This read-only enumerated value reports the transmit-side status of the channel in the egress direction (outgoing from the switch toward the line), showing whether it's operating normally or actively sending an AIS or FERF alarm indication outward. Admins check this to see whether this card, rather than a remote device, is the source of an alarm being propagated onto the physical line. For example, if a channel shows sendingAis here, it means this card itself has detected a problem and is signaling it outward, which is different from receiving an alarm from elsewhere.