This INTEGER packs several transmit-status bit flags into a single value, including bits indicating a transmit was cancelled, a transmit is currently in operation, a buffer is available to the subchannel, or the subchannel is ready to accept post-transmit operations. An administrator decodes the transmit-in-operation bit specifically to determine whether the subchannel is actively transmitting or has stalled mid-transfer. For example, finding the transmit-in-operation bit set in cnt2sctTxStatus while byte counters aren't advancing suggests this subchannel is hung mid-transmit.