Operating Basics
TSG 601 User Manual 21
lowed by 20 low states. This is the lowest frequency possible, given
the data encoding schemes that are specified in the serial digital vid-
eo standards.
The third TSG 601 SDI Checkfield signal is a matrix of the other
two. For a much more complete discussion of SDI Check Fields and
their use, please see SMPTE RP 178 and Tektronix publication
25W-7203-1, “A Guide to Digital Television Systems and Measure-
ments.”