Dolby E Guard Band
Dolby E line position (guard band placement) is a small section of null data, as part of the bit stream, to act as a buffer to avoid frame and CRC errors. The measurement of where the guard band ends and the SMPTE 337M Dolby E data burst starts is often called the "line position." This relates to a specific video line to which the start of the Dolby E data burst is aligned.
There is a setting in SurCode for Dolby E Encoder that, when enabled, dynamically calculates and injects the correct Dolby E line position into the encoded bit stream: “Prepend guard band to encoded file.”