This reflects, and per the description is commanded by, the far-end loopback status, none, line loop, or payload loop, for this DS1 port, as directed by the switch. Because this tracks a loop state at the remote end of the circuit that was commanded from here, it is the object to check to confirm whether a far-end loop this switch requested on this port actually took effect, rather than assuming success just because the command was sent. If this object shows fe-line-loop after commanding a far-end line loop on this port, the remote equipment has confirmed entering that loop and the switch can proceed with the intended test.