Ensemble Designs 9430 Flexible Matrix Router for 3G / HD / SD / ASI - Manual (Page 71)

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Avenue 9430 Flexible Matrix Router Installation, Configuration and Operations Guide
Note on Frame Rates
Despite the large number of video formats supported by the Router, there are only three possible
frame rate families.
50 Hz The 50 Hz frame rate family includes 25 Hz and 50 Hz frame and field rates.
This family includes all of the “PAL” related standards in both standard and
high definition.
59.94 Hz All of the NTSC-derived standards, including 23.98, 29.97, and 59.94 Hz
field and frame rates. There is a 4 Frame to 5 Frame relationship between
23.98 and 59.94 which allows these to peacefully co-exist.
60 Hz The “not quite 60 Hz” challenges of the 59.94 world are addressed with this
family which includes 24 Hz, 30 Hz, and 60 Hz field and frame rates. Though
not used for broadcast, this family is useful for film rate and scientific/
industrial applications.
The vast majority of applications, even those including both SD and HD formats, will all fall within a
single frame rate family. For example, as members of the 59.94 family, both SD 525 and 1080i/59.94
can be simultaneously vertically locked to a single reference.