Response Modes

Both asynchronous disconnect mode (ADM) and asynchronous balanced mode extended (ABME) are supported.

ADM is entered by default whenever a link session is initiated. It switches to ABME only after the set asynchronous balanced mode extended (SABME) packet sequence is complete by way of the DLC_CONTACT command or a remote-initiated SABME packet. Once operating in ABME, information frames containing user data can be transferred. ABME then remains active until the LLC session ends, which occurs because of a disconnect (DISC) packet sequence or a major link error.