Add trailer indicating which bunches were filled
When using zero suppression with Layer-2 data (where there is no bunch counter in the payload per BX) we need a way to signal to the software which BX a given frame came from. The proposed solution would add a 3564 bit trailer indicating which BXs were not zero suppressed in a given orbit.
This may require the addition of a "trailer" signal in addition to (or replacing) the "last" signal currently indicating the last BX in an orbit.