Sony PMW-F55 Operating Instructions Manual page 8

Various input/output connectors
Four types of SDI output
The camcorder has four types of SDI output that
allows you to output 4K 59.94P signal as four 3G-
SDI.
The SDI-1/2 and SDI-3/4 outputs are assignable
as SDI-1/2 OUT to Main, and SDI-3/4 OUT to
Sub.
The camcorder also includes connections for
Genlock IN, Timecode IN/OUT, HDMI OUT,
Remote.
8 Features