Editing Serial digital interface (section)

===EDH===
As the standard definition interface carries no checksum, CRC, or other [[data integrity]] check, an '''EDH''' ([[Error Detection and Handling]]) packet may be optionally placed in the vertical interval of the video signal. This packet includes CRC values for both the active picture, and the entire field (excluding those lines at which switching may occur, and which should contain no useful data); equipment can compute their own CRC and compare it with the received CRC in order to detect errors.

EDH is typically only used with the standard definition interface; the presence of CRC words in the HD interface make EDH packets unnecessary.