This read-only value reports the current insertion state of the Trunk Coupling Unit (TCU) on backplane Ring A for the module in a slot: inserted, wrapped, or notTR if the card isn't a Token Ring linecard. An admin checks this to confirm a Token Ring card is actually inserted onto Ring A rather than wrapped (bypassed) out of the ring, which would mean it's not passing ring traffic. For example, a value of wrapped(2) on a card expected to be active tells the admin that card has been isolated from Ring A and needs reseating or replacement.