Ancillary Data
Ancillary data is information such as closed captioning or embedded audio that is included in the non-active video portions of the video signal. These portions include the Horizontal Ancillary Data Space (HANC) and Vertical Ancillary Data Space (VANC).
Important: The switcher does not pass ancillary data. Ancillary data is handled by Ultrix™ and inserted after the switcher. Refer to the documentation
that came with your router for information on ancillary data handling.