This read-write object sets the DE (Discard Eligible) threshold for the logical port; once the combined queue depth of connections mapped to it exceeds this value, incoming frames already marked DE get dropped. An administrator uses this to implement a controlled discard policy that sheds low-priority traffic first when the port becomes congested. For example, setting this threshold below portEgresQDepth ensures DE-marked frames are shed before the port's overall queue fills completely.