPS LEDs 24, 25, 30 and DF indicate the detected format.
24 FPS timecode is used for movie productions.
25 FPS timecode is the standard European video frame rate but is
also common for European audio productions.
30 FPS timecode is used for audio and high definition video
productions in Japan and the US.
30 FPS pull down resulting in 29.97 FPS is used for NTSC or high
definition video productions (pull down).
30 and DF indicates the drop frame format used only for pull down
video applications where correlation to time of day is mandatory.
These LEDs are all unlighted if no input signal is applied, so they
also serve to indicate ISP (Input Signal Present) status.
Continious timecode, running forward, within +/- 6% of nominal
speed will be translated into MTC timecode and sent to the MIDI and
USB output ports. Simultaneously stable, regenerated LTC is fed to
the LTC output.
I.e. 29.97 FPS non drop timecode is 30 FPS timecode running 0.1%
slower (defined as 1000/1001 pull down rate) and within the 6%
window.
The timecode speed is displayed in the DISPLAY mode CAL.
1.0000 indicates timecode running at nominal speed.
29.97 FPS non drop timecode will be displayed as 30 FPS running at
0.9990.
29.97 DF drop frame timecode is indicated by
LED 30 and LED DF with a calibration factor CAL 0.9990
23.98 FPS is indicated by LED 24 and a calibration factor 0.9990.