This tracks outbound optionally-discard-eligible frames being delivered on this circuit, the delivery-side counterpart to cktInODEFrames, letting the admin see what proportion of traffic reaching the customer falls in that intermediate discard-priority class regardless of which direction it originated from. For example, comparing cktOutODEFrames against cktOutFrames over a busy period tells the admin what fraction of delivered traffic on this circuit is at reduced discard priority and thus at higher risk of having been dropped upstream during congestion.